1 /*
   2  * Copyright (c) 2008, 2013, 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 /*
  25  * @test
  26  * @summary Unit test for Files.walkFileTree to test TERMINATE return value
  27  * @library ../..
  28  * @compile TerminateWalk.java CreateFileTree.java
  29  * @run main TerminateWalk
  30  * @key randomness
  31  */
  32 
  33 import java.nio.file.*;
  34 import java.nio.file.attribute.*;
  35 import java.io.IOException;
  36 import java.util.*;
  37 
  38 public class TerminateWalk {
  39 
  40     static final Random rand = new Random();
  41     static boolean terminated;
  42 
  43     static FileVisitResult maybeTerminate() {
  44         if (terminated)
  45             throw new RuntimeException("FileVisitor invoked after termination");
  46         if (rand.nextInt(10) == 0) {
  47             terminated = true;
  48             return FileVisitResult.TERMINATE;
  49         } else {
  50             return FileVisitResult.CONTINUE;
  51         }
  52     }
  53 
  54     public static void main(String[] args) throws Exception {
  55         Path top = CreateFileTree.create();
  56         try {
  57             test(top);
  58         } finally {
  59             TestUtil.removeAll(top);
  60         }
  61     }
  62 
  63     static void test(Path start) throws IOException {
  64         Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
  65             @Override
  66             public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
  67                 return maybeTerminate();
  68             }
  69             @Override
  70             public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
  71                 return maybeTerminate();
  72             }
  73             @Override
  74             public FileVisitResult postVisitDirectory(Path dir, IOException x) {
  75                 return maybeTerminate();
  76             }
  77         });
  78     }
  79 }