1 /*
   2  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.nio.file.*;
  25 import java.nio.file.attribute.*;
  26 import java.io.IOException;
  27 import java.util.*;
  28 
  29 /**
  30  * Unit test for Files.walkFileTree to test TERMINATE return value
  31  */
  32 
  33 public class TerminateWalk {
  34 
  35     static final Random rand = new Random();
  36     static boolean terminated;
  37 
  38     static FileVisitResult maybeTerminate() {
  39         if (terminated)
  40             throw new RuntimeException("FileVisitor invoked after termination");
  41         if (rand.nextInt(10) == 0) {
  42             terminated = true;
  43             return FileVisitResult.TERMINATE;
  44         } else {
  45             return FileVisitResult.CONTINUE;
  46         }
  47     }
  48 
  49     public static void main(String[] args) throws Exception {
  50         Path dir = Paths.get(args[0]);
  51 
  52         Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
  53             @Override
  54             public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
  55                 return maybeTerminate();
  56             }
  57             @Override
  58             public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
  59                 return maybeTerminate();
  60             }
  61             @Override
  62             public FileVisitResult postVisitDirectory(Path dir, IOException x) {
  63                 return maybeTerminate();
  64             }
  65         });
  66     }
  67 }