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113 lines
2.6 KiB
113 lines
2.6 KiB
/*
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.nio.file;
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import java.nio.file.attribute.BasicFileAttributes;
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import java.io.IOException;
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import java.util.Objects;
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/**
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* A simple visitor of files with default behavior to visit all files and to
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* re-throw I/O errors.
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*
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* <p> Methods in this class may be overridden subject to their general contract.
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*
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* @param <T> The type of reference to the files
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*
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* @since 1.7
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*/
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public class SimpleFileVisitor<T> implements FileVisitor<T> {
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/**
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* Initializes a new instance of this class.
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*/
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protected SimpleFileVisitor() {
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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> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
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* CONTINUE}.
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*/
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@Override
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public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs)
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throws IOException
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{
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Objects.requireNonNull(dir);
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Objects.requireNonNull(attrs);
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return FileVisitResult.CONTINUE;
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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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* <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
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* CONTINUE}.
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*/
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@Override
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public FileVisitResult visitFile(T file, BasicFileAttributes attrs)
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throws IOException
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{
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Objects.requireNonNull(file);
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Objects.requireNonNull(attrs);
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return FileVisitResult.CONTINUE;
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}
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/**
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* Invoked for a file that could not be visited.
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*
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* <p> Unless overridden, this method re-throws the I/O exception that prevented
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* the file from being visited.
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*/
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@Override
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public FileVisitResult visitFileFailed(T file, IOException exc)
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throws IOException
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{
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Objects.requireNonNull(file);
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throw 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.
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*
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* <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
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* CONTINUE} if the directory iteration completes without an I/O exception;
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* otherwise this method re-throws the I/O exception that caused the iteration
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* of the directory to terminate prematurely.
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*/
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@Override
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public FileVisitResult postVisitDirectory(T dir, IOException exc)
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throws IOException
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{
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Objects.requireNonNull(dir);
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if (exc != null)
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throw exc;
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return FileVisitResult.CONTINUE;
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}
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}
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