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/*
 * Copyright 2002-2020 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;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.EnumSet;

import org.springframework.lang.Nullable;

import static java.nio.file.FileVisitOption.FOLLOW_LINKS;

/**
 * Utility methods for working with the file system.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.5.3
 * @see java.io.File
 * @see java.nio.file.Path
 * @see java.nio.file.Files
 */
public abstract class FileSystemUtils {

	/**
	 * Delete the supplied {@link File} - for directories,
	 * recursively delete any nested directories or files as well.
	 * 

Note: Like {@link File#delete()}, this method does not throw any * exception but rather silently returns {@code false} in case of I/O * errors. Consider using {@link #deleteRecursively(Path)} for NIO-style * handling of I/O errors, clearly differentiating between non-existence * and failure to delete an existing file. * @param root the root {@code File} to delete * @return {@code true} if the {@code File} was successfully deleted, * otherwise {@code false} */ public static boolean deleteRecursively(@Nullable File root) { if (root == null) { return false; } try { return deleteRecursively(root.toPath()); } catch (IOException ex) { return false; } } /** * 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} existed and was deleted, * or {@code false} if it did not exist * @throws IOException in the case of I/O errors * @since 5.0 */ public static boolean deleteRecursively(@Nullable Path root) throws IOException { if (root == null) { return false; } if (!Files.exists(root)) { return false; } Files.walkFileTree(root, new SimpleFileVisitor() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { Files.delete(file); return FileVisitResult.CONTINUE; } @Override public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException { Files.delete(dir); return FileVisitResult.CONTINUE; } }); return true; } /** * 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.notNull(src, "Source File must not be null"); Assert.notNull(dest, "Destination File must not be null"); copyRecursively(src.toPath(), dest.toPath()); } /** * 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 * @since 5.0 */ public static void copyRecursively(Path src, Path dest) throws IOException { Assert.notNull(src, "Source Path must not be null"); Assert.notNull(dest, "Destination Path must not be null"); BasicFileAttributes srcAttr = Files.readAttributes(src, BasicFileAttributes.class); if (srcAttr.isDirectory()) { Files.walkFileTree(src, EnumSet.of(FOLLOW_LINKS), Integer.MAX_VALUE, new SimpleFileVisitor() { @Override public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException { Files.createDirectories(dest.resolve(src.relativize(dir))); return FileVisitResult.CONTINUE; } @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { Files.copy(file, dest.resolve(src.relativize(file)), StandardCopyOption.REPLACE_EXISTING); return FileVisitResult.CONTINUE; } }); } else if (srcAttr.isRegularFile()) { Files.copy(src, dest); } else { throw new IllegalArgumentException("Source File must denote a directory or file"); } } }





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