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SimpleFileVisitor.java
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112 lines (104 loc) · 2.65 KB
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/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.nio.file;
import java.nio.file.attribute.BasicFileAttributes;
import java.io.IOException;
import java.util.Objects;
/**
* A simple visitor of files with default behavior to visit all files and to
* re-throw I/O errors.
*
* <p> Methods in this class may be overridden subject to their general contract.
*
* @param <T> The type of reference to the files
*
* @since 1.7
*/
public class SimpleFileVisitor<T> implements FileVisitor<T> {
/**
* Initializes a new instance of this class.
*/
protected SimpleFileVisitor() {
}
/**
* Invoked for a directory before entries in the directory are visited.
*
* <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
* CONTINUE}.
*/
@Override
public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs)
throws IOException
{
Objects.requireNonNull(dir);
Objects.requireNonNull(attrs);
return FileVisitResult.CONTINUE;
}
/**
* Invoked for a file in a directory.
*
* <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
* CONTINUE}.
*/
@Override
public FileVisitResult visitFile(T file, BasicFileAttributes attrs)
throws IOException
{
Objects.requireNonNull(file);
Objects.requireNonNull(attrs);
return FileVisitResult.CONTINUE;
}
/**
* Invoked for a file that could not be visited.
*
* <p> Unless overridden, this method re-throws the I/O exception that prevented
* the file from being visited.
*/
@Override
public FileVisitResult visitFileFailed(T file, IOException exc)
throws IOException
{
Objects.requireNonNull(file);
throw exc;
}
/**
* Invoked for a directory after entries in the directory, and all of their
* descendants, have been visited.
*
* <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
* CONTINUE} if the directory iteration completes without an I/O exception;
* otherwise this method re-throws the I/O exception that caused the iteration
* of the directory to terminate prematurely.
*/
@Override
public FileVisitResult postVisitDirectory(T dir, IOException exc)
throws IOException
{
Objects.requireNonNull(dir);
if (exc != null)
throw exc;
return FileVisitResult.CONTINUE;
}
}