author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 3065 | 452aaa2899fc |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.nio.fs; |
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|
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import java.nio.file.*; |
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import java.util.Iterator; |
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import java.util.ConcurrentModificationException; |
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import java.util.NoSuchElementException; |
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import java.util.concurrent.locks.*; |
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import java.io.IOException; |
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import static sun.nio.fs.UnixNativeDispatcher.*; |
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/** |
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* Unix implementation of java.nio.file.DirectoryStream |
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*/ |
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|
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class UnixDirectoryStream |
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implements DirectoryStream<Path> |
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{ |
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// path to directory when originally opened |
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private final UnixPath dir; |
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// directory pointer (returned by opendir) |
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private final long dp; |
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// filter (may be null) |
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private final DirectoryStream.Filter<? super Path> filter; |
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// used to coorindate closing of directory stream |
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private final ReentrantReadWriteLock streamLock = |
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new ReentrantReadWriteLock(true); |
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// indicates if directory stream is open (synchronize on closeLock) |
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private volatile boolean isClosed; |
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// directory iterator |
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private Iterator<Path> iterator; |
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/** |
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* Initializes a new instance |
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*/ |
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UnixDirectoryStream(UnixPath dir, long dp, DirectoryStream.Filter<? super Path> filter) { |
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this.dir = dir; |
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this.dp = dp; |
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this.filter = filter; |
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} |
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protected final UnixPath directory() { |
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return dir; |
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} |
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protected final Lock readLock() { |
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return streamLock.readLock(); |
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} |
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protected final Lock writeLock() { |
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return streamLock.writeLock(); |
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} |
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protected final boolean isOpen() { |
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return !isClosed; |
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} |
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protected final boolean closeImpl() throws IOException { |
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if (!isClosed) { |
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isClosed = true; |
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try { |
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closedir(dp); |
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} catch (UnixException x) { |
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throw new IOException(x.errorString()); |
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} |
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return true; |
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} else { |
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return false; |
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} |
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} |
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|
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@Override |
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public void close() |
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throws IOException |
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{ |
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writeLock().lock(); |
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try { |
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closeImpl(); |
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} finally { |
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writeLock().unlock(); |
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} |
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} |
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protected final Iterator<Path> iterator(DirectoryStream<Path> ds) { |
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if (isClosed) { |
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throw new IllegalStateException("Directory stream is closed"); |
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} |
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synchronized (this) { |
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if (iterator != null) |
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throw new IllegalStateException("Iterator already obtained"); |
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iterator = new UnixDirectoryIterator(ds); |
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return iterator; |
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122 |
} |
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123 |
} |
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124 |
|
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125 |
@Override |
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126 |
public Iterator<Path> iterator() { |
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127 |
return iterator(this); |
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128 |
} |
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129 |
|
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130 |
/** |
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131 |
* Iterator implementation |
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132 |
*/ |
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133 |
private class UnixDirectoryIterator implements Iterator<Path> { |
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134 |
private final DirectoryStream<Path> stream; |
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135 |
|
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136 |
// true when at EOF |
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137 |
private boolean atEof; |
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138 |
|
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139 |
// next entry to return |
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140 |
private Path nextEntry; |
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141 |
|
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142 |
// previous entry returned by next method (needed by remove method) |
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143 |
private Path prevEntry; |
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144 |
|
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145 |
UnixDirectoryIterator(DirectoryStream<Path> stream) { |
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146 |
atEof = false; |
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147 |
this.stream = stream; |
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148 |
} |
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149 |
|
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150 |
// Return true if file name is "." or ".." |
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151 |
private boolean isSelfOrParent(byte[] nameAsBytes) { |
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152 |
if (nameAsBytes[0] == '.') { |
