| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.rng.core.source64; |
| |
| /** |
| * A fast all-purpose generator. |
| * |
| * <p>This is a member of the Xor-Shift-Rotate family of generators. Memory footprint is 512 bits |
| * and the period is 2<sup>512</sup>-1. Speed is expected to be slower than |
| * {@link XoShiRo256StarStar}.</p> |
| * |
| * @see <a href="http://xoshiro.di.unimi.it/xoshiro512plusplus.c">Original source code</a> |
| * @see <a href="http://xoshiro.di.unimi.it/">xorshiro / xoroshiro generators</a> |
| * @since 1.3 |
| */ |
| public class XoShiRo512PlusPlus extends AbstractXoShiRo512 { |
| /** |
| * Creates a new instance. |
| * |
| * @param seed Initial seed. |
| * If the length is larger than 8, only the first 8 elements will |
| * be used; if smaller, the remaining elements will be automatically |
| * set. A seed containing all zeros will create a non-functional generator. |
| */ |
| public XoShiRo512PlusPlus(long[] seed) { |
| super(seed); |
| } |
| |
| /** |
| * Creates a new instance using an 8 element seed. |
| * A seed containing all zeros will create a non-functional generator. |
| * |
| * @param seed0 Initial seed element 0. |
| * @param seed1 Initial seed element 1. |
| * @param seed2 Initial seed element 2. |
| * @param seed3 Initial seed element 3. |
| * @param seed4 Initial seed element 4. |
| * @param seed5 Initial seed element 5. |
| * @param seed6 Initial seed element 6. |
| * @param seed7 Initial seed element 7. |
| */ |
| public XoShiRo512PlusPlus(long seed0, long seed1, long seed2, long seed3, |
| long seed4, long seed5, long seed6, long seed7) { |
| super(seed0, seed1, seed2, seed3, seed4, seed5, seed6, seed7); |
| } |
| |
| /** |
| * Creates a copy instance. |
| * |
| * @param source Source to copy. |
| */ |
| protected XoShiRo512PlusPlus(XoShiRo512PlusPlus source) { |
| super(source); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected long nextOutput() { |
| return Long.rotateLeft(state0 + state2, 17) + state2; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected XoShiRo512PlusPlus copy() { |
| // This exists to ensure the jump function performed in the super class returns |
| // the correct class type. It should not be public. |
| return new XoShiRo512PlusPlus(this); |
| } |
| } |