org.springframework.util.FileSystemUtils Maven / Gradle / Ivy
/*
* 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
*
* https://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...
}
}
}