author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 58242 | 94bb65cb37d3 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
52427
diff
changeset
|
2 |
* Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
|
5 |
* This code is free software; you can redistribute it and/or modify it |
|
6 |
* under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
* accompanied this code). |
|
16 |
* |
|
17 |
* You should have received a copy of the GNU General Public License version |
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
* |
|
5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
|
23 |
* questions. |
|
2 | 24 |
*/ |
25 |
||
26 |
package java.util; |
|
16867 | 27 |
|
2 | 28 |
import java.io.*; |
16867 | 29 |
import java.util.function.BiConsumer; |
30 |
import java.util.function.Function; |
|
31 |
import java.util.function.BiFunction; |
|
52427
3c6aa484536c
8211122: Reduce the number of internal classes made accessible to jdk.unsupported
mchung
parents:
49774
diff
changeset
|
32 |
import jdk.internal.access.SharedSecrets; |
2 | 33 |
|
34 |
/** |
|
56
48451b4616e8
5080227: (coll spec) Bug in documentation for WeakHashMap
martin
parents:
2
diff
changeset
|
35 |
* This class implements a hash table, which maps keys to values. Any |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
36 |
* non-{@code null} object can be used as a key or as a value. <p> |
2 | 37 |
* |
38 |
* To successfully store and retrieve objects from a hashtable, the |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
39 |
* objects used as keys must implement the {@code hashCode} |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
40 |
* method and the {@code equals} method. <p> |
2 | 41 |
* |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
42 |
* An instance of {@code Hashtable} has two parameters that affect its |
2 | 43 |
* performance: <i>initial capacity</i> and <i>load factor</i>. The |
44 |
* <i>capacity</i> is the number of <i>buckets</i> in the hash table, and the |
|
45 |
* <i>initial capacity</i> is simply the capacity at the time the hash table |
|
46 |
* is created. Note that the hash table is <i>open</i>: in the case of a "hash |
|
47 |
* collision", a single bucket stores multiple entries, which must be searched |
|
48 |
* sequentially. The <i>load factor</i> is a measure of how full the hash |
|
49 |
* table is allowed to get before its capacity is automatically increased. |
|
50 |
* The initial capacity and load factor parameters are merely hints to |
|
51 |
* the implementation. The exact details as to when and whether the rehash |
|
52 |
* method is invoked are implementation-dependent.<p> |
|
53 |
* |
|
54 |
* Generally, the default load factor (.75) offers a good tradeoff between |
|
55 |
* time and space costs. Higher values decrease the space overhead but |
|
56 |
* increase the time cost to look up an entry (which is reflected in most |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
57 |
* {@code Hashtable} operations, including {@code get} and {@code put}).<p> |
2 | 58 |
* |
59 |
* The initial capacity controls a tradeoff between wasted space and the |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
60 |
* need for {@code rehash} operations, which are time-consuming. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
61 |
* No {@code rehash} operations will <i>ever</i> occur if the initial |
2 | 62 |
* capacity is greater than the maximum number of entries the |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
63 |
* {@code Hashtable} will contain divided by its load factor. However, |
2 | 64 |
* setting the initial capacity too high can waste space.<p> |
65 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
66 |
* If many entries are to be made into a {@code Hashtable}, |
2 | 67 |
* creating it with a sufficiently large capacity may allow the |
68 |
* entries to be inserted more efficiently than letting it perform |
|
69 |
* automatic rehashing as needed to grow the table. <p> |
|
70 |
* |
|
71 |
* This example creates a hashtable of numbers. It uses the names of |
|
72 |
* the numbers as keys: |
|
73 |
* <pre> {@code |
|
74 |
* Hashtable<String, Integer> numbers |
|
75 |
* = new Hashtable<String, Integer>(); |
|
76 |
* numbers.put("one", 1); |
|
77 |
* numbers.put("two", 2); |
|
78 |
* numbers.put("three", 3);}</pre> |
|
79 |
* |
|
80 |
* <p>To retrieve a number, use the following code: |
|
81 |
* <pre> {@code |
|
82 |
* Integer n = numbers.get("two"); |
|
83 |
* if (n != null) { |
|
84 |
* System.out.println("two = " + n); |
|
85 |
* }}</pre> |
|
86 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
87 |
* <p>The iterators returned by the {@code iterator} method of the collections |
2 | 88 |
* returned by all of this class's "collection view methods" are |
89 |
* <em>fail-fast</em>: if the Hashtable is structurally modified at any time |
|
90 |
* after the iterator is created, in any way except through the iterator's own |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
91 |
* {@code remove} method, the iterator will throw a {@link |
2 | 92 |
* ConcurrentModificationException}. Thus, in the face of concurrent |
93 |
* modification, the iterator fails quickly and cleanly, rather than risking |
|
94 |
* arbitrary, non-deterministic behavior at an undetermined time in the future. |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
95 |
* The Enumerations returned by Hashtable's {@link #keys keys} and |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
96 |
* {@link #elements elements} methods are <em>not</em> fail-fast; if the |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
97 |
* Hashtable is structurally modified at any time after the enumeration is |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
98 |
* created then the results of enumerating are undefined. |
2 | 99 |
* |
100 |
* <p>Note that the fail-fast behavior of an iterator cannot be guaranteed |
|
101 |
* as it is, generally speaking, impossible to make any hard guarantees in the |
|
102 |
* presence of unsynchronized concurrent modification. Fail-fast iterators |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
103 |
* throw {@code ConcurrentModificationException} on a best-effort basis. |
2 | 104 |
* Therefore, it would be wrong to write a program that depended on this |
105 |
* exception for its correctness: <i>the fail-fast behavior of iterators |
|
106 |
* should be used only to detect bugs.</i> |
|
107 |
* |
|
108 |
* <p>As of the Java 2 platform v1.2, this class was retrofitted to |
|
109 |
* implement the {@link Map} interface, making it a member of the |
|
49433
b6671a111395
8199465: {@docRoot} references need to be updated to reflect new module/package structure
jjg
parents:
47423
diff
changeset
|
110 |
* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework"> |
64
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
111 |
* |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
112 |
* Java Collections Framework</a>. Unlike the new collection |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
113 |
* implementations, {@code Hashtable} is synchronized. If a |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
114 |
* thread-safe implementation is not needed, it is recommended to use |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
115 |
* {@link HashMap} in place of {@code Hashtable}. If a thread-safe |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
116 |
* highly-concurrent implementation is desired, then it is recommended |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
117 |
* to use {@link java.util.concurrent.ConcurrentHashMap} in place of |
3244b8bab101
6583872: (coll) Direct uninformed users away from Vector/Hashtable
martin
parents:
56
diff
changeset
|
118 |
* {@code Hashtable}. |
2 | 119 |
* |
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
120 |
* @param <K> the type of keys maintained by this map |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
121 |
* @param <V> the type of mapped values |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
122 |
* |
2 | 123 |
* @author Arthur van Hoff |
124 |
* @author Josh Bloch |
|
125 |
* @author Neal Gafter |
|
126 |
* @see Object#equals(java.lang.Object) |
|
127 |
* @see Object#hashCode() |
|
128 |
* @see Hashtable#rehash() |
|
129 |
* @see Collection |
|
130 |
* @see Map |
|
131 |
* @see HashMap |
|
132 |
* @see TreeMap |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
24255
diff
changeset
|
133 |
* @since 1.0 |
2 | 134 |
*/ |
135 |
public class Hashtable<K,V> |
|
136 |
extends Dictionary<K,V> |
|
137 |
implements Map<K,V>, Cloneable, java.io.Serializable { |
|
138 |
||
139 |
/** |
|
140 |
* The hash table data. |
|
141 |
*/ |
|
12448 | 142 |
private transient Entry<?,?>[] table; |
2 | 143 |
|
144 |
/** |
|
145 |
* The total number of entries in the hash table. |
|
146 |
*/ |
|
147 |
private transient int count; |
|
148 |
||
149 |
/** |
|
150 |
* The table is rehashed when its size exceeds this threshold. (The |
|
151 |
* value of this field is (int)(capacity * loadFactor).) |
|
152 |
* |
|
153 |
* @serial |
|
154 |
*/ |
|
155 |
private int threshold; |
|
156 |
||
157 |
/** |
|
158 |
* The load factor for the hashtable. |
|
159 |
* |
|
160 |
* @serial |
|
161 |
*/ |
|
162 |
private float loadFactor; |
|
163 |
||
164 |
/** |
|
165 |
* The number of times this Hashtable has been structurally modified |
|
166 |
* Structural modifications are those that change the number of entries in |
|
167 |
* the Hashtable or otherwise modify its internal structure (e.g., |
|
168 |
* rehash). This field is used to make iterators on Collection-views of |
|
169 |
* the Hashtable fail-fast. (See ConcurrentModificationException). |
|
170 |
