| /* |
| * Copyright 2012-present Facebook, Inc. |
| * |
| * 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 com.facebook.buck.util; |
| |
| import com.google.common.base.Predicate; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.Map; |
| |
| /** |
| * This class allows the creation of copies of multiple directories, while filtering out files which |
| * do not match a specified predicate. |
| * <p> |
| * Current caveats: <ul> |
| * <li>Existing content in destination directories is deleted.</li> |
| * <li>Empty directories will not be created.</li> |
| * </ul> |
| */ |
| public class DefaultFilteredDirectoryCopier implements FilteredDirectoryCopier { |
| |
| private static final DefaultFilteredDirectoryCopier instance |
| = new DefaultFilteredDirectoryCopier(); |
| |
| public static DefaultFilteredDirectoryCopier getInstance() { |
| return instance; |
| } |
| |
| private DefaultFilteredDirectoryCopier() { |
| |
| } |
| |
| @Override |
| public void copyDirs(Map<String, String> sourcesToDestinations, |
| Predicate<File> pred) throws IOException { |
| for (Map.Entry<String, String> e : sourcesToDestinations.entrySet()) { |
| copyDir(e.getKey(), e.getValue(), pred); |
| } |
| } |
| |
| @Override |
| public void copyDir( |
| String srcDir, |
| String destDir, |
| final Predicate<File> pred) throws IOException { |
| final Path dest = MorePaths.absolutify(MorePaths.newPathInstance(destDir)); |
| |
| // Remove existing contents if any. |
| if (dest.toFile().exists()) { |
| MoreFiles.rmdir(dest); |
| } |
| Files.createDirectories(dest); |
| |
| // Copy filtered contents. |
| new DirectoryTraversal(new File(srcDir)) { |
| @Override |
| public void visit(File srcFile, String relativePath) throws IOException { |
| if (pred.apply(srcFile)) { |
| Path destPath = dest.resolve(relativePath); |
| Files.createDirectories(destPath.getParent()); |
| Files.copy(srcFile.toPath(), destPath); |
| } |
| } |
| }.traverse(); |
| } |
| } |