| /* |
| * 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.Preconditions; |
| import com.google.common.collect.ImmutableSet; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.FileVisitOption; |
| import java.nio.file.FileVisitResult; |
| import java.nio.file.FileVisitor; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.util.EnumSet; |
| |
| /** |
| * Traverses all files in a directory. This class <em>will</em> follow symlinks. |
| */ |
| public abstract class DirectoryTraversal { |
| |
| private final File root; |
| private final ImmutableSet<String> ignorePaths; |
| |
| /** @param root must be a directory */ |
| public DirectoryTraversal(File root, ImmutableSet<String> ignorePaths) { |
| this.root = Preconditions.checkNotNull(root); |
| this.ignorePaths = Preconditions.checkNotNull(ignorePaths); |
| } |
| |
| public DirectoryTraversal(File root) { |
| this(root, ImmutableSet.<String>of()); |
| } |
| |
| public File getRoot() { |
| return root; |
| } |
| |
| public final void traverse() throws IOException { |
| Preconditions.checkState(root.isDirectory(), "Must be a directory: %s", root); |
| |
| final Path rootPath = root.toPath(); |
| FileVisitor<Path> visitor = new FileVisitor<Path>() { |
| @Override |
| public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException { |
| if (ignorePaths.contains(rootPath.relativize(dir).toString())) { |
| return FileVisitResult.SKIP_SUBTREE; |
| } else { |
| return FileVisitResult.CONTINUE; |
| } |
| } |
| |
| @Override |
| public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { |
| visit(file.toFile(), rootPath.relativize(file).toString()); |
| return FileVisitResult.CONTINUE; |
| } |
| |
| @Override |
| public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException { |
| return FileVisitResult.CONTINUE; |
| } |
| |
| @Override |
| public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException { |
| return FileVisitResult.CONTINUE; |
| } |
| }; |
| |
| Files.walkFileTree( |
| rootPath, EnumSet.of(FileVisitOption.FOLLOW_LINKS), /* maxDepth */ Integer.MAX_VALUE, |
| visitor); |
| } |
| |
| /** |
| * @param file an ordinary file (not a directory) |
| * @param relativePath a path such as "foo.txt" or "foo/bar.txt" |
| */ |
| public abstract void visit(File file, String relativePath) throws IOException; |
| |
| public static void main(String[] args) throws IOException { |
| File directory = new File(args[0]); |
| new DirectoryTraversal(directory) { |
| |
| @Override |
| public void visit(File file, String relativePath) { |
| System.out.println(relativePath); |
| } |
| }.traverse(); |
| } |
| } |