*/ |
|
171 |
private transient int modCount = 0; |
|
172 |
||
173 |
/** use serialVersionUID from JDK 1.0.2 for interoperability */ |
|
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
52427
diff
changeset
|
174 |
@java.io.Serial |
2 | 175 |
private static final long serialVersionUID = 1421746759512286392L; |
176 |
||
177 |
/** |
|
178 |
* Constructs a new, empty hashtable with the specified initial |
|
179 |
* capacity and the specified load factor. |
|
180 |
* |
|
181 |
* @param initialCapacity the initial capacity of the hashtable. |
|
182 |
* @param loadFactor the load factor of the hashtable. |
|
58242
94bb65cb37d3
8230648: Replace @exception tag with @throws in java.base
jboes
parents:
57956
diff
changeset
|
183 |
* @throws IllegalArgumentException if the initial capacity is less |
2 | 184 |
* than zero, or if the load factor is nonpositive. |
185 |
*/ |
|
186 |
public Hashtable(int initialCapacity, float loadFactor) { |
|
187 |
if (initialCapacity < 0) |
|
188 |
throw new IllegalArgumentException("Illegal Capacity: "+ |
|
189 |
initialCapacity); |
|
190 |
if (loadFactor <= 0 || Float.isNaN(loadFactor)) |
|
191 |
throw new IllegalArgumentException("Illegal Load: "+loadFactor); |
|
192 |
||
193 |
if (initialCapacity==0) |
|
194 |
initialCapacity = 1; |
|
195 |
this.loadFactor = loadFactor; |
|
12448 | 196 |
table = new Entry<?,?>[initialCapacity]; |
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
197 |
threshold = (int)Math.min(initialCapacity * loadFactor, MAX_ARRAY_SIZE + 1); |
2 | 198 |
} |
199 |
||
200 |
/** |
|
201 |
* Constructs a new, empty hashtable with the specified initial capacity |
|
202 |
* and default load factor (0.75). |
|
203 |
* |
|
204 |
* @param initialCapacity the initial capacity of the hashtable. |
|
58242
94bb65cb37d3
8230648: Replace @exception tag with @throws in java.base
jboes
parents:
57956
diff
changeset
|
205 |
* @throws IllegalArgumentException if the initial capacity is less |
2 | 206 |
* than zero. |
207 |
*/ |
|
208 |
public Hashtable(int initialCapacity) { |
|
209 |
this(initialCapacity, 0.75f); |
|
210 |
} |
|
211 |
||
212 |
/** |
|
213 |
* Constructs a new, empty hashtable with a default initial capacity (11) |
|
214 |
* and load factor (0.75). |
|
215 |
*/ |
|
216 |
public Hashtable() { |
|
217 |
this(11, 0.75f); |
|
218 |
} |
|
219 |
||
220 |
/** |
|
221 |
* Constructs a new hashtable with the same mappings as the given |
|
222 |
* Map. The hashtable is created with an initial capacity sufficient to |
|
223 |
* hold the mappings in the given Map and a default load factor (0.75). |
|
224 |
* |
|
225 |
* @param t the map whose mappings are to be placed in this map. |
|
226 |
* @throws NullPointerException if the specified map is null. |
|
227 |
* @since 1.2 |
|
228 |
*/ |
|
229 |
public Hashtable(Map<? extends K, ? extends V> t) { |
|
230 |
this(Math.max(2*t.size(), 11), 0.75f); |
|
231 |
putAll(t); |
|
232 |
} |
|
233 |
||
234 |
/** |
|
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
235 |
* A constructor chained from {@link Properties} keeps Hashtable fields |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
236 |
* uninitialized since they are not used. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
237 |
* |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
238 |
* @param dummy a dummy parameter |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
239 |
*/ |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
240 |
Hashtable(Void dummy) {} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
241 |
|
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
242 |
/** |
2 | 243 |
* Returns the number of keys in this hashtable. |
244 |
* |
|
245 |
* @return the number of keys in this hashtable. |
|
246 |
*/ |
|
247 |
public synchronized int size() { |
|
248 |
return count; |
|
249 |
} |
|
250 |
||
251 |
/** |
|
252 |
* Tests if this hashtable maps no keys to values. |
|
253 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
254 |
* @return {@code true} if this hashtable maps no keys to values; |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
255 |
* {@code false} otherwise. |
2 | 256 |
*/ |
257 |
public synchronized boolean isEmpty() { |
|
258 |
return count == 0; |
|
259 |
} |
|
260 |
||
261 |
/** |
|
262 |
* Returns an enumeration of the keys in this hashtable. |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
263 |
* Use the Enumeration methods on the returned object to fetch the keys |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
264 |
* sequentially. If the hashtable is structurally modified while enumerating |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
265 |
* over the keys then the results of enumerating are undefined. |
2 | 266 |
* |
267 |
* @return an enumeration of the keys in this hashtable. |
|
268 |
* @see Enumeration |
|
269 |
* @see #elements() |
|
270 |
* @see #keySet() |
|
271 |
* @see Map |
|
272 |
*/ |
|
273 |
public synchronized Enumeration<K> keys() { |
|
274 |
return this.<K>getEnumeration(KEYS); |
|
275 |
} |
|
276 |
||
277 |
/** |
|
278 |
* Returns an enumeration of the values in this hashtable. |
|
279 |
* Use the Enumeration methods on the returned object to fetch the elements |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
280 |
* sequentially. If the hashtable is structurally modified while enumerating |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
281 |
* over the values then the results of enumerating are undefined. |
2 | 282 |
* |
283 |
* @return an enumeration of the values in this hashtable. |
|
284 |
* @see java.util.Enumeration |
|
285 |
* @see #keys() |
|
286 |
* @see #values() |
|
287 |
* @see Map |
|
288 |
*/ |
|
289 |
public synchronized Enumeration<V> elements() { |
|
290 |
return this.<V>getEnumeration(VALUES); |
|
291 |
} |
|
292 |
||
293 |
/** |
|
294 |
* Tests if some key maps into the specified value in this hashtable. |
|
295 |
* This operation is more expensive than the {@link #containsKey |
|
296 |
* containsKey} method. |
|
297 |
* |
|
298 |
* <p>Note that this method is identical in functionality to |
|
299 |
* {@link #containsValue containsValue}, (which is part of the |
|
300 |
* {@link Map} interface in the collections framework). |
|
301 |
* |
|
302 |
* @param value a value to search for |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
303 |
* @return {@code true} if and only if some key maps to the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
304 |
* {@code value} argument in this hashtable as |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
305 |
* determined by the {@code equals} method; |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
306 |
* {@code false} otherwise. |
58242
94bb65cb37d3
8230648: Replace @exception tag with @throws in java.base
jboes
parents:
57956
diff
changeset
|
307 |
* @throws NullPointerException if the value is {@code null} |
2 | 308 |
*/ |
309 |
public synchronized boolean contains(Object value) { |
|
310 |
if (value == null) { |
|
311 |
throw new NullPointerException(); |
|
312 |
} |
|
313 |
||
12448 | 314 |
Entry<?,?> tab[] = table; |
2 | 315 |
for (int i = tab.length ; i-- > 0 ;) { |
12448 | 316 |
for (Entry<?,?> e = tab[i] ; e != null ; e = e.next) { |
2 | 317 |
if (e.value.equals(value)) { |
318 |
return true; |
|
319 |
} |
|
320 |
} |
|
321 |
} |
|
322 |
return false; |
|
323 |
} |
|
324 |
||
325 |
/** |
|
326 |
* Returns true if this hashtable maps one or more keys to this value. |
|
327 |
* |
|
328 |
* <p>Note that this method is identical in functionality to {@link |
|
329 |
* #contains contains} (which predates the {@link Map} interface). |
|
330 |
* |
|
331 |
* @param value value whose presence in this hashtable is to be tested |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
332 |
* @return {@code true} if this map maps one or more keys to the |
2 | 333 |
* specified value |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
334 |
* @throws NullPointerException if the value is {@code null} |
2 | 335 |
* @since 1.2 |
336 |
*/ |
|
337 |
public boolean containsValue(Object value) { |
|
338 |
return contains(value); |
|
339 |
} |
|
340 |
||
341 |
/** |
|
342 |
* Tests if the specified object is a key in this hashtable. |
|
343 |
* |
|
344 |
* @param key possible key |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
345 |
* @return {@code true} if and only if the specified object |
2 | 346 |
* is a key in this hashtable, as determined by the |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
347 |
* {@code equals} method; {@code false} otherwise. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
348 |
* @throws NullPointerException if the key is {@code null} |
2 | 349 |
* @see #contains(Object) |
350 |
*/ |
|
351 |
public synchronized boolean containsKey(Object key) { |
|
12448 | 352 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
353 |
int hash = key.hashCode(); |
2 | 354 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
12448 | 355 |
for (Entry<?,?> e = tab[index] ; e != null ; e = e.next) { |
2 | 356 |
if ((e.hash == hash) && e.key.equals(key)) { |
357 |
return true; |
|
358 |
} |
|
359 |
} |
|
360 |
return false; |
|
361 |
} |
|
362 |
||
363 |
/** |
|
364 |
* Returns the value to which the specified key is mapped, |
|
365 |
* or {@code null} if this map contains no mapping for the key. |
|
366 |
* |
|
367 |
* <p>More formally, if this map contains a mapping from a key |
|
368 |
* {@code k} to a value {@code v} such that {@code (key.equals(k))}, |
|
369 |
* then this method returns {@code v}; otherwise it returns |
|
370 |
* {@code null}. (There can be at most one such mapping.) |
|
371 |
* |
|
372 |
* @param key the key whose associated value is to be returned |
|
373 |
