1/*
2 * Copyright (C) 2010 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import java.util.Random;
20
21/**
22 * Utility class for being able to seed a {@link Random} value with a passed
23 * in seed from a benchmark parameter.
24 *
25 * TODO: Remove this class once Caliper has a better way.
26 *
27 * @author Nicholaus Shupe
28 */
29public final class SpecialRandom extends Random {
30  public static SpecialRandom valueOf(String s) {
31    return (s.length() == 0)
32        ? new SpecialRandom()
33        : new SpecialRandom(Long.parseLong(s));
34  }
35
36  private final boolean hasSeed;
37  private final long seed;
38
39  public SpecialRandom() {
40    this.hasSeed = false;
41    this.seed = 0;
42  }
43
44  public SpecialRandom(long seed) {
45    super(seed);
46    this.hasSeed = true;
47    this.seed = seed;
48  }
49
50  @Override public String toString() {
51    return hasSeed ? "(seed:" + seed : "(default seed)";
52  }
53
54  private static final long serialVersionUID = 0;
55}
56