/*
* Copyright 2002-2017 the original author or authors.
*
* 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.
*/
package org.springframework.util;
import java.io.
File;
import java.io.
IOException;
/**
* Utility methods for working with the file system.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @since 2.5.3
*/
public abstract class
FileSystemUtils {
/**
* Delete the supplied {@link File} - for directories,
* recursively delete any nested directories or files as well.
* @param root the root {@code File} to delete
* @return {@code true} if the {@code File} was deleted,
* otherwise {@code false}
*/
public static boolean
deleteRecursively(
File root) {
if (
root != null &&
root.
exists()) {
if (
root.
isDirectory()) {
File[]
children =
root.
listFiles();
if (
children != null) {
for (
File child :
children) {
deleteRecursively(
child);
}
}
}
return
root.
delete();
}
return false;
}
/**
* Recursively copy the contents of the {@code src} file/directory
* to the {@code dest} file/directory.
* @param src the source directory
* @param dest the destination directory
* @throws IOException in the case of I/O errors
*/
public static void
copyRecursively(
File src,
File dest) throws
IOException {
Assert.
isTrue(
src != null && (
src.
isDirectory() ||
src.
isFile()),
"Source File must denote a directory or file");
Assert.
notNull(
dest, "Destination File must not be null");
doCopyRecursively(
src,
dest);
}
/**
* Actually copy the contents of the {@code src} file/directory
* to the {@code dest} file/directory.
* @param src the source directory
* @param dest the destination directory
* @throws IOException in the case of I/O errors
*/
private static void
doCopyRecursively(
File src,
File dest) throws
IOException {
if (
src.
isDirectory()) {
dest.
mkdir();
File[]
entries =
src.
listFiles();
if (
entries == null) {
throw new
IOException("Could not list files in directory: " +
src);
}
for (
File entry :
entries) {
doCopyRecursively(
entry, new
File(
dest,
entry.
getName()));
}
}
else if (
src.
isFile()) {
try {
dest.
createNewFile();
}
catch (
IOException ex) {
throw new
IOException("Failed to create file: " +
dest,
ex);
}
FileCopyUtils.
copy(
src,
dest);
}
else {
// Special File handle: neither a file not a directory.
// Simply skip it when contained in nested directory...
}
}
}