113 lines
3.6 KiB
Java
113 lines
3.6 KiB
Java
/*
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* Copyright (c) 2007, 2011, 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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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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