* @return the value to which the specified key is mapped, or |
|
374 |
* {@code null} if this map contains no mapping for the key |
|
375 |
* @throws NullPointerException if the specified key is null |
|
376 |
* @see #put(Object, Object) |
|
377 |
*/ |
|
12448 | 378 |
@SuppressWarnings("unchecked") |
2 | 379 |
public synchronized V get(Object key) { |
12448 | 380 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
381 |
int hash = key.hashCode(); |
2 | 382 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
12448 | 383 |
for (Entry<?,?> e = tab[index] ; e != null ; e = e.next) { |
2 | 384 |
if ((e.hash == hash) && e.key.equals(key)) { |
12448 | 385 |
return (V)e.value; |
2 | 386 |
} |
387 |
} |
|
388 |
return null; |
|
389 |
} |
|
390 |
||
391 |
/** |
|
5466
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
392 |
* The maximum size of array to allocate. |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
393 |
* Some VMs reserve some header words in an array. |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
394 |
* Attempts to allocate larger arrays may result in |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
395 |
* OutOfMemoryError: Requested array size exceeds VM limit |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
396 |
*/ |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
397 |
private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
398 |
|
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
399 |
/** |
2 | 400 |
* Increases the capacity of and internally reorganizes this |
401 |
* hashtable, in order to accommodate and access its entries more |
|
402 |
* efficiently. This method is called automatically when the |
|
403 |
* number of keys in the hashtable exceeds this hashtable's capacity |
|
404 |
* and load factor. |
|
405 |
*/ |
|
12448 | 406 |
@SuppressWarnings("unchecked") |
2 | 407 |
protected void rehash() { |
408 |
int oldCapacity = table.length; |
|
12448 | 409 |
Entry<?,?>[] oldMap = table; |
2 | 410 |
|
5466
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
411 |
// overflow-conscious code |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
412 |
int newCapacity = (oldCapacity << 1) + 1; |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
413 |
if (newCapacity - MAX_ARRAY_SIZE > 0) { |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
414 |
if (oldCapacity == MAX_ARRAY_SIZE) |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
415 |
// Keep running with MAX_ARRAY_SIZE buckets |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
416 |
return; |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
417 |
newCapacity = MAX_ARRAY_SIZE; |
f130bb07764b
6933217: Huge arrays handled poorly in core libraries
martin
parents:
715
diff
changeset
|
418 |
} |
12448 | 419 |
Entry<?,?>[] newMap = new Entry<?,?>[newCapacity]; |
2 | 420 |
|
421 |
modCount++; |
|
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
422 |
threshold = (int)Math.min(newCapacity * loadFactor, MAX_ARRAY_SIZE + 1); |
2 | 423 |
table = newMap; |
424 |
||
425 |
for (int i = oldCapacity ; i-- > 0 ;) { |
|
12448 | 426 |
for (Entry<K,V> old = (Entry<K,V>)oldMap[i] ; old != null ; ) { |
2 | 427 |
Entry<K,V> e = old; |
428 |
old = old.next; |
|
429 |
||
430 |
int index = (e.hash & 0x7FFFFFFF) % newCapacity; |
|
12448 | 431 |
e.next = (Entry<K,V>)newMap[index]; |
2 | 432 |
newMap[index] = e; |
433 |
} |
|
434 |
} |
|
435 |
} |
|
436 |
||
16867 | 437 |
private void addEntry(int hash, K key, V value, int index) { |
438 |
Entry<?,?> tab[] = table; |
|
439 |
if (count >= threshold) { |
|
440 |
// Rehash the table if the threshold is exceeded |
|
441 |
rehash(); |
|
442 |
||
443 |
tab = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
444 |
hash = key.hashCode(); |
16867 | 445 |
index = (hash & 0x7FFFFFFF) % tab.length; |
446 |
} |
|
447 |
||
448 |
// Creates the new entry. |
|
449 |
@SuppressWarnings("unchecked") |
|
450 |
Entry<K,V> e = (Entry<K,V>) tab[index]; |
|
451 |
tab[index] = new Entry<>(hash, key, value, e); |
|
452 |
count++; |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
453 |
modCount++; |
16867 | 454 |
} |
455 |
||
2 | 456 |
/** |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
457 |
* Maps the specified {@code key} to the specified |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
458 |
* {@code value} in this hashtable. Neither the key nor the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
459 |
* value can be {@code null}. <p> |
2 | 460 |
* |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
461 |
* The value can be retrieved by calling the {@code get} method |
2 | 462 |
* with a key that is equal to the original key. |
463 |
* |
|
464 |
* @param key the hashtable key |
|
465 |
* @param value the value |
|
466 |
* @return the previous value of the specified key in this hashtable, |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
467 |
* or {@code null} if it did not have one |
58242
94bb65cb37d3
8230648: Replace @exception tag with @throws in java.base
jboes
parents:
57956
diff
changeset
|
468 |
* @throws NullPointerException if the key or value is |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
469 |
* {@code null} |
2 | 470 |
* @see Object#equals(Object) |
471 |
* @see #get(Object) |
|
472 |
*/ |
|
473 |
public synchronized V put(K key, V value) { |
|
474 |
// Make sure the value is not null |
|
475 |
if (value == null) { |
|
476 |
throw new NullPointerException(); |
|
477 |
} |
|
478 |
||
479 |
// Makes sure the key is not already in the hashtable. |
|
12448 | 480 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
481 |
int hash = key.hashCode(); |
2 | 482 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
12448 | 483 |
@SuppressWarnings("unchecked") |
484 |
Entry<K,V> entry = (Entry<K,V>)tab[index]; |
|
485 |
for(; entry != null ; entry = entry.next) { |
|
486 |
if ((entry.hash == hash) && entry.key.equals(key)) { |
|
487 |
V old = entry.value; |
|
488 |
entry.value = value; |
|
2 | 489 |
return old; |
490 |
} |
|
491 |
} |
|
492 |
||
16867 | 493 |
addEntry(hash, key, value, index); |
2 | 494 |
return null; |
495 |
} |
|
496 |
||
497 |
/** |
|
498 |
* Removes the key (and its corresponding value) from this |
|
499 |
* hashtable. This method does nothing if the key is not in the hashtable. |
|
500 |
* |
|
501 |
* @param key the key that needs to be removed |
|
502 |
* @return the value to which the key had been mapped in this hashtable, |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
503 |
* or {@code null} if the key did not have a mapping |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
504 |
* @throws NullPointerException if the key is {@code null} |
2 | 505 |
*/ |
506 |
public synchronized V remove(Object key) { |
|
12448 | 507 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
508 |
int hash = key.hashCode(); |
2 | 509 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
12448 | 510 |
@SuppressWarnings("unchecked") |
511 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
512 |
for(Entry<K,V> prev = null ; e != null ; prev = e, e = e.next) { |
|
2 | 513 |
if ((e.hash == hash) && e.key.equals(key)) { |
514 |
if (prev != null) { |
|
515 |
prev.next = e.next; |
|
516 |
} else { |
|
517 |
tab[index] = e.next; |
|
518 |
} |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
519 |
modCount++; |
2 | 520 |
count--; |
521 |
V oldValue = e.value; |
|
522 |
e.value = null; |
|
523 |
return oldValue; |
|
524 |
} |
|
525 |
} |
|
526 |
return null; |
|
527 |
} |
|
528 |
||
529 |
/** |
|
530 |
* Copies all of the mappings from the specified map to this hashtable. |
|
531 |
* These mappings will replace any mappings that this hashtable had for any |
|
532 |
* of the keys currently in the specified map. |
|
533 |
* |
|
534 |
* @param t mappings to be stored in this map |
|
535 |
* @throws NullPointerException if the specified map is null |
|
536 |
* @since 1.2 |
|
537 |
*/ |
|
538 |
public synchronized void putAll(Map<? extends K, ? extends V> t) { |
|
539 |
for (Map.Entry<? extends K, ? extends V> e : t.entrySet()) |
|
540 |
put(e.getKey(), e.getValue()); |
|
541 |
} |
|
542 |
||
543 |
/** |
|
544 |
* Clears this hashtable so that it contains no keys. |
|
545 |
*/ |
|
546 |
public synchronized void clear() { |
|
12448 | 547 |
Entry<?,?> tab[] = table; |
2 | 548 |
for (int index = tab.length; --index >= 0; ) |
549 |
tab[index] = null; |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
550 |
modCount++; |
2 | 551 |
count = 0; |
552 |
} |
|
553 |
||
554 |
/** |
|
555 |
* Creates a shallow copy of this hashtable. All the structure of the |
|
556 |
* hashtable itself is copied, but the keys and values are not cloned. |
|
557 |
* This is a relatively expensive operation. |
|
558 |
* |
|
559 |
* @return a clone of the hashtable |
|
560 |
*/ |
|
561 |
public synchronized Object clone() { |
|
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
562 |
Hashtable<?,?> t = cloneHashtable(); |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
563 |
t.table = new Entry<?,?>[table.length]; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
564 |
for (int i = table.length ; i-- > 0 ; ) { |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
565 |
t.table[i] = (table[i] != null) |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
566 |
? (Entry<?,?>) table[i].clone() : null; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
567 |
} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
568 |
t.keySet = null; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
569 |
t.entrySet = null; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
570 |
t.values = null; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
571 |
t.modCount = 0; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
