author | mchung |
Tue, 06 Nov 2018 10:01:16 -0800 | |
changeset 52427 | 3c6aa484536c |
parent 49433 | b6671a111395 |
child 52887 | 0d89f672c62e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
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package java.util; |
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import jdk.internal.access.SharedSecrets; |
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/** |
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* A specialized {@link Set} implementation for use with enum types. All of |
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* the elements in an enum set must come from a single enum type that is |
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* specified, explicitly or implicitly, when the set is created. Enum sets |
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* are represented internally as bit vectors. This representation is |
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* extremely compact and efficient. The space and time performance of this |
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* class should be good enough to allow its use as a high-quality, typesafe |
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* alternative to traditional {@code int}-based "bit flags." Even bulk |
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* operations (such as {@code containsAll} and {@code retainAll}) should |
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* run very quickly if their argument is also an enum set. |
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* |
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* <p>The iterator returned by the {@code iterator} method traverses the |
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* elements in their <i>natural order</i> (the order in which the enum |
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* constants are declared). The returned iterator is <i>weakly |
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* consistent</i>: it will never throw {@link ConcurrentModificationException} |
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* and it may or may not show the effects of any modifications to the set that |
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* occur while the iteration is in progress. |
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* |
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* <p>Null elements are not permitted. Attempts to insert a null element |
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* will throw {@link NullPointerException}. Attempts to test for the |
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* presence of a null element or to remove one will, however, function |
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* properly. |
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* |
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* <P>Like most collection implementations, {@code EnumSet} is not |
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* synchronized. If multiple threads access an enum set concurrently, and at |
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* least one of the threads modifies the set, it should be synchronized |
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* externally. This is typically accomplished by synchronizing on some |
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* object that naturally encapsulates the enum set. If no such object exists, |
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* the set should be "wrapped" using the {@link Collections#synchronizedSet} |
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* method. This is best done at creation time, to prevent accidental |
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* unsynchronized access: |
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* |
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* <pre> |
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* Set<MyEnum> s = Collections.synchronizedSet(EnumSet.noneOf(MyEnum.class)); |
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* </pre> |
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* |
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* <p>Implementation note: All basic operations execute in constant time. |
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* They are likely (though not guaranteed) to be much faster than their |
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* {@link HashSet} counterparts. Even bulk operations execute in |
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* constant time if their argument is also an enum set. |
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* |
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* <p>This class is a member of the |
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* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework"> |
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* Java Collections Framework</a>. |
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* |
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* @author Josh Bloch |
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* @since 1.5 |
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* @see EnumMap |
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*/ |
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@SuppressWarnings("serial") // No serialVersionUID due to usage of |
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// serial proxy pattern |
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public abstract class EnumSet<E extends Enum<E>> extends AbstractSet<E> |
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implements Cloneable, java.io.Serializable |
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{ |
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/** |
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* The class of all the elements of this set. |
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*/ |
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final transient Class<E> elementType; |
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/** |
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* All of the values comprising E. (Cached for performance.) |
