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