Directories.java

/*
 * Copyright (c) 2014 Dennis Fischer.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0+
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 *
 * Contributors: Dennis Fischer
 */

package de.chaosfisch.uploader;

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.EnumSet;

public final class Directories {
	private Directories() {
	}

	/**
	 * Copies a directory.
	 * <p/>
	 * NOTE: This method is not thread-safe.
	 * <p/>
	 *
	 * @param source the directory to copy from
	 * @param target the directory to copy into
	 * @throws IOException if an I/O error occurs
	 */
	public static void copyDirectory(final Path source, final Path target) throws IOException {
		Files.walkFileTree(source, EnumSet.of(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE, new FileVisitor<Path>() {
			@Override
			public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
				return FileVisitResult.CONTINUE;
			}

			@Override
			public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
				Files.copy(file, target.resolve(source.relativize(file)), StandardCopyOption.REPLACE_EXISTING);
				return FileVisitResult.CONTINUE;
			}

			@Override
			public FileVisitResult visitFileFailed(final Path file, final IOException exc) throws IOException {
				throw exc;
			}

			@Override
			public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
				if (null != exc) {
					throw exc;
				}
				return FileVisitResult.CONTINUE;
			}
		});
	}

	public static void delete(final Path directory) throws IOException {
		Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {

			@Override
			public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
				Files.delete(file);
				return FileVisitResult.CONTINUE;
			}

			@Override
			public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
				if (null == exc) {
					Files.delete(dir);
					return FileVisitResult.CONTINUE;
				} else {
					throw exc;
				}
			}
		});
	}
}