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 SKIP_SIBLINGS return value 27 * @library ../.. 28 * @compile SkipSiblings.java CreateFileTree.java 29 * @run main SkipSiblings 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 SkipSiblings { 39 40 static final Random rand = new Random(); 41 static final Set<Path> skipped = new HashSet<Path>(); 42 43 // check if this path's directory has been skipped 44 static void check(Path path) { 45 if (skipped.contains(path.getParent())) 46 throw new RuntimeException(path + " should not have been visited"); 47 } 48 49 // indicates if the siblings of this path should be skipped 50 static boolean skip(Path path) { 51 Path parent = path.getParent(); 52 if (parent != null && rand.nextBoolean()) { 53 skipped.add(parent); 54 return true; 55 } 56 return false; 57 } 58 59 public static void main(String[] args) throws Exception { 60 Path top = CreateFileTree.create(); 61 try { 62 test(top); 63 } finally { 64 TestUtil.removeAll(top); 65 } 66 } 67 68 static void test(final Path start) throws IOException { 69 Files.walkFileTree(start, new SimpleFileVisitor<Path>() { 70 @Override 71 public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) { 72 check(dir); 73 if (skip(dir)) 74 return FileVisitResult.SKIP_SIBLINGS; 75 return FileVisitResult.CONTINUE; 76 } 77 @Override 78 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) { 79 check(file); 80 if (skip(file)) 81 return FileVisitResult.SKIP_SIBLINGS; 82 return FileVisitResult.CONTINUE; 83 } 84 @Override 85 public FileVisitResult postVisitDirectory(Path dir, IOException x) { 86 if (x != null) 87 throw new RuntimeException(x); 88 check(dir); 89 if (rand.nextBoolean()) { 90 return FileVisitResult.CONTINUE; 91 } else { 92 return FileVisitResult.SKIP_SIBLINGS; 93 } 94 } 95 }); 96 } 97 }