author | martin |
Wed, 29 Jul 2009 13:56:15 -0700 | |
changeset 3419 | 3ae6dc68c20d |
parent 3065 | 452aaa2899fc |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2007-2009 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 java.nio.file; |
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|
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import java.util.Iterator; |
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import java.io.Closeable; |
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import java.io.IOException; |
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|
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/** |
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* An object to iterate over the entries in a directory. A directory stream |
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* allows for convenient use of the for-each construct: |
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* <pre> |
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* Path dir = ... |
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* DirectoryStream<Path> stream = dir.newDirectoryStream(); |
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* try { |
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* for (Path entry: stream) { |
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* .. |
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* } |
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* } finally { |
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* stream.close(); |
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* } |
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* </pre> |
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* |
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* <p><b> A {@code DirectoryStream} is not a general-purpose {@code Iterable}. |
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* While this interface extends {@code Iterable}, the {@code iterator} method |
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* may only be invoked once to obtain the iterator; a second, or subsequent, |
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* call to the {@code iterator} method throws {@code IllegalStateException}. </b> |
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* |
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* <p> A {@code DirectoryStream} is opened upon creation and is closed by |
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* invoking the {@link #close close} method. Closing the directory stream |
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* releases any resources associated with the stream. Once a directory stream |
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* is closed, all further method invocations on the iterator throw {@link |
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* java.util.ConcurrentModificationException} with cause {@link |
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* ClosedDirectoryStreamException}. |
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* |
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* <p> A directory stream is not required to be <i>asynchronously closeable</i>. |
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* If a thread is blocked on the directory stream's iterator reading from the |
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* directory, and another thread invokes the {@code close} method, then the |
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* second thread may block until the read operation is complete. |
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* |
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* <p> The {@link Iterator#hasNext() hasNext} and {@link Iterator#next() next} |
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* methods can encounter an I/O error when iterating over the directory in which |
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* case {@code ConcurrentModificationException} is thrown with cause |
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* {@link java.io.IOException}. The {@code hasNext} method is guaranteed to |
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* read-ahead by at least one element. This means that if the {@code hasNext} |
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* method returns {@code true} and is followed by a call to the {@code next} |
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* method then it is guaranteed not to fail with a {@code |
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* ConcurrentModificationException}. |
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* |
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* <p> The elements returned by the iterator are in no specific order. Some file |
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* systems maintain special links to the directory itself and the directory's |
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* parent directory. Entries representing these links are not returned by the |
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* iterator. |
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* |
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* <p> The iterator's {@link Iterator#remove() remove} method removes the |
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* directory entry for the last element returned by the iterator, as if by |
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* invoking the {@link Path#delete delete} method. If an I/O error or |
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* security exception occurs then {@code ConcurrentModificationException} is |
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* thrown with the cause. |
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* |
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* <p> The iterator is <i>weakly consistent</i>. It is thread safe but does not |
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* freeze the directory while iterating, so it may (or may not) reflect updates |
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* to the directory that occur after the {@code DirectoryStream} is created. |
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* |
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* @param <T> The type of element returned by the iterator |
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* |
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* @since 1.7 |
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* |
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* @see Path#newDirectoryStream |
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*/ |
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|
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public interface DirectoryStream<T> |
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extends Closeable, Iterable<T> |
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{ |
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/** |
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* An interface that is implemented by objects that decide if a directory |
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* entry should be accepted or filtered. A {@code Filter} is passed as the |
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* parameter to the {@link Path#newDirectoryStream(DirectoryStream.Filter) |
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* newDirectoryStream} method when opening a directory to iterate over the |
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* entries in the directory. |
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* |
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* @param <T> the type of the directory entry |
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* |
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* @since 1.7 |
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*/ |
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public static interface Filter<T> { |
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/** |
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* Decides if the given directory entry should be accepted or filtered. |
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* |
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* @param entry |
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* the directory entry to be tested |
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* |
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* @return {@code true} if the directory entry should be accepted |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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boolean accept(T entry) throws IOException; |
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} |
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|
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/** |
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* Returns the iterator associated with this {@code DirectoryStream}. |
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* |
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* @return the iterator associated with this {@code DirectoryStream} |
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* |
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* @throws IllegalStateException |
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* if this directory stream is closed or the iterator has already |
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* been returned |
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*/ |
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@Override |
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Iterator<T> iterator(); |
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} |