| /* |
| * Copyright (C) 2008-2010, Google Inc. |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.eclipse.jgit.junit; |
| |
| /** Toy RNG to ensure we get predictable numbers during unit tests. */ |
| public class TestRng { |
| private int next; |
| |
| /** |
| * Create a new random number generator, seeded by a string. |
| * |
| * @param seed |
| * seed to bootstrap, usually this is the test method name. |
| */ |
| public TestRng(final String seed) { |
| next = 0; |
| for (int i = 0; i < seed.length(); i++) |
| next = next * 11 + seed.charAt(i); |
| } |
| |
| /** |
| * Get the next {@code cnt} bytes of random data. |
| * |
| * @param cnt |
| * number of random bytes to produce. |
| * @return array of {@code cnt} randomly generated bytes. |
| */ |
| public byte[] nextBytes(final int cnt) { |
| final byte[] r = new byte[cnt]; |
| for (int i = 0; i < cnt; i++) |
| r[i] = (byte) nextInt(); |
| return r; |
| } |
| |
| /** |
| * @return the next random integer. |
| */ |
| public int nextInt() { |
| next = next * 1103515245 + 12345; |
| return next; |
| } |
| } |