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*/ |
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final transient Enum<?>[] universe; |
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EnumSet(Class<E>elementType, Enum<?>[] universe) { |
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this.elementType = elementType; |
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this.universe = universe; |
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} |
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/** |
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* Creates an empty enum set with the specified element type. |
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* |
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* @param <E> The class of the elements in the set |
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* @param elementType the class object of the element type for this enum |
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* set |
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* @return An empty enum set of the specified type. |
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* @throws NullPointerException if {@code elementType} is null |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType) { |
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Enum<?>[] universe = getUniverse(elementType); |
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if (universe == null) |
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throw new ClassCastException(elementType + " not an enum"); |
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if (universe.length <= 64) |
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return new RegularEnumSet<>(elementType, universe); |
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else |
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return new JumboEnumSet<>(elementType, universe); |
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} |
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/** |
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* Creates an enum set containing all of the elements in the specified |
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* element type. |
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* |
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* @param <E> The class of the elements in the set |
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* @param elementType the class object of the element type for this enum |
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* set |
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* @return An enum set containing all the elements in the specified type. |
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* @throws NullPointerException if {@code elementType} is null |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) { |
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EnumSet<E> result = noneOf(elementType); |
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result.addAll(); |
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return result; |
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} |
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/** |
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* Adds all of the elements from the appropriate enum type to this enum |
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* set, which is empty prior to the call. |
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*/ |
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abstract void addAll(); |
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/** |
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* Creates an enum set with the same element type as the specified enum |
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* set, initially containing the same elements (if any). |
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* |
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* @param <E> The class of the elements in the set |
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* @param s the enum set from which to initialize this enum set |
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* @return A copy of the specified enum set. |
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* @throws NullPointerException if {@code s} is null |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> copyOf(EnumSet<E> s) { |
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return s.clone(); |
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} |
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/** |
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* Creates an enum set initialized from the specified collection. If |
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* the specified collection is an {@code EnumSet} instance, this static |
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* factory method behaves identically to {@link #copyOf(EnumSet)}. |
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* Otherwise, the specified collection must contain at least one element |
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* (in order to determine the new enum set's element type). |
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* |
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* @param <E> The class of the elements in the collection |
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* @param c the collection from which to initialize this enum set |
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* @return An enum set initialized from the given collection. |
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* @throws IllegalArgumentException if {@code c} is not an |
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* {@code EnumSet} instance and contains no elements |
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* @throws NullPointerException if {@code c} is null |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> copyOf(Collection<E> c) { |
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if (c instanceof EnumSet) { |
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return ((EnumSet<E>)c).clone(); |
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} else { |
