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 
17 package com.google.common.collect;
18 
19 import 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  */
29 public 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