572 |
return t; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
573 |
} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
574 |
|
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
575 |
/** Calls super.clone() */ |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
576 |
final Hashtable<?,?> cloneHashtable() { |
2 | 577 |
try { |
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
578 |
return (Hashtable<?,?>)super.clone(); |
2 | 579 |
} catch (CloneNotSupportedException e) { |
580 |
// this shouldn't happen, since we are Cloneable |
|
10419
12c063b39232
7084245: Update usages of InternalError to use exception chaining
sherman
parents:
9035
diff
changeset
|
581 |
throw new InternalError(e); |
2 | 582 |
} |
583 |
} |
|
584 |
||
585 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
586 |
* Returns a string representation of this {@code Hashtable} object |
2 | 587 |
* in the form of a set of entries, enclosed in braces and separated |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
588 |
* by the ASCII characters "<code> , </code>" (comma and space). Each |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
589 |
* entry is rendered as the key, an equals sign {@code =}, and the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
590 |
* associated element, where the {@code toString} method is used to |
2 | 591 |
* convert the key and element to strings. |
592 |
* |
|
593 |
* @return a string representation of this hashtable |
|
594 |
*/ |
|
595 |
public synchronized String toString() { |
|
596 |
int max = size() - 1; |
|
597 |
if (max == -1) |
|
598 |
return "{}"; |
|
599 |
||
600 |
StringBuilder sb = new StringBuilder(); |
|
601 |
Iterator<Map.Entry<K,V>> it = entrySet().iterator(); |
|
602 |
||
603 |
sb.append('{'); |
|
604 |
for (int i = 0; ; i++) { |
|
605 |
Map.Entry<K,V> e = it.next(); |
|
606 |
K key = e.getKey(); |
|
607 |
V value = e.getValue(); |
|
608 |
sb.append(key == this ? "(this Map)" : key.toString()); |
|
609 |
sb.append('='); |
|
610 |
sb.append(value == this ? "(this Map)" : value.toString()); |
|
611 |
||
612 |
if (i == max) |
|
613 |
return sb.append('}').toString(); |
|
614 |
sb.append(", "); |
|
615 |
} |
|
616 |
} |
|
617 |
||
618 |
||
619 |
private <T> Enumeration<T> getEnumeration(int type) { |
|
620 |
if (count == 0) { |
|
621 |
return Collections.emptyEnumeration(); |
|
622 |
} else { |
|
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
623 |
return new Enumerator<>(type, false); |
2 | 624 |
} |
625 |
} |
|
626 |
||
627 |
private <T> Iterator<T> getIterator(int type) { |
|
628 |
if (count == 0) { |
|
629 |
return Collections.emptyIterator(); |
|
630 |
} else { |
|
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
631 |
return new Enumerator<>(type, true); |
2 | 632 |
} |
633 |
} |
|
634 |
||
635 |
// Views |
|
636 |
||
637 |
/** |
|
638 |
* Each of these fields are initialized to contain an instance of the |
|
639 |
* appropriate view the first time this view is requested. The views are |
|
640 |
* stateless, so there's no reason to create more than one of each. |
|
641 |
*/ |
|
23746 | 642 |
private transient volatile Set<K> keySet; |
643 |
private transient volatile Set<Map.Entry<K,V>> entrySet; |
|
644 |
private transient volatile Collection<V> values; |
|
2 | 645 |
|
646 |
/** |
|
647 |
* Returns a {@link Set} view of the keys contained in this map. |
|
648 |
* The set is backed by the map, so changes to the map are |
|
649 |
* reflected in the set, and vice-versa. If the map is modified |
|
650 |
* while an iteration over the set is in progress (except through |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
651 |
* the iterator's own {@code remove} operation), the results of |
2 | 652 |
* the iteration are undefined. The set supports element removal, |
653 |
* which removes the corresponding mapping from the map, via the |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
654 |
* {@code Iterator.remove}, {@code Set.remove}, |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
655 |
* {@code removeAll}, {@code retainAll}, and {@code clear} |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
656 |
* operations. It does not support the {@code add} or {@code addAll} |
2 | 657 |
* operations. |
658 |
* |
|
659 |
* @since 1.2 |
|
660 |
*/ |
|
661 |
public Set<K> keySet() { |
|
662 |
if (keySet == null) |
|
663 |
keySet = Collections.synchronizedSet(new KeySet(), this); |
|
664 |
return keySet; |
|
665 |
} |
|
666 |
||
667 |
private class KeySet extends AbstractSet<K> { |
|
668 |
public Iterator<K> iterator() { |
|
669 |
return getIterator(KEYS); |
|
670 |
} |
|
671 |
public int size() { |
|
672 |
return count; |
|
673 |
} |
|
674 |
public boolean contains(Object o) { |
|
675 |
return containsKey(o); |
|
676 |
} |
|
677 |
public boolean remove(Object o) { |
|
678 |
return Hashtable.this.remove(o) != null; |
|
679 |
} |
|
680 |
public void clear() { |
|
681 |
Hashtable.this.clear(); |
|
682 |
} |
|
683 |
} |
|
684 |
||
685 |
/** |
|
686 |
* Returns a {@link Set} view of the mappings contained in this map. |
|
687 |
* The set is backed by the map, so changes to the map are |
|
688 |
* reflected in the set, and vice-versa. If the map is modified |
|
689 |
* while an iteration over the set is in progress (except through |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
690 |
* the iterator's own {@code remove} operation, or through the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
691 |
* {@code setValue} operation on a map entry returned by the |
2 | 692 |
* iterator) the results of the iteration are undefined. The set |
693 |
* supports element removal, which removes the corresponding |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
694 |
* mapping from the map, via the {@code Iterator.remove}, |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
695 |
* {@code Set.remove}, {@code removeAll}, {@code retainAll} and |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
696 |
* {@code clear} operations. It does not support the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
697 |
* {@code add} or {@code addAll} operations. |
2 | 698 |
* |
699 |
* @since 1.2 |
|
700 |
*/ |
|
701 |
public Set<Map.Entry<K,V>> entrySet() { |
|
702 |
if (entrySet==null) |
|
703 |
entrySet = Collections.synchronizedSet(new EntrySet(), this); |
|
704 |
return entrySet; |
|
705 |
} |
|
706 |
||
707 |
private class EntrySet extends AbstractSet<Map.Entry<K,V>> { |
|
708 |
public Iterator<Map.Entry<K,V>> iterator() { |
|
709 |
return getIterator(ENTRIES); |
|
710 |
} |
|
711 |
||
712 |
public boolean add(Map.Entry<K,V> o) { |
|
713 |
return super.add(o); |
|
714 |
} |
|
715 |
||
716 |
public boolean contains(Object o) { |
|
717 |
if (!(o instanceof Map.Entry)) |
|
718 |
return false; |
|
12448 | 719 |
Map.Entry<?,?> entry = (Map.Entry<?,?>)o; |
2 | 720 |
Object key = entry.getKey(); |
12448 | 721 |
Entry<?,?>[] tab = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
722 |
int hash = key.hashCode(); |
2 | 723 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
724 |
||
12448 | 725 |
for (Entry<?,?> e = tab[index]; e != null; e = e.next) |
2 | 726 |
if (e.hash==hash && e.equals(entry)) |
727 |
return true; |
|
728 |
return false; |
|
729 |
} |
|
730 |
||
731 |
public boolean remove(Object o) { |
|
732 |
if (!(o instanceof Map.Entry)) |
|
733 |
return false; |
|
12448 | 734 |
Map.Entry<?,?> entry = (Map.Entry<?,?>) o; |
735 |
Object key = entry.getKey(); |
|
736 |
Entry<?,?>[] tab = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
737 |
int hash = key.hashCode(); |
2 | 738 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
739 |
||
12448 | 740 |
@SuppressWarnings("unchecked") |
741 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
742 |
for(Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
2 | 743 |
if (e.hash==hash && e.equals(entry)) { |
744 |
if (prev != null) |
|
745 |
prev.next = e.next; |
|
746 |
else |
|
747 |
tab[index] = e.next; |
|
748 |
||
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
749 |
e.value = null; // clear for gc. |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
750 |
modCount++; |
2 | 751 |
count--; |
752 |
return true; |
|
753 |
} |
|
754 |
} |
|
755 |
return false; |
|
756 |
} |
|
757 |
||
758 |
public int size() { |
|
759 |
return count; |
|
760 |
} |
|
761 |
||
762 |
public void clear() { |
|
763 |
Hashtable.this.clear(); |
|
764 |
} |
|
765 |
} |
|
766 |
||
767 |
/** |
|
768 |
* Returns a {@link Collection} view of the values contained in this map. |
|
769 |
* The collection is backed by the map, so changes to the map are |
|
770 |
* reflected in the collection, and vice-versa. If the map is |
|
771 |
* modified while an iteration over the collection is in progress |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
772 |
* (except through the iterator's own {@code remove} operation), |
2 | 773 |
* the results of the iteration are undefined. The collection |
774 |
* supports element removal, which removes the corresponding |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
775 |
* mapping from the map, via the {@code Iterator.remove}, |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
776 |
* {@code Collection.remove}, {@code removeAll}, |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
777 |
* {@code retainAll} and {@code clear} operations. It does not |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
29743
diff
changeset
|
778 |
* support the {@code add} or {@code addAll} operations. |
2 | 779 |
* |
780 |
* @since 1.2 |
|
781 |
*/ |
|
782 |
public Collection<V> values() { |
|
783 |
if (values==null) |
|
784 |
values = Collections.synchronizedCollection(new ValueCollection(), |
|
785 |
this); |
|
786 |
