    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.io.file;
    019
    020import java.io.IOException;
    021import java.nio.file.CopyOption;
    022import java.nio.file.FileVisitResult;
    023import java.nio.file.Files;
    024import java.nio.file.Path;
    025import java.nio.file.attribute.BasicFileAttributes;
    026
    027import org.apache.commons.io.file.Counters.PathCounters;
    028
    029/**
    030 * Copies a source directory to a target directory.
    031 *
    032 * @since 2.7
    033 */
    034public class CopyDirectoryVisitor extends CountingPathVisitor {
    035
    036    private static final CopyOption[] EMPTY_COPY_OPTIONS = new CopyOption[0];
    037
    038    private final CopyOption[] copyOptions;
    039    private final Path sourceDirectory;
    040    private final Path targetDirectory;
    041
    042    /**
    043     * Constructs a new visitor that deletes files except for the files and directories explicitly given.
    044     *
    045     * @param pathCounter How to count visits.
    046     * @param sourceDirectory The source directory
    047     * @param targetDirectory The target directory
    048     * @param copyOptions Specifies how the copying should be done.
    049     */
    050    public CopyDirectoryVisitor(final PathCounters pathCounter, final Path sourceDirectory, final Path targetDirectory,
    051            final CopyOption... copyOptions) {
    052        super(pathCounter);
    053        this.sourceDirectory = sourceDirectory;
    054        this.targetDirectory = targetDirectory;
    055        this.copyOptions = copyOptions == null ? EMPTY_COPY_OPTIONS : copyOptions.clone();
    056    }
    057
    058    @Override
    059    public FileVisitResult preVisitDirectory(final Path directory, final BasicFileAttributes attributes)
    060            throws IOException {
    061        final Path newTargetDir = targetDirectory.resolve(sourceDirectory.relativize(directory));
    062        if (Files.notExists(newTargetDir)) {
    063            Files.createDirectory(newTargetDir);
    064        }
    065        return super.preVisitDirectory(directory, attributes);
    066    }
    067
    068    @Override
    069    public FileVisitResult visitFile(final Path sourceFile, final BasicFileAttributes attributes) throws IOException {
    070        final Path targetFile = targetDirectory.resolve(sourceDirectory.relativize(sourceFile));
    071        Files.copy(sourceFile, targetFile, copyOptions);
    072        return super.visitFile(targetFile, attributes);
    073    }
    074
    075}