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/*
* Copyright 2004-2013 ICEsoft Technologies Canada Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS
* IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions andd
* limitations under the License.
*/
package org.icefaces.apache.commons.io;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.Checksum;
/**
* General file manipulation utilities.
*
* Facilities are provided in the following areas:
*
* - writing to a file
*
- reading from a file
*
- make a directory including parent directories
*
- copying files and directories
*
- deleting files and directories
*
- converting to and from a URL
*
- listing files and directories by filter and extension
*
- comparing file content
*
- file last changed date
*
- calculating a checksum
*
*
* Origin of code: Excalibur, Alexandria, Commons-Utils
*
* @author Kevin A. Burton
* @author Scott Sanders
* @author Daniel Rall
* @author Christoph.Reck
* @author Peter Donald
* @author Jeff Turner
* @author Matthew Hawthorne
* @author Jeremias Maerki
* @author Stephen Colebourne
* @author Ian Springer
* @author Chris Eldredge
* @author Jim Harrington
* @author Niall Pemberton
* @author Sandy McArthur
* @version $Id: FileUtils.java 507684 2007-02-14 20:38:25Z bayard $
*/
public class FileUtils {
/**
* Instances should NOT be constructed in standard programming.
*/
public FileUtils() {
super();
}
/**
* The number of bytes in a kilobyte.
*/
public static final long ONE_KB = 1024;
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The number of bytes in a gigabyte.
*/
public static final long ONE_GB = ONE_KB * ONE_MB;
/**
* An empty array of type File.
*/
public static final File[] EMPTY_FILE_ARRAY = new File[0];
//-----------------------------------------------------------------------
/**
* Recursively delete a directory.
*
* @param directory directory to delete
* @throws IOException in case deletion is unsuccessful
*/
public static void deleteDirectory(File directory) throws IOException {
if (!directory.exists()) {
return;
}
cleanDirectory(directory);
if (!directory.delete()) {
String message =
"Unable to delete directory " + directory + ".";
throw new IOException(message);
}
}
/**
* Clean a directory without deleting it.
*
* @param directory directory to clean
* @throws IOException in case cleaning is unsuccessful
*/
public static void cleanDirectory(File directory) throws IOException {
if (!directory.exists()) {
String message = directory + " does not exist";
throw new IllegalArgumentException(message);
}
if (!directory.isDirectory()) {
String message = directory + " is not a directory";
throw new IllegalArgumentException(message);
}
File[] files = directory.listFiles();
if (files == null) { // null if security restricted
throw new IOException("Failed to list contents of " + directory);
}
IOException exception = null;
for (int i = 0; i < files.length; i++) {
File file = files[i];
try {
forceDelete(file);
} catch (IOException ioe) {
exception = ioe;
}
}
if (null != exception) {
throw exception;
}
}
//-----------------------------------------------------------------------
/**
* Delete a file. If file is a directory, delete it and all sub-directories.
*
* The difference between File.delete() and this method are:
*
* - A directory to be deleted does not have to be empty.
* - You get exceptions when a file or directory cannot be deleted.
* (java.io.File methods returns a boolean)
*
*
* @param file file or directory to delete, must not be null
* @throws NullPointerException if the directory is null
* @throws IOException in case deletion is unsuccessful
*/
public static void forceDelete(File file) throws IOException {
if (file.isDirectory()) {
deleteDirectory(file);
} else {
if (!file.exists()) {
throw new FileNotFoundException("File does not exist: " + file);
}
if (!file.delete()) {
String message =
"Unable to delete file: " + file;
throw new IOException(message);
}
}
}
}