95 lines
3.1 KiB
Java
95 lines
3.1 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Unit test for Files.walkFileTree to test SKIP_SUBTREE return value
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* @library ../..
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* @compile SkipSubtree.java CreateFileTree.java
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* @run main SkipSubtree
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* @key randomness
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*/
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import java.nio.file.*;
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import java.nio.file.attribute.BasicFileAttributes;
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import java.io.IOException;
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import java.util.HashSet;
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import java.util.Random;
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import java.util.Set;
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public class SkipSubtree {
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static final Random rand = new Random();
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static final Set<Path> skipped = new HashSet<>();
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// check if this path should have been skipped
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static void check(Path path) {
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do {
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if (skipped.contains(path))
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throw new RuntimeException(path + " should not have been visited");
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path = path.getParent();
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} while (path != null);
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}
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// indicates if the subtree should be skipped
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static boolean skip(Path path) {
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if (rand.nextInt(3) == 0) {
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skipped.add(path);
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return true;
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}
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return false;
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}
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public static void main(String[] args) throws Exception {
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Path top = CreateFileTree.create();
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try {
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test(top);
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} finally {
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TestUtil.removeAll(top);
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}
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}
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static void test(final Path start) throws IOException {
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Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
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@Override
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public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
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check(dir);
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if (skip(dir))
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return FileVisitResult.SKIP_SUBTREE;
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return FileVisitResult.CONTINUE;
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}
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@Override
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public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
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check(file);
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return FileVisitResult.CONTINUE;
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}
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@Override
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public FileVisitResult postVisitDirectory(Path dir, IOException x) {
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if (x != null)
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throw new RuntimeException(x);
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check(dir);
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return FileVisitResult.CONTINUE;
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}
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});
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}
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}
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