author | ohair |
Wed, 06 Apr 2011 22:06:11 -0700 | |
changeset 9035 | 1255eb81cc2f |
parent 8158 | 77d9c0f1c19f |
child 17170 | 9f33b89c7978 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2011, 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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import java.nio.file.*; |
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import java.io.IOException; |
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import java.util.*; |
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/** |
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* Creates a file tree with possible cycles caused by symbolic links |
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* to ancestor directories. |
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*/ |
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public class CreateFileTree { |
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static final Random rand = new Random(); |
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public static void main(String[] args) throws IOException { |
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Path top = Files.createTempDirectory("tree"); |
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List<Path> dirs = new ArrayList<Path>(); |
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// create tree |
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Queue<Path> queue = new ArrayDeque<Path>(); |
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queue.add(top); |
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int total = 1 + rand.nextInt(20); |
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int n = 0; |
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Path dir; |
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while (((dir = queue.poll()) != null) && (n < total)) { |
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int r = Math.min((total-n), (1+rand.nextInt(3))); |
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for (int i=0; i<r; i++) { |
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String name = "dir" + (++n); |
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Path subdir = Files.createDirectory(dir.resolve(name)); |
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queue.offer(subdir); |
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dirs.add(subdir); |
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} |
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} |
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assert dirs.size() >= 2; |
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// create a few regular files in the file tree |
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int files = dirs.size() * 3; |
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for (int i=0; i<files; i++) { |
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String name = "file" + (i+1); |
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int x = rand.nextInt(dirs.size()); |
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Files.createFile(dirs.get(x).resolve(name)); |
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} |
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// create a few sym links in the file tree so as to create cycles |
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int links = 1 + rand.nextInt(5); |
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for (int i=0; i<links; i++) { |
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int x = rand.nextInt(dirs.size()); |
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int y; |
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do { |
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y = rand.nextInt(dirs.size()); |
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} while (y != x); |
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String name = "link" + (i+1); |
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Path link = dirs.get(x).resolve(name); |
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Path target = dirs.get(y); |
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Files.createSymbolicLink(link, target); |
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} |
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// done |
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System.out.println(top); |
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} |
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} |