001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.rng.simple.internal;
018
019import org.apache.commons.rng.core.source64.SplitMix64;
020
021/**
022 * Uses a {@code Long} value to seed a {@link SplitMix64} RNG and
023 * create a {@code long[]} with the requested number of random
024 * values.
025 *
026 * @since 1.0
027 */
028public class Long2LongArray implements SeedConverter<Long, long[]> {
029    /** Size of the output array. */
030    private final int size;
031
032    /**
033     * @param size Size of the output array.
034     */
035    public Long2LongArray(int size) {
036        this.size = size;
037    }
038
039    /** {@inheritDoc} */
040    @Override
041    public long[] convert(Long seed) {
042        final long[] out = new long[size];
043        final SplitMix64 rng = new SplitMix64(seed);
044        for (int i = 0; i < size; i++) {
045            out[i] = rng.nextLong();
046        }
047
048        return out;
049    }
050}