return values; |
|
787 |
} |
|
788 |
||
789 |
private class ValueCollection extends AbstractCollection<V> { |
|
790 |
public Iterator<V> iterator() { |
|
791 |
return getIterator(VALUES); |
|
792 |
} |
|
793 |
public int size() { |
|
794 |
return count; |
|
795 |
} |
|
796 |
public boolean contains(Object o) { |
|
797 |
return containsValue(o); |
|
798 |
} |
|
799 |
public void clear() { |
|
800 |
Hashtable.this.clear(); |
|
801 |
} |
|
802 |
} |
|
803 |
||
804 |
// Comparison and hashing |
|
805 |
||
806 |
/** |
|
807 |
* Compares the specified Object with this Map for equality, |
|
808 |
* as per the definition in the Map interface. |
|
809 |
* |
|
810 |
* @param o object to be compared for equality with this hashtable |
|
811 |
* @return true if the specified Object is equal to this Map |
|
812 |
* @see Map#equals(Object) |
|
813 |
* @since 1.2 |
|
814 |
*/ |
|
815 |
public synchronized boolean equals(Object o) { |
|
816 |
if (o == this) |
|
817 |
return true; |
|
818 |
||
819 |
if (!(o instanceof Map)) |
|
820 |
return false; |
|
12448 | 821 |
Map<?,?> t = (Map<?,?>) o; |
2 | 822 |
if (t.size() != size()) |
823 |
return false; |
|
824 |
||
825 |
try { |
|
22078
bdec5d53e98c
8030851: Update code in java.util to use newer language features
psandoz
parents:
19855
diff
changeset
|
826 |
for (Map.Entry<K, V> e : entrySet()) { |
2 | 827 |
K key = e.getKey(); |
828 |
V value = e.getValue(); |
|
829 |
if (value == null) { |
|
22078
bdec5d53e98c
8030851: Update code in java.util to use newer language features
psandoz
parents:
19855
diff
changeset
|
830 |
if (!(t.get(key) == null && t.containsKey(key))) |
2 | 831 |
return false; |
832 |
} else { |
|
833 |
if (!value.equals(t.get(key))) |
|
834 |
return false; |
|
835 |
} |
|
836 |
} |
|
837 |
} catch (ClassCastException unused) { |
|
838 |
return false; |
|
839 |
} catch (NullPointerException unused) { |
|
840 |
return false; |
|
841 |
} |
|
842 |
||
843 |
return true; |
|
844 |
} |
|
845 |
||
846 |
/** |
|
847 |
* Returns the hash code value for this Map as per the definition in the |
|
848 |
* Map interface. |
|
849 |
* |
|
850 |
* @see Map#hashCode() |
|
851 |
* @since 1.2 |
|
852 |
*/ |
|
853 |
public synchronized int hashCode() { |
|
854 |
/* |
|
855 |
* This code detects the recursion caused by computing the hash code |
|
856 |
* of a self-referential hash table and prevents the stack overflow |
|
857 |
* that would otherwise result. This allows certain 1.1-era |
|
858 |
* applets with self-referential hash tables to work. This code |
|
859 |
* abuses the loadFactor field to do double-duty as a hashCode |
|
860 |
* in progress flag, so as not to worsen the space performance. |
|
861 |
* A negative load factor indicates that hash code computation is |
|
862 |
* in progress. |
|
863 |
*/ |
|
864 |
int h = 0; |
|
865 |
if (count == 0 || loadFactor < 0) |
|
866 |
return h; // Returns zero |
|
867 |
||
868 |
loadFactor = -loadFactor; // Mark hashCode computation in progress |
|
12448 | 869 |
Entry<?,?>[] tab = table; |
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
870 |
for (Entry<?,?> entry : tab) { |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
871 |
while (entry != null) { |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
872 |
h += entry.hashCode(); |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
873 |
entry = entry.next; |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
874 |
} |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
875 |
} |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
876 |
|
2 | 877 |
loadFactor = -loadFactor; // Mark hashCode computation complete |
878 |
||
879 |
return h; |
|
880 |
} |
|
881 |
||
16867 | 882 |
@Override |
883 |
public synchronized V getOrDefault(Object key, V defaultValue) { |
|
884 |
V result = get(key); |
|
885 |
return (null == result) ? defaultValue : result; |
|
886 |
} |
|
887 |
||
19208
1e3d351eba80
8022412: Fixed warnings in java.util root, except for HashMap
lagergren
parents:
18280
diff
changeset
|
888 |
@SuppressWarnings("unchecked") |
16867 | 889 |
@Override |
890 |
public synchronized void forEach(BiConsumer<? super K, ? super V> action) { |
|
891 |
Objects.requireNonNull(action); // explicit check required in case |
|
892 |
// table is empty. |
|
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
893 |
final int expectedModCount = modCount; |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
894 |
|
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
895 |
Entry<?, ?>[] tab = table; |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
896 |
for (Entry<?, ?> entry : tab) { |
16867 | 897 |
while (entry != null) { |
898 |
action.accept((K)entry.key, (V)entry.value); |
|
899 |
entry = entry.next; |
|
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
900 |
|
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
901 |
if (expectedModCount != modCount) { |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
902 |
throw new ConcurrentModificationException(); |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
903 |
} |
16867 | 904 |
} |
905 |
} |
|
906 |
} |
|
907 |
||
19208
1e3d351eba80
8022412: Fixed warnings in java.util root, except for HashMap
lagergren
parents:
18280
diff
changeset
|
908 |
@SuppressWarnings("unchecked") |
16867 | 909 |
@Override |
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
910 |
public synchronized void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
911 |
Objects.requireNonNull(function); // explicit check required in case |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
912 |
// table is empty. |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
913 |
final int expectedModCount = modCount; |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
914 |
|
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
915 |
Entry<K, V>[] tab = (Entry<K, V>[])table; |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
916 |
for (Entry<K, V> entry : tab) { |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
917 |
while (entry != null) { |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
918 |
entry.value = Objects.requireNonNull( |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
919 |
function.apply(entry.key, entry.value)); |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
920 |
entry = entry.next; |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
921 |
|
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
922 |
if (expectedModCount != modCount) { |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
923 |
throw new ConcurrentModificationException(); |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
924 |
} |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
925 |
} |
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
926 |
} |
16867 | 927 |
} |
928 |
||
929 |
@Override |
|
930 |
public synchronized V putIfAbsent(K key, V value) { |
|
931 |
Objects.requireNonNull(value); |
|
932 |
||
933 |
// Makes sure the key is not already in the hashtable. |
|
934 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
935 |
int hash = key.hashCode(); |
16867 | 936 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
937 |
@SuppressWarnings("unchecked") |
|
938 |
Entry<K,V> entry = (Entry<K,V>)tab[index]; |
|
939 |
for (; entry != null; entry = entry.next) { |
|
940 |
if ((entry.hash == hash) && entry.key.equals(key)) { |
|
941 |
V old = entry.value; |
|
942 |
if (old == null) { |
|
943 |
entry.value = value; |
|
944 |
} |
|
945 |
return old; |
|
946 |
} |
|
947 |
} |
|
948 |
||
949 |
addEntry(hash, key, value, index); |
|
950 |
return null; |
|
951 |
} |
|
952 |
||
953 |
@Override |
|
954 |
public synchronized boolean remove(Object key, Object value) { |
|
955 |
Objects.requireNonNull(value); |
|
956 |
||
957 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
958 |
int hash = key.hashCode(); |
16867 | 959 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
960 |
@SuppressWarnings("unchecked") |
|
961 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
962 |
for (Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
963 |
if ((e.hash == hash) && e.key.equals(key) && e.value.equals(value)) { |
|
964 |
if (prev != null) { |
|
965 |
prev.next = e.next; |
|
966 |
} else { |
|
967 |
tab[index] = e.next; |
|
968 |
} |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
969 |
e.value = null; // clear for gc |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
970 |
modCount++; |
16867 | 971 |
count--; |
972 |
return true; |
|
973 |
} |
|
974 |
} |
|
975 |
return false; |
|
976 |
} |
|
977 |
||
978 |
@Override |
|
979 |
public synchronized boolean replace(K key, V oldValue, V newValue) { |
|
19855 | 980 |
Objects.requireNonNull(oldValue); |
981 |
Objects.requireNonNull(newValue); |
|
16867 | 982 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
983 |
int hash = key.hashCode(); |
16867 | 984 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
985 |
@SuppressWarnings("unchecked") |
|
986 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
987 |
for (; e != null; e = e.next) { |
|
988 |
if ((e.hash == hash) && e.key.equals(key)) { |
|
989 |
if (e.value.equals(oldValue)) { |
|
990 |
e.value = newValue; |
|
991 |
return true; |
|
992 |
} else { |
|
993 |
return false; |
|
994 |
} |
|
995 |
} |
|
996 |
} |
|
997 |
return false; |
|
998 |
} |
|
999 |
||
1000 |
@Override |
|
1001 |
public synchronized V replace(K key, V value) { |
|
19855 | 1002 |
Objects.requireNonNull(value); |
16867 | 1003 |
Entry<?,?> tab[] = table; |
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1004 |
int hash = key.hashCode(); |
16867 | 1005 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
1006 |
@SuppressWarnings("unchecked") |
|
1007 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1008 |
