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 { valueOf(String s)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 SpecialRandom()39 public SpecialRandom() { 40 this.hasSeed = false; 41 this.seed = 0; 42 } 43 SpecialRandom(long seed)44 public SpecialRandom(long seed) { 45 super(seed); 46 this.hasSeed = true; 47 this.seed = seed; 48 } 49 toString()50 @Override public String toString() { 51 return hasSeed ? "(seed:" + seed : "(default seed)"; 52 } 53 54 private static final long serialVersionUID = 0; 55 } 56