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 }