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if (c.isEmpty()) |
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throw new IllegalArgumentException("Collection is empty"); |
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Iterator<E> i = c.iterator(); |
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E first = i.next(); |
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EnumSet<E> result = EnumSet.of(first); |
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while (i.hasNext()) |
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result.add(i.next()); |
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return result; |
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} |
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} |
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/** |
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* Creates an enum set with the same element type as the specified enum |
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* set, initially containing all the elements of this type that are |
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* <i>not</i> contained in the specified set. |
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* |
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* @param <E> The class of the elements in the enum set |
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* @param s the enum set from whose complement to initialize this enum set |
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* @return The complement of the specified set in this set |
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* @throws NullPointerException if {@code s} is null |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> complementOf(EnumSet<E> s) { |
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EnumSet<E> result = copyOf(s); |
|
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result.complement(); |
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return result; |
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} |
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/** |
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* Creates an enum set initially containing the specified element. |
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* |
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* Overloadings of this method exist to initialize an enum set with |
|
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* one through five elements. A sixth overloading is provided that |
|
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* uses the varargs feature. This overloading may be used to create |
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* an enum set initially containing an arbitrary number of elements, but |
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* is likely to run slower than the overloadings that do not use varargs. |
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* |
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* @param <E> The class of the specified element and of the set |
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* @param e the element that this set is to contain initially |
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* @throws NullPointerException if {@code e} is null |
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* @return an enum set initially containing the specified element |
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*/ |
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public static <E extends Enum<E>> EnumSet<E> of(E e) { |
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EnumSet<E> result = noneOf(e.getDeclaringClass()); |
|
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result.add(e); |
|
216 |
return result; |
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} |
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||
219 |
/** |
|
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* Creates an enum set initially containing the specified elements. |
|
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* |
|
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* Overloadings of this method exist to initialize an enum set with |
|
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* one through five elements. A sixth overloading is provided that |
|
224 |
* uses the varargs feature. This overloading may be used to create |
|
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* an enum set initially containing an arbitrary number of elements, but |
|
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* is likely to run slower than the overloadings that do not use varargs. |
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* |
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* @param <E> The class of the parameter elements and of the set |
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* @param e1 an element that this set is to contain initially |
230 |
* @param e2 another element that this set is to contain initially |
|
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* @throws NullPointerException if any parameters are null |
|
232 |
* @return an enum set initially containing the specified elements |
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*/ |
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234 |
public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2) { |
|
235 |
EnumSet<E> result = noneOf(e1.getDeclaringClass()); |
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result.add(e1); |
|
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result.add(e2); |
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return result; |
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239 |
} |
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240 |
||
241 |
/** |
|
242 |
* Creates an enum set initially containing the specified elements. |
|
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* |
|
244 |
* Overloadings of this method exist to initialize an enum set with |
|
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* one through five elements. A sixth overloading is provided that |
|
246 |
* uses the varargs feature. This overloading may be used to create |
|
