| /* |
| * 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.collect.ImmutableSortedSet; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.Paths; |
| |
| public class DirectoryTraversers { |
| |
| private DirectoryTraversers() {} |
| |
| private static final DirectoryTraversers instance = new DirectoryTraversers(); |
| |
| public static DirectoryTraversers getInstance() { |
| return instance; |
| } |
| |
| /** |
| * Aggregates a set of all paths to files in the specified directories. All file paths will be |
| * relative to the project root. |
| * @param pathToDirectory path to directory to traverse. The directory may not contain symlinks to |
| * other directories. |
| * @param traverser |
| * @return a set of all files in paths, sorted alphabetically |
| */ |
| public ImmutableSortedSet<String> findFiles(final String pathToDirectory, |
| DirectoryTraverser traverser) throws IOException { |
| final ImmutableSortedSet.Builder<String> allFiles = ImmutableSortedSet.naturalOrder(); |
| |
| traverser.traverse(new DirectoryTraversal(new File(pathToDirectory)) { |
| @Override |
| public void visit(File file, String relativePath) { |
| allFiles.add(Paths.get(pathToDirectory, relativePath).toString()); |
| } |
| }); |
| |
| return allFiles.build(); |
| } |
| } |