| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.nio.file.*; |
| import java.nio.file.attribute.*; |
| import java.io.IOException; |
| import java.util.*; |
| |
| /** |
| * Invokes Files.walkFileTree to traverse a file tree and prints |
| * each of the directories and files. The -follow option causes symbolic |
| * links to be followed and the -printCycles option will print links |
| * where the target of the link is an ancestor directory. |
| */ |
| |
| public class PrintFileTree { |
| |
| public static void main(String[] args) throws Exception { |
| boolean followLinks = false; |
| boolean printCycles = false; |
| int i = 0; |
| while (i < (args.length-1)) { |
| switch (args[i]) { |
| case "-follow" : followLinks = true; break; |
| case "-printCycles" : printCycles = true; break; |
| default: |
| throw new RuntimeException(args[i] + " not recognized"); |
| } |
| i++; |
| } |
| Path dir = Paths.get(args[i]); |
| |
| Set<FileVisitOption> options = new HashSet<FileVisitOption>(); |
| if (followLinks) |
| options.add(FileVisitOption.FOLLOW_LINKS); |
| |
| final boolean reportCycles = printCycles; |
| Files.walkFileTree(dir, options, Integer.MAX_VALUE, new FileVisitor<FileRef>() { |
| public FileVisitResult preVisitDirectory(FileRef dir) { |
| System.out.println(dir); |
| return FileVisitResult.CONTINUE; |
| } |
| public FileVisitResult preVisitDirectoryFailed(FileRef dir, IOException exc) { |
| exc.printStackTrace(); |
| return FileVisitResult.CONTINUE; |
| } |
| public FileVisitResult visitFile(FileRef file, BasicFileAttributes attrs) { |
| if (!attrs.isDirectory() || reportCycles) |
| System.out.println(file); |
| return FileVisitResult.CONTINUE; |
| } |
| public FileVisitResult postVisitDirectory(FileRef dir, IOException exc) { |
| if (exc != null) { |
| exc.printStackTrace(); |
| return FileVisitResult.TERMINATE; |
| } |
| return FileVisitResult.CONTINUE; |
| } |
| public FileVisitResult visitFileFailed(FileRef file, IOException exc) { |
| exc.printStackTrace(); |
| return FileVisitResult.TERMINATE; |
| } |
| }); |
| } |
| } |