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* an enum set initially containing an arbitrary number of elements, but |
|
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* is likely to run slower than the overloadings that do not use varargs. |
|
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* |
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* @param <E> The class of the parameter elements and of the set |
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* @param e1 an element that this set is to contain initially |
252 |
* @param e2 another element that this set is to contain initially |
|
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* @param e3 another element that this set is to contain initially |
|
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* @throws NullPointerException if any parameters are null |
|
255 |
* @return an enum set initially containing the specified elements |
|
256 |
*/ |
|
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public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3) { |
|
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EnumSet<E> result = noneOf(e1.getDeclaringClass()); |
|
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result.add(e1); |
|
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result.add(e2); |
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result.add(e3); |
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return result; |
|
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} |
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264 |
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265 |
/** |
|
266 |
* Creates an enum set initially containing the specified elements. |
|
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* |
|
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* Overloadings of this method exist to initialize an enum set with |
|
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* one through five elements. A sixth overloading is provided that |
|
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* uses the varargs feature. This overloading may be used to create |
|
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* an enum set initially containing an arbitrary number of elements, but |
|
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* is likely to run slower than the overloadings that do not use varargs. |
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* |
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* @param <E> The class of the parameter elements and of the set |
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* @param e1 an element that this set is to contain initially |
276 |
* @param e2 another element that this set is to contain initially |
|
277 |
* @param e3 another element that this set is to contain initially |
|
278 |
* @param e4 another element that this set is to contain initially |
|
279 |
* @throws NullPointerException if any parameters are null |
|
280 |
* @return an enum set initially containing the specified elements |
|
281 |
*/ |
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282 |
public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4) { |
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283 |
EnumSet<E> result = noneOf(e1.getDeclaringClass()); |
|
284 |
result.add(e1); |
|
285 |
result.add(e2); |
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286 |
result.add(e3); |
|
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result.add(e4); |
|
288 |
return result; |
|
289 |
} |
|
290 |
||
291 |
/** |
|
292 |
* Creates an enum set initially containing the specified elements. |
|
293 |
* |
|
294 |
* Overloadings of this method exist to initialize an enum set with |
|
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* one through five elements. A sixth overloading is provided that |
|
296 |
* uses the varargs feature. This overloading may be used to create |
|
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* an enum set initially containing an arbitrary number of elements, but |
|
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* is likely to run slower than the overloadings that do not use varargs. |
|
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* |
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* @param <E> The class of the parameter elements and of the set |
2 | 301 |
* @param e1 an element that this set is to contain initially |
302 |
* @param e2 another element that this set is to contain initially |
|
303 |
* @param e3 another element that this set is to contain initially |
|
304 |
* @param e4 another element that this set is to contain initially |
|
305 |
* @param e5 another element that this set is to contain initially |
|
306 |
* @throws NullPointerException if any parameters are null |
|
307 |
* @return an enum set initially containing the specified elements |
|
308 |
*/ |
|
309 |
public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4, |
|
310 |
E e5) |
|
311 |
{ |
|
312 |
EnumSet<E> result = noneOf(e1.getDeclaringClass()); |
|
313 |
result.add(e1); |
|
314 |
result.add(e2); |
|
315 |
result.add(e3); |
|
316 |
result.add(e4); |
|
317 |
result.add(e5); |
|
318 |
return result; |
|
319 |
} |
|
320 |
||
321 |
/** |
|
322 |
* Creates an enum set initially containing the specified elements. |
|
323 |
* This factory, whose parameter list uses the varargs feature, may |
|
324 |
* be used to create an enum set initially containing an arbitrary |
|
325 |
* number of elements, but it is likely to run slower than the overloadings |
|
326 |
* that do not use varargs. |
|
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* |
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* @param <E> The class of the parameter elements and of the set |
2 | 329 |
* @param first an element that the set is to contain initially |
330 |
* @param rest the remaining elements the set is to contain initially |
|
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* @throws NullPointerException if any of the specified elements are null, |
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* or if {@code rest} is null |
2 | 333 |
* @return an enum set initially containing the specified elements |
334 |
*/ |
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@SafeVarargs |
2 | 336 |
