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- /*
- * 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;
- }
- }
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