author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 2072 | 80dfe4469bbd |
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.nio.file.attribute.BasicFileAttributes; |
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import java.io.IOException; |
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|
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/** |
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* A visitor of files. An implementation of this interface is provided to the |
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* {@link Files#walkFileTree walkFileTree} utility method to visit each file |
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* in a tree. |
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* |
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* <p> <b>Usage Examples:</b> |
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* Suppose we want to delete a file tree. In that case, each directory should |
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* be deleted after the entries in the directory are deleted. |
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* <pre> |
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* Path start = ... |
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* Files.walkFileTree(start, new SimpleFileVisitor<Path>() { |
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* @Override |
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* public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) { |
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* try { |
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* file.delete(false); |
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* } catch (IOException exc) { |
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* // failed to delete |
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* } |
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* return FileVisitResult.CONTINUE; |
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* } |
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* @Override |
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* public FileVisitResult postVisitDirectory(Path dir, IOException e) { |
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* if (e == null) { |
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* try { |
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* dir.delete(false); |
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* } catch (IOException exc) { |
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* // failed to delete |
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* } |
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* } else { |
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* // directory iteration failed |
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* } |
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* return FileVisitResult.CONTINUE; |
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* } |
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* }); |
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* </pre> |
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* <p> Furthermore, suppose we want to copy a file tree rooted at a source |
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* directory to a target location. In that case, symbolic links should be |
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* followed and the target directory should be created before the entries in |
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* the directory are copied. |
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* <pre> |
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* final Path source = ... |
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* final Path target = ... |
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* |
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* Files.walkFileTree(source, EnumSet.of(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE, |
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* new SimpleFileVisitor<Path>() { |
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* @Override |
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* public FileVisitResult preVisitDirectory(Path dir) { |
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* try { |
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* dir.copyTo(target.resolve(source.relativize(dir))); |
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* } catch (FileAlreadyExistsException e) { |
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* // ignore |
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* } catch (IOException e) { |
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* // copy failed, skip rest of directory and descendants |
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* return SKIP_SUBTREE; |
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* } |
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* return CONTINUE; |
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* } |
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* @Override |
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* public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) { |
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* try { |
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* file.copyTo(target.resolve(source.relativize(file))); |
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* } catch (IOException e) { |
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* // copy failed |
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* } |
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* return CONTINUE; |
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* } |
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* }); |
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* </pre> |
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* |
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* @since 1.7 |
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*/ |
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|
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public interface FileVisitor<T extends FileRef> { |
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|
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/** |
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* Invoked for a directory before entries in the directory are visited. |
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* |
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* <p> If this method returns {@link FileVisitResult#CONTINUE CONTINUE}, |
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* then entries in the directory are visited. If this method returns {@link |
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* FileVisitResult#SKIP_SUBTREE SKIP_SUBTREE} or {@link |
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* FileVisitResult#SKIP_SIBLINGS SKIP_SIBLINGS} then entries in the |
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* directory (and any descendants) will not be visited. |
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* |
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* @param dir |
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* A reference to the directory |
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* |
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* @return the visit result |
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*/ |
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FileVisitResult preVisitDirectory(T dir); |
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|
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/** |
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* Invoked for a directory that could not be opened. |
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* |
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* @param dir |
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* A reference to the directory |
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* @param exc |
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* The I/O exception thrown from the attempt to open the directory |
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* |
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* @return the visit result |
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*/ |
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FileVisitResult preVisitDirectoryFailed(T dir, IOException exc); |
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|
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/** |
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* Invoked for a file in a directory. |
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* |
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* @param file |
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* A reference to the file |
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* @param attrs |
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* The file's basic attributes |
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* |
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* @return the visit result |
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*/ |
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FileVisitResult visitFile(T file, BasicFileAttributes attrs); |
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|
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/** |
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* Invoked for a file when its basic file attributes could not be read. |
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* |
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* @param file |
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* A reference to the file |
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* @param exc |
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* The I/O exception thrown from the attempt to read the file |
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* attributes |
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* |
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* @return the visit result |
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*/ |
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FileVisitResult visitFileFailed(T file, IOException exc); |
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|
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/** |
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* Invoked for a directory after entries in the directory, and all of their |
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* descendants, have been visited. This method is also invoked when iteration |
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* of the directory completes prematurely (by a {@link #visitFile visitFile} |
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* method returning {@link FileVisitResult#SKIP_SIBLINGS SKIP_SIBLINGS}, |
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* or an I/O error when iterating over the directory). |
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* |
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* @param dir |
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* A reference to the directory |
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* @param exc |
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* {@code null} if the iteration of the directory completes without |
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* an error; otherwise the I/O exception that caused the iteration |
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* of the directory to complete prematurely |
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* |
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* @return the visit result |
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*/ |
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FileVisitResult postVisitDirectory(T dir, IOException exc); |
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} |