public static <E extends Enum<E>> EnumSet<E> of(E first, E... rest) { |
337 |
EnumSet<E> result = noneOf(first.getDeclaringClass()); |
|
338 |
result.add(first); |
|
339 |
for (E e : rest) |
|
340 |
result.add(e); |
|
341 |
return result; |
|
342 |
} |
|
343 |
||
344 |
/** |
|
345 |
* Creates an enum set initially containing all of the elements in the |
|
346 |
* range defined by the two specified endpoints. The returned set will |
|
347 |
* contain the endpoints themselves, which may be identical but must not |
|
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* be out of order. |
|
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* |
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* @param <E> The class of the parameter elements and of the set |
2 | 351 |
* @param from the first element in the range |
352 |
* @param to the last element in the range |
|
353 |
* @throws NullPointerException if {@code from} or {@code to} are null |
|
354 |
* @throws IllegalArgumentException if {@code from.compareTo(to) > 0} |
|
355 |
* @return an enum set initially containing all of the elements in the |
|
356 |
* range defined by the two specified endpoints |
|
357 |
*/ |
|
358 |
public static <E extends Enum<E>> EnumSet<E> range(E from, E to) { |
|
359 |
if (from.compareTo(to) > 0) |
|
360 |
throw new IllegalArgumentException(from + " > " + to); |
|
361 |
EnumSet<E> result = noneOf(from.getDeclaringClass()); |
|
362 |
result.addRange(from, to); |
|
363 |
return result; |
|
364 |
} |
|
365 |
||
366 |
/** |
|
367 |
* Adds the specified range to this enum set, which is empty prior |
|
368 |
* to the call. |
|
369 |
*/ |
|
370 |
abstract void addRange(E from, E to); |
|
371 |
||
372 |
/** |
|
373 |
* Returns a copy of this set. |
|
374 |
* |
|
375 |
* @return a copy of this set |
|
376 |
*/ |
|
12448 | 377 |
@SuppressWarnings("unchecked") |
2 | 378 |
public EnumSet<E> clone() { |
379 |
try { |
|
380 |
return (EnumSet<E>) super.clone(); |
|
381 |
} catch(CloneNotSupportedException e) { |
|
382 |
throw new AssertionError(e); |
|
383 |
} |
|
384 |
} |
|
385 |
||
386 |
/** |
|
387 |
* Complements the contents of this enum set. |
|
388 |
*/ |
|
389 |
abstract void complement(); |
|
390 |
||
391 |
/** |
|
392 |
* Throws an exception if e is not of the correct type for this enum set. |
|
393 |
*/ |
|
394 |
final void typeCheck(E e) { |
|
12448 | 395 |
Class<?> eClass = e.getClass(); |
2 | 396 |
if (eClass != elementType && eClass.getSuperclass() != elementType) |
397 |
throw new ClassCastException(eClass + " != " + elementType); |
|
398 |
} |
|
399 |
||
400 |
/** |
|
401 |
* Returns all of the values comprising E. |
|
402 |
* The result is uncloned, cached, and shared by all callers. |
|
403 |
*/ |
|
404 |
private static <E extends Enum<E>> E[] getUniverse(Class<E> elementType) { |
|
405 |
return SharedSecrets.getJavaLangAccess() |
|
406 |
.getEnumConstantsShared(elementType); |
|
407 |
} |
|
408 |
||
409 |
/** |
|
410 |
* This class is used to serialize all EnumSet instances, regardless of |
|
411 |
* implementation type. It captures their "logical contents" and they |
|
412 |
* are reconstructed using public static factories. This is necessary |
|
413 |
* to ensure that the existence of a particular implementation type is |
|
414 |
* an implementation detail. |
|
415 |
* |
|
416 |
* @serial include |
|
417 |
*/ |
|
48230 | 418 |
private static class SerializationProxy<E extends Enum<E>> |
2 | 419 |
implements java.io.Serializable |
420 |
{ |
|
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|
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private static final Enum<?>[] ZERO_LENGTH_ENUM_ARRAY = new Enum<?>[0]; |
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423 |
|
2 | 424 |
/** |
425 |
* The element type of this enum set. |
|
426 |
* |
|
427 |
* @serial |
|
428 |
*/ |
|
429 |
private final Class<E> elementType; |
|
430 |
||
431 |
/** |
|
432 |
* The elements contained in this enum set. |
|
433 |
* |
|
434 |
* @serial |
|
435 |
*/ |
|
12448 | 436 |
private final Enum<?>[] elements; |
2 | 437 |
|
438 |
SerializationProxy(EnumSet<E> set) { |
|
439 |
elementType = set.elementType; |
|
440 |
elements = set.toArray(ZERO_LENGTH_ENUM_ARRAY); |
|
441 |
} |
|
442 |
||
48230 | 443 |
/** |
444 |
* Returns an {@code EnumSet} object with initial state |
|
445 |
* held by this proxy. |
|
446 |
* |
|
447 |
* @return a {@code EnumSet} object with initial state |
|
448 |
* held by this proxy |
|
449 |
*/ |
|
12448 | 450 |
@SuppressWarnings("unchecked") |
2 | 451 |
private Object readResolve() { |
48230 | 452 |
// instead of cast to E, we should perhaps use elementType.cast() |
453 |
// to avoid injection of forged stream, but it will slow the |
|
454 |
// implementation |
|
2 | 455 |
EnumSet<E> result = EnumSet.noneOf(elementType); |
12448 | 456 |
for (Enum<?> e : elements) |
2 | 457 |
result.add((E)e); |
458 |
return result; |
|
459 |
} |
|
460 |
||
461 |
private static final long serialVersionUID = 362491234563181265L; |
|
462 |
} |
|
463 |
||
48230 | 464 |
/** |
465 |
* Returns a |
|
466 |
* <a href="../../serialized-form.html#java.util.EnumSet.SerializationProxy"> |
|
467 |
* SerializationProxy</a> |
|
468 |
* representing the state of this instance. |
|
469 |
* |
|
470 |
* @return a {@link SerializationProxy} |
|
471 |
* representing the state of this instance |
|
472 |
*/ |
|
2 | 473 |
Object writeReplace() { |
7803
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|
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return new SerializationProxy<>(this); |
2 | 475 |
} |
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diff
changeset
|
476 |
|
48230 | 477 |
/** |
478 |
* @param s the stream |
|
479 |
* @throws java.io.InvalidObjectException always |
|
480 |
*/ |
|
481 |
private void readObject(java.io.ObjectInputStream s) |
|
1088
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changeset
|
482 |
throws java.io.InvalidObjectException { |
aa57bc6c9b3c
6739302: Check that deserialization preserves EnumSet integrity
martin
parents:
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diff
changeset
|
483 |
throw new java.io.InvalidObjectException("Proxy required"); |
aa57bc6c9b3c
6739302: Check that deserialization preserves EnumSet integrity
martin
parents:
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diff
changeset
|
484 |
} |
2 | 485 |
} |