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/*
* Copyright (C) 2008-2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
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(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(int cnt) {
final byte[] r = new byte[cnt];
for (int i = 0; i < cnt; i++)
r[i] = (byte) nextInt();
return r;
}
/**
* Next int
*
* @return the next random integer.
*/
public int nextInt() {
next = next * 1103515245 + 12345;
return next;
}
}
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