for (; e != null; e = e.next) { |
|
1009 |
if ((e.hash == hash) && e.key.equals(key)) { |
|
1010 |
V oldValue = e.value; |
|
1011 |
e.value = value; |
|
1012 |
return oldValue; |
|
1013 |
} |
|
1014 |
} |
|
1015 |
return null; |
|
1016 |
} |
|
1017 |
||
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1018 |
/** |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1019 |
* {@inheritDoc} |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1020 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1021 |
* <p>This method will, on a best-effort basis, throw a |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1022 |
* {@link java.util.ConcurrentModificationException} if the mapping |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1023 |
* function modified this map during computation. |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1024 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1025 |
* @throws ConcurrentModificationException if it is detected that the |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1026 |
* mapping function modified this map |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1027 |
*/ |
16867 | 1028 |
@Override |
1029 |
public synchronized V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { |
|
1030 |
Objects.requireNonNull(mappingFunction); |
|
1031 |
||
1032 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1033 |
int hash = key.hashCode(); |
16867 | 1034 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
1035 |
@SuppressWarnings("unchecked") |
|
1036 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1037 |
for (; e != null; e = e.next) { |
|
1038 |
if (e.hash == hash && e.key.equals(key)) { |
|
1039 |
// Hashtable not accept null value |
|
1040 |
return e.value; |
|
1041 |
} |
|
1042 |
} |
|
1043 |
||
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1044 |
int mc = modCount; |
16867 | 1045 |
V newValue = mappingFunction.apply(key); |
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1046 |
if (mc != modCount) { throw new ConcurrentModificationException(); } |
16867 | 1047 |
if (newValue != null) { |
1048 |
addEntry(hash, key, newValue, index); |
|
1049 |
} |
|
1050 |
||
1051 |
return newValue; |
|
1052 |
} |
|
1053 |
||
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1054 |
/** |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1055 |
* {@inheritDoc} |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1056 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1057 |
* <p>This method will, on a best-effort basis, throw a |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1058 |
* {@link java.util.ConcurrentModificationException} if the remapping |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1059 |
* function modified this map during computation. |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1060 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1061 |
* @throws ConcurrentModificationException if it is detected that the |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1062 |
* remapping function modified this map |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1063 |
*/ |
16867 | 1064 |
@Override |
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
1065 |
public synchronized V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
16867 | 1066 |
Objects.requireNonNull(remappingFunction); |
1067 |
||
1068 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1069 |
int hash = key.hashCode(); |
16867 | 1070 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
1071 |
@SuppressWarnings("unchecked") |
|
1072 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1073 |
for (Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
1074 |
if (e.hash == hash && e.key.equals(key)) { |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1075 |
int mc = modCount; |
16867 | 1076 |
V newValue = remappingFunction.apply(key, e.value); |
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1077 |
if (mc != modCount) { |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1078 |
throw new ConcurrentModificationException(); |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1079 |
} |
16867 | 1080 |
if (newValue == null) { |
1081 |
if (prev != null) { |
|
1082 |
prev.next = e.next; |
|
1083 |
} else { |
|
1084 |
tab[index] = e.next; |
|
1085 |
} |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1086 |
modCount = mc + 1; |
16867 | 1087 |
count--; |
1088 |
} else { |
|
1089 |
e.value = newValue; |
|
1090 |
} |
|
1091 |
return newValue; |
|
1092 |
} |
|
1093 |
} |
|
1094 |
return null; |
|
1095 |
} |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1096 |
/** |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1097 |
* {@inheritDoc} |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1098 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1099 |
* <p>This method will, on a best-effort basis, throw a |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1100 |
* {@link java.util.ConcurrentModificationException} if the remapping |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1101 |
* function modified this map during computation. |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1102 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1103 |
* @throws ConcurrentModificationException if it is detected that the |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1104 |
* remapping function modified this map |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1105 |
*/ |
16867 | 1106 |
@Override |
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
1107 |
public synchronized V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
16867 | 1108 |
Objects.requireNonNull(remappingFunction); |
1109 |
||
1110 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1111 |
int hash = key.hashCode(); |
16867 | 1112 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
1113 |
@SuppressWarnings("unchecked") |
|
1114 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1115 |
for (Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
1116 |
if (e.hash == hash && Objects.equals(e.key, key)) { |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1117 |
int mc = modCount; |
16867 | 1118 |
V newValue = remappingFunction.apply(key, e.value); |
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1119 |
if (mc != modCount) { |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1120 |
throw new ConcurrentModificationException(); |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1121 |
} |
16867 | 1122 |
if (newValue == null) { |
1123 |
if (prev != null) { |
|
1124 |
prev.next = e.next; |
|
1125 |
} else { |
|
1126 |
tab[index] = e.next; |
|
1127 |
} |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1128 |
modCount = mc + 1; |
16867 | 1129 |
count--; |
1130 |
} else { |
|
1131 |
e.value = newValue; |
|
1132 |
} |
|
1133 |
return newValue; |
|
1134 |
} |
|
1135 |
} |
|
1136 |
||
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1137 |
int mc = modCount; |
16867 | 1138 |
V newValue = remappingFunction.apply(key, null); |
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1139 |
if (mc != modCount) { throw new ConcurrentModificationException(); } |
16867 | 1140 |
if (newValue != null) { |
1141 |
addEntry(hash, key, newValue, index); |
|
1142 |
} |
|
1143 |
||
1144 |
return newValue; |
|
1145 |
} |
|
1146 |
||
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1147 |
/** |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1148 |
* {@inheritDoc} |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1149 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1150 |
* <p>This method will, on a best-effort basis, throw a |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1151 |
* {@link java.util.ConcurrentModificationException} if the remapping |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1152 |
* function modified this map during computation. |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1153 |
* |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1154 |
* @throws ConcurrentModificationException if it is detected that the |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1155 |
* remapping function modified this map |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1156 |
*/ |
16867 | 1157 |
@Override |
18280
6c3c0ff49eb5
8016446: Improve forEach/replaceAll for Map, HashMap, Hashtable, IdentityHashMap, WeakHashMap, TreeMap, ConcurrentMap
mduigou
parents:
18166
diff
changeset
|
1158 |
public synchronized V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { |
16867 | 1159 |
Objects.requireNonNull(remappingFunction); |
1160 |
||
1161 |
Entry<?,?> tab[] = table; |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1162 |
int hash = key.hashCode(); |
16867 | 1163 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
1164 |
@SuppressWarnings("unchecked") |
|
1165 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1166 |
for (Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
1167 |
if (e.hash == hash && e.key.equals(key)) { |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1168 |
int mc = modCount; |
16867 | 1169 |
V newValue = remappingFunction.apply(e.value, value); |
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1170 |
if (mc != modCount) { |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1171 |
throw new ConcurrentModificationException(); |
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1172 |
} |
16867 | 1173 |
if (newValue == null) { |
1174 |
if (prev != null) { |
|
1175 |
prev.next = e.next; |
|
1176 |
} else { |
|
1177 |
tab[index] = e.next; |
|
1178 |
} |
|
29743
981893a47bec
8071667: HashMap.computeIfAbsent() adds entry that HashMap.get() does not find.
