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 java.util.Arrays;
020
021import org.apache.commons.rng.core.util.NumberFactory;
022
023/**
024 * Creates a {@code long[]} from a {@code byte[]}.
025 *
026 * @since 1.0
027 */
028public class ByteArray2LongArray implements SeedConverter<byte[], long[]> {
029    /** Number of bytes in a {@code long}. */
030    private static final int LONG_SIZE = 8;
031
032    /** {@inheritDoc} */
033    @Override
034    public long[] convert(byte[] seed) {
035        final byte[] tmp = seed.length % LONG_SIZE == 0 ?
036            seed :
037            Arrays.copyOf(seed, LONG_SIZE * ((seed.length + LONG_SIZE - 1) / LONG_SIZE));
038
039        return NumberFactory.makeLongArray(tmp);
040    }
041}