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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.rng.simple.internal;
18  
19  import java.util.Arrays;
20  
21  import org.apache.commons.rng.core.util.NumberFactory;
22  
23  /**
24   * Creates a {@code long[]} from a {@code byte[]}.
25   *
26   * @since 1.0
27   */
28  public class ByteArray2LongArray implements SeedConverter<byte[], long[]> {
29      /** Number of bytes in a {@code long}. */
30      private static final int LONG_SIZE = 8;
31  
32      /** {@inheritDoc} */
33      @Override
34      public long[] convert(byte[] seed) {
35          final byte[] tmp = seed.length % LONG_SIZE == 0 ?
36              seed :
37              Arrays.copyOf(seed, LONG_SIZE * ((seed.length + LONG_SIZE - 1) / LONG_SIZE));
38  
39          return NumberFactory.makeLongArray(tmp);
40      }
41  }