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153 |
if ((nameAsBytes.length == 1) || |
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154 |
(nameAsBytes.length == 2 && nameAsBytes[1] == '.')) { |
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|
155 |
return true; |
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|
156 |
} |
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|
157 |
} |
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|
158 |
return false; |
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|
159 |
} |
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|
160 |
|
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|
161 |
// Returns next entry (or null) |
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|
162 |
private Path readNextEntry() { |
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|
163 |
assert Thread.holdsLock(this); |
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|
164 |
|
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|
165 |
for (;;) { |
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|
166 |
byte[] nameAsBytes = null; |
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|
167 |
|
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|
168 |
// prevent close while reading |
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|
169 |
readLock().lock(); |
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|
170 |
try { |
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|
171 |
if (isClosed) |
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|
172 |
throwAsConcurrentModificationException(new |
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|
173 |
ClosedDirectoryStreamException()); |
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|
174 |
try { |
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|
175 |
nameAsBytes = readdir(dp); |
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|
176 |
} catch (UnixException x) { |
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|
177 |
try { |
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|
178 |
x.rethrowAsIOException(dir); |
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|
179 |
} catch (IOException ioe) { |
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|
180 |
throwAsConcurrentModificationException(ioe); |
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|
181 |
} |
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|
182 |
} |
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|
183 |
} finally { |
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|
184 |
readLock().unlock(); |
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|
185 |
} |
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|
186 |
|
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|
187 |
// EOF |
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|
188 |
if (nameAsBytes == null) { |
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|
189 |
return null; |
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|
190 |
} |
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|
191 |
|
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|
192 |
// ignore "." and ".." |
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|
193 |
if (!isSelfOrParent(nameAsBytes)) { |
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|
194 |
Path entry = dir.resolve(nameAsBytes); |
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|
195 |
|
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|
196 |
// return entry if no filter or filter accepts it |
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|
197 |
if (filter.accept(entry)) { |
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|
198 |
return entry; |
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|
199 |
} |
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|
200 |
} |
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|
201 |
} |
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|
202 |
} |
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|
203 |
|
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|
204 |
@Override |
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|
205 |
public synchronized boolean hasNext() { |
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|
206 |
if (nextEntry == null && !atEof) { |
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|
207 |
nextEntry = readNextEntry(); |
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|
208 |
|
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|
209 |
// at EOF? |
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|
210 |
if (nextEntry == null) |
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|
211 |
atEof = true; |
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|
212 |
} |
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|
213 |
return nextEntry != null; |
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|
214 |
} |
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|
215 |
|
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|
216 |
@Override |
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|
217 |
public synchronized Path next() { |
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|
218 |
if (nextEntry == null) { |
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|
219 |
if (!atEof) { |
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|
220 |
nextEntry = readNextEntry(); |
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|
221 |
} |
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|
222 |
if (nextEntry == null) { |
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|
223 |
atEof = true; |
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|
224 |
throw new NoSuchElementException(); |
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|
225 |
} |
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|
226 |
} |
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|
227 |
prevEntry = nextEntry; |
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|
228 |
nextEntry = null; |
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|
229 |
return prevEntry; |
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|
230 |
} |
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|
231 |
|
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|
232 |
@Override |
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|
233 |
public void remove() { |
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|
234 |
if (isClosed) { |
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|
235 |
throw new ClosedDirectoryStreamException(); |
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|
236 |
} |
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|
237 |
Path entry; |
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|
238 |
synchronized (this) { |
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if (prevEntry == null) |
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throw new IllegalStateException("No previous entry to remove"); |
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entry = prevEntry; |
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prevEntry = null; |
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} |
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244 |
|
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// use (race-free) unlinkat if available |
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try { |
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if (stream instanceof UnixSecureDirectoryStream) { |
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((UnixSecureDirectoryStream)stream) |
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.implDelete(entry.getName(), false, 0); |
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} else { |
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entry.delete(true); |
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} |
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} catch (IOException ioe) { |
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throwAsConcurrentModificationException(ioe); |
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} catch (SecurityException se) { |
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throwAsConcurrentModificationException(se); |
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} |
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} |
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} |
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|
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private static void throwAsConcurrentModificationException(Throwable t) { |
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ConcurrentModificationException cme = new ConcurrentModificationException(); |
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cme.initCause(t); |
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throw cme; |
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} |
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266 |
|
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} |