bchristi
parents:
28559
diff
changeset
|
1179 |
modCount = mc + 1; |
16867 | 1180 |
count--; |
1181 |
} else { |
|
1182 |
e.value = newValue; |
|
1183 |
} |
|
1184 |
return newValue; |
|
1185 |
} |
|
1186 |
} |
|
1187 |
||
1188 |
if (value != null) { |
|
1189 |
addEntry(hash, key, value, index); |
|
1190 |
} |
|
1191 |
||
1192 |
return value; |
|
1193 |
} |
|
1194 |
||
2 | 1195 |
/** |
1196 |
* Save the state of the Hashtable to a stream (i.e., serialize it). |
|
1197 |
* |
|
1198 |
* @serialData The <i>capacity</i> of the Hashtable (the length of the |
|
1199 |
* bucket array) is emitted (int), followed by the |
|
1200 |
* <i>size</i> of the Hashtable (the number of key-value |
|
1201 |
* mappings), followed by the key (Object) and value (Object) |
|
1202 |
* for each key-value mapping represented by the Hashtable |
|
1203 |
* The key-value mappings are emitted in no particular order. |
|
1204 |
*/ |
|
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
52427
diff
changeset
|
1205 |
@java.io.Serial |
8394 | 1206 |
private void writeObject(java.io.ObjectOutputStream s) |
1207 |
throws IOException { |
|
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1208 |
writeHashtable(s); |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1209 |
} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1210 |
|
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1211 |
/** |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1212 |
* Perform serialization of the Hashtable to an ObjectOutputStream. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1213 |
* The Properties class overrides this method. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1214 |
*/ |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1215 |
void writeHashtable(java.io.ObjectOutputStream s) |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1216 |
throws IOException { |
8394 | 1217 |
Entry<Object, Object> entryStack = null; |
1218 |
||
1219 |
synchronized (this) { |
|
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1220 |
// Write out the threshold and loadFactor |
8394 | 1221 |
s.defaultWriteObject(); |
1222 |
||
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1223 |
// Write out the length and count of elements |
8394 | 1224 |
s.writeInt(table.length); |
1225 |
s.writeInt(count); |
|
2 | 1226 |
|
8394 | 1227 |
// Stack copies of the entries in the table |
22078
bdec5d53e98c
8030851: Update code in java.util to use newer language features
psandoz
parents:
19855
diff
changeset
|
1228 |
for (Entry<?, ?> entry : table) { |
2 | 1229 |
|
8394 | 1230 |
while (entry != null) { |
1231 |
entryStack = |
|
1232 |
new Entry<>(0, entry.key, entry.value, entryStack); |
|
1233 |
entry = entry.next; |
|
1234 |
} |
|
2 | 1235 |
} |
1236 |
} |
|
8394 | 1237 |
|
1238 |
// Write out the key/value objects from the stacked entries |
|
1239 |
while (entryStack != null) { |
|
1240 |
s.writeObject(entryStack.key); |
|
1241 |
s.writeObject(entryStack.value); |
|
1242 |
entryStack = entryStack.next; |
|
1243 |
} |
|
2 | 1244 |
} |
1245 |
||
1246 |
/** |
|
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1247 |
* Called by Properties to write out a simulated threshold and loadfactor. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1248 |
*/ |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1249 |
final void defaultWriteHashtable(java.io.ObjectOutputStream s, int length, |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1250 |
float loadFactor) throws IOException { |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1251 |
this.threshold = (int)Math.min(length * loadFactor, MAX_ARRAY_SIZE + 1); |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1252 |
this.loadFactor = loadFactor; |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1253 |
s.defaultWriteObject(); |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1254 |
} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1255 |
|
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1256 |
/** |
2 | 1257 |
* Reconstitute the Hashtable from a stream (i.e., deserialize it). |
1258 |
*/ |
|
57956
e0b8b019d2f5
8229997: Apply java.io.Serial annotations in java.base
darcy
parents:
52427
diff
changeset
|
1259 |
@java.io.Serial |
2 | 1260 |
private void readObject(java.io.ObjectInputStream s) |
38436
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1261 |
throws IOException, ClassNotFoundException { |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1262 |
readHashtable(s); |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1263 |
} |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1264 |
|
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1265 |
/** |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1266 |
* Perform deserialization of the Hashtable from an ObjectInputStream. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1267 |
* The Properties class overrides this method. |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1268 |
*/ |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1269 |
void readHashtable(java.io.ObjectInputStream s) |
4676f6c9ebee
8029891: Deadlock detected in java/lang/ClassLoader/deadlock/GetResource.java
bchristi
parents:
32108
diff
changeset
|
1270 |
throws IOException, ClassNotFoundException { |
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1271 |
// Read in the threshold and loadFactor |
2 | 1272 |
s.defaultReadObject(); |
1273 |
||
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1274 |
// Validate loadFactor (ignore threshold - it will be re-computed) |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1275 |
if (loadFactor <= 0 || Float.isNaN(loadFactor)) |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1276 |
throw new StreamCorruptedException("Illegal Load: " + loadFactor); |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1277 |
|
2 | 1278 |
// Read the original length of the array and number of elements |
1279 |
int origlength = s.readInt(); |
|
1280 |
int elements = s.readInt(); |
|
1281 |
||
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1282 |
// Validate # of elements |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1283 |
if (elements < 0) |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1284 |
throw new StreamCorruptedException("Illegal # of Elements: " + elements); |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1285 |
|
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1286 |
// Clamp original length to be more than elements / loadFactor |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1287 |
// (this is the invariant enforced with auto-growth) |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1288 |
origlength = Math.max(origlength, (int)(elements / loadFactor) + 1); |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1289 |
|
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1290 |
// Compute new length with a bit of room 5% + 3 to grow but |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1291 |
// no larger than the clamped original length. Make the length |
2 | 1292 |
// odd if it's large enough, this helps distribute the entries. |
1293 |
// Guard against the length ending up zero, that's not valid. |
|
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1294 |
int length = (int)((elements + elements / 20) / loadFactor) + 3; |
2 | 1295 |
if (length > elements && (length & 1) == 0) |
1296 |
length--; |
|
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1297 |
length = Math.min(length, origlength); |
47423 | 1298 |
|
49774 | 1299 |
if (length < 0) { // overflow |
1300 |
length = origlength; |
|
1301 |
} |
|
1302 |
||
47423 | 1303 |
// Check Map.Entry[].class since it's the nearest public type to |
1304 |
// what we're actually creating. |
|
1305 |
SharedSecrets.getJavaObjectInputStreamAccess().checkArray(s, Map.Entry[].class, length); |
|
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
1306 |
table = new Entry<?,?>[length]; |
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
1307 |
threshold = (int)Math.min(length * loadFactor, MAX_ARRAY_SIZE + 1); |
2 | 1308 |
count = 0; |
1309 |
||
1310 |
// Read the number of elements and then all the key/value objects |
|
1311 |
for (; elements > 0; elements--) { |
|
12448 | 1312 |
@SuppressWarnings("unchecked") |
1313 |
K key = (K)s.readObject(); |
|
1314 |
@SuppressWarnings("unchecked") |
|
1315 |
V value = (V)s.readObject(); |
|
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1316 |
// sync is eliminated for performance |
2 | 1317 |
