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 }