author | alanb |
Fri, 28 Jan 2011 09:28:43 +0000 | |
changeset 8158 | 77d9c0f1c19f |
parent 7668 | d4a77089c587 |
child 9035 | 1255eb81cc2f |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2010, 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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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 the convenient use of the for-each construct to iterate over a |
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* directory. |
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* |
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* <p> <b> While {@code DirectoryStream} extends {@code Iterable}, it is not a |
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* general-purpose {@code Iterable} as it supports only a single {@code |
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* Iterator}; invoking the {@link #iterator iterator} method to obtain a second |
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* or subsequent iterator throws {@code IllegalStateException}. </b> |
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* |
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* <p> An important property of the directory stream's {@code Iterator} is that |
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* its {@link Iterator#hasNext() hasNext} method is guaranteed to read-ahead by |
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* at least one element. If {@code hasNext} method returns {@code true}, and is |
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* followed by a call to the {@code next} method, it is guaranteed that the |
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* {@code next} method will not throw an exception due to an I/O error, or |
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* because the stream has been {@link #close closed}. The {@code Iterator} does |
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* not support the {@link Iterator#remove remove} operation. |
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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 {@code close} method. Closing a directory stream releases any |
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* resources associated with the stream. Failure to close the stream may result |
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* in a resource leak. The try-with-resources statement provides a useful |
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* construct to ensure that the stream is closed: |
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* <pre> |
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* Path dir = ... |
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* try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir)) { |
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* for (Path entry: stream) { |
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* ... |
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* } |
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* } |
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* </pre> |
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* |
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* <p> Once a directory stream is closed, then further access to the directory, |
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* using the {@code Iterator}, behaves as if the end of stream has been reached. |
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* Due to read-ahead, the {@code Iterator} may return one or more elements |
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* after the directory stream has been closed. Once these buffered elements |
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* have been read, then subsequent calls to the {@code hasNext} method returns |
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* {@code false}, and subsequent calls to the {@code next} method will throw |
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* {@code NoSuchElementException}. |
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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> If an I/O error is encountered when accessing the directory then it |
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* causes the {@code Iterator}'s {@code hasNext} or {@code next} methods to |
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* throw {@link DirectoryIteratorException} with the {@link IOException} as the |
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* cause. As stated above, the {@code hasNext} method is guaranteed to |
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* read-ahead by at least one element. This means that if {@code hasNext} method |
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* returns {@code true}, and is followed by a call to the {@code next} method, |
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* then it is guaranteed that the {@code next} method will not fail with a |
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* {@code DirectoryIteratorException}. |
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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 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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* <p> <b>Usage Examples:</b> |
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* Suppose we want a list of the source files in a directory. This example uses |
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* both the for-each and try-with-resources constructs. |
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* <pre> |
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* List<Path> listSourceFiles(Path dir) throws IOException { |
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* List<Path> result = new ArrayList<>(); |
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* try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir, "*.{c,h,cpp,hpp,java}")) { |
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* for (Path entry: stream) { |
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* result.add(entry); |
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* } |
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* } catch (DirectoryIteratorException ex) { |
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* // I/O error encounted during the iteration, the cause is an IOException |
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* throw ex.getCause(); |
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* } |
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* return result; |
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* } |
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* </pre> |
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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 Files#newDirectoryStream(Path) |
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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 Files#newDirectoryStream(Path,DirectoryStream.Filter)} |
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* method when opening a directory to iterate over the entries in the |
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* 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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} |