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 in seed from a 23 * benchmark parameter. 24 * 25 * <p>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) ? new SpecialRandom() : new SpecialRandom(Long.parseLong(s)); 32 } 33 34 private final boolean hasSeed; 35 private final long seed; 36 SpecialRandom()37 public SpecialRandom() { 38 this.hasSeed = false; 39 this.seed = 0; 40 } 41 SpecialRandom(long seed)42 public SpecialRandom(long seed) { 43 super(seed); 44 this.hasSeed = true; 45 this.seed = seed; 46 } 47 48 @Override toString()49 public String toString() { 50 return hasSeed ? "(seed:" + seed : "(default seed)"; 51 } 52 53 private static final long serialVersionUID = 0; 54 } 55