reconstitutionPut(table, key, value); |
1318 |
} |
|
1319 |
} |
|
1320 |
||
1321 |
/** |
|
1322 |
* The put method used by readObject. This is provided because put |
|
1323 |
* is overridable and should not be called in readObject since the |
|
1324 |
* subclass will not yet be initialized. |
|
1325 |
* |
|
1326 |
* <p>This differs from the regular put method in several ways. No |
|
1327 |
* checking for rehashing is necessary since the number of elements |
|
28559
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1328 |
* initially in the table is known. The modCount is not incremented and |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1329 |
* there's no synchronization because we are creating a new instance. |
e4d6d177eef0
8068427: Hashtable deserialization reconstitutes table with wrong capacity
plevart
parents:
25859
diff
changeset
|
1330 |
* Also, no return value is needed. |
2 | 1331 |
*/ |
12448 | 1332 |
private void reconstitutionPut(Entry<?,?>[] tab, K key, V value) |
2 | 1333 |
throws StreamCorruptedException |
1334 |
{ |
|
1335 |
if (value == null) { |
|
1336 |
throw new java.io.StreamCorruptedException(); |
|
1337 |
} |
|
1338 |
// Makes sure the key is not already in the hashtable. |
|
1339 |
// This should not happen in deserialized version. |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1340 |
int hash = key.hashCode(); |
2 | 1341 |
int index = (hash & 0x7FFFFFFF) % tab.length; |
12448 | 1342 |
for (Entry<?,?> e = tab[index] ; e != null ; e = e.next) { |
2 | 1343 |
if ((e.hash == hash) && e.key.equals(key)) { |
1344 |
throw new java.io.StreamCorruptedException(); |
|
1345 |
} |
|
1346 |
} |
|
1347 |
// Creates the new entry. |
|
12448 | 1348 |
@SuppressWarnings("unchecked") |
1349 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
1350 |
tab[index] = new Entry<>(hash, key, value, e); |
2 | 1351 |
count++; |
1352 |
} |
|
1353 |
||
1354 |
/** |
|
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
1355 |
* Hashtable bucket collision list entry |
2 | 1356 |
*/ |
1357 |
private static class Entry<K,V> implements Map.Entry<K,V> { |
|
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
1358 |
final int hash; |
13018 | 1359 |
final K key; |
2 | 1360 |
V value; |
1361 |
Entry<K,V> next; |
|
1362 |
||
1363 |
protected Entry(int hash, K key, V value, Entry<K,V> next) { |
|
1364 |
this.hash = hash; |
|
12859
c44b88bb9b5e
7126277: Alternative String hashing implementation
mduigou
parents:
12448
diff
changeset
|
1365 |
this.key = key; |
2 | 1366 |
this.value = value; |
1367 |
this.next = next; |
|
1368 |
} |
|
1369 |
||
12448 | 1370 |
@SuppressWarnings("unchecked") |
2 | 1371 |
protected Object clone() { |
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
1372 |
return new Entry<>(hash, key, value, |
2 | 1373 |
(next==null ? null : (Entry<K,V>) next.clone())); |
1374 |
} |
|
1375 |
||
1376 |
// Map.Entry Ops |
|
1377 |
||
1378 |
public K getKey() { |
|
1379 |
return key; |
|
1380 |
} |
|
1381 |
||
1382 |
public V getValue() { |
|
1383 |
return value; |
|
1384 |
} |
|
1385 |
||
1386 |
public V setValue(V value) { |
|
1387 |
if (value == null) |
|
1388 |
throw new NullPointerException(); |
|
1389 |
||
1390 |
V oldValue = this.value; |
|
1391 |
this.value = value; |
|
1392 |
return oldValue; |
|
1393 |
} |
|
1394 |
||
1395 |
public boolean equals(Object o) { |
|
1396 |
if (!(o instanceof Map.Entry)) |
|
1397 |
return false; |
|
12448 | 1398 |
Map.Entry<?,?> e = (Map.Entry<?,?>)o; |
2 | 1399 |
|
1400 |
return (key==null ? e.getKey()==null : key.equals(e.getKey())) && |
|
1401 |
(value==null ? e.getValue()==null : value.equals(e.getValue())); |
|
1402 |
} |
|
1403 |
||
1404 |
public int hashCode() { |
|
19853
832b09e2714c
8024009: Remove jdk.map.useRandomSeed system property
bchristi
parents:
19208
diff
changeset
|
1405 |
return hash ^ Objects.hashCode(value); |
2 | 1406 |
} |
1407 |
||
1408 |
public String toString() { |
|
1409 |
return key.toString()+"="+value.toString(); |
|
1410 |
} |
|
1411 |
} |
|
1412 |
||
1413 |
// Types of Enumerations/Iterations |
|
1414 |
private static final int KEYS = 0; |
|
1415 |
private static final int VALUES = 1; |
|
1416 |
private static final int ENTRIES = 2; |
|
1417 |
||
1418 |
/** |
|
1419 |
* A hashtable enumerator class. This class implements both the |
|
1420 |
* Enumeration and Iterator interfaces, but individual instances |
|
1421 |
* can be created with the Iterator methods disabled. This is necessary |
|
1422 |
* to avoid unintentionally increasing the capabilities granted a user |
|
1423 |
* by passing an Enumeration. |
|
1424 |
*/ |
|
1425 |
private class Enumerator<T> implements Enumeration<T>, Iterator<T> { |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1426 |
final Entry<?,?>[] table = Hashtable.this.table; |
2 | 1427 |
int index = table.length; |
23746 | 1428 |
Entry<?,?> entry; |
1429 |
Entry<?,?> lastReturned; |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1430 |
final int type; |
2 | 1431 |
|
1432 |
/** |
|
1433 |
* Indicates whether this Enumerator is serving as an Iterator |
|
1434 |
* or an Enumeration. (true -> Iterator). |
|
1435 |
*/ |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1436 |
final boolean iterator; |
2 | 1437 |
|
1438 |
/** |
|
1439 |
* The modCount value that the iterator believes that the backing |
|
1440 |
* Hashtable should have. If this expectation is violated, the iterator |
|
1441 |
* has detected concurrent modification. |
|
1442 |
*/ |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1443 |
protected int expectedModCount = Hashtable.this.modCount; |
2 | 1444 |
|
1445 |
Enumerator(int type, boolean iterator) { |
|
1446 |
this.type = type; |
|
1447 |
this.iterator = iterator; |
|
1448 |
} |
|
1449 |
||
1450 |
public boolean hasMoreElements() { |
|
12448 | 1451 |
Entry<?,?> e = entry; |
2 | 1452 |
int i = index; |
12448 | 1453 |
Entry<?,?>[] t = table; |
2 | 1454 |
/* Use locals for faster loop iteration */ |
1455 |
while (e == null && i > 0) { |
|
1456 |
e = t[--i]; |
|
1457 |
} |
|
1458 |
entry = e; |
|
1459 |
index = i; |
|
1460 |
return e != null; |
|
1461 |
} |
|
1462 |
||
12448 | 1463 |
@SuppressWarnings("unchecked") |
2 | 1464 |
public T nextElement() { |
12448 | 1465 |
Entry<?,?> et = entry; |
2 | 1466 |
int i = index; |
12448 | 1467 |
Entry<?,?>[] t = table; |
2 | 1468 |
/* Use locals for faster loop iteration */ |
1469 |
while (et == null && i > 0) { |
|
1470 |
et = t[--i]; |
|
1471 |
} |
|
1472 |
entry = et; |
|
1473 |
index = i; |
|
1474 |
if (et != null) { |
|
12448 | 1475 |
Entry<?,?> e = lastReturned = entry; |
2 | 1476 |
entry = e.next; |
1477 |
return type == KEYS ? (T)e.key : (type == VALUES ? (T)e.value : (T)e); |
|
1478 |
} |
|
1479 |
throw new NoSuchElementException("Hashtable Enumerator"); |
|
1480 |
} |
|
1481 |
||
1482 |
// Iterator methods |
|
1483 |
public boolean hasNext() { |
|
1484 |
return hasMoreElements(); |
|
1485 |
} |
|
1486 |
||
1487 |
public T next() { |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1488 |
if (Hashtable.this.modCount != expectedModCount) |
2 | 1489 |
throw new ConcurrentModificationException(); |
1490 |
return nextElement(); |
|
1491 |
} |
|
1492 |
||
1493 |
public void remove() { |
|
1494 |
if (!iterator) |
|
1495 |
throw new UnsupportedOperationException(); |
|
1496 |
if (lastReturned == null) |
|
1497 |
throw new IllegalStateException("Hashtable Enumerator"); |
|
1498 |
if (modCount != expectedModCount) |
|
1499 |
throw new ConcurrentModificationException(); |
|
1500 |
||
1501 |
synchronized(Hashtable.this) { |
|
12448 | 1502 |
Entry<?,?>[] tab = Hashtable.this.table; |
2 | 1503 |
int index = (lastReturned.hash & 0x7FFFFFFF) % tab.length; |
1504 |
||
12448 | 1505 |
@SuppressWarnings("unchecked") |
1506 |
Entry<K,V> e = (Entry<K,V>)tab[index]; |
|
1507 |
for(Entry<K,V> prev = null; e != null; prev = e, e = e.next) { |
|
2 | 1508 |
if (e == lastReturned) { |
1509 |
if (prev == null) |
|
1510 |
tab[index] = e.next; |
|
1511 |
else |
|
1512 |
prev.next = e.next; |
|
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1513 |
expectedModCount++; |
2 | 1514 |
lastReturned = null; |
24255
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1515 |
Hashtable.this.modCount++; |
91f5e4399160
8020860: cluster Hashtable/Vector field updates for better transactional memory behaviour
mduigou
parents:
23746
diff
changeset
|
1516 |
Hashtable.this.count--; |
2 | 1517 |
return; |
1518 |
} |
|
1519 |
} |
|
1520 |
throw new ConcurrentModificationException(); |
|
1521 |
} |
|
1522 |
} |
|
1523 |
} |
|
1524 |
} |