1 /* 2 * Copyright (C) 2009 Google Inc. 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 examples; 18 19 import com.google.caliper.Benchmark; 20 import com.google.caliper.Param; 21 22 /** 23 * Measures the various ways the JDK converts doubles to strings. 24 */ 25 public class DoubleToStringBenchmark2 { 26 @Param boolean useWrapper; 27 28 enum Value { 29 Pi(Math.PI), 30 NegativeZero(-0.0), 31 NegativeInfinity(Double.NEGATIVE_INFINITY), 32 NaN(Double.NaN); 33 34 final double d; 35 Value(double d)36 Value(double d) { 37 this.d = d; 38 } 39 } 40 41 @Param Value value; 42 toString(int reps)43 @Benchmark int toString(int reps) { 44 int dummy = 0; 45 if (useWrapper) { 46 Double d = value.d; 47 for (int i = 0; i < reps; i++) { 48 dummy += d.toString().length(); 49 } 50 } else { 51 double d = value.d; 52 for (int i = 0; i < reps; i++) { 53 dummy += ((Double) d).toString().length(); 54 } 55 } 56 return dummy; 57 } 58 stringValueOf(int reps)59 @Benchmark int stringValueOf(int reps) { 60 int dummy = 0; 61 if (useWrapper) { 62 Double d = value.d; 63 for (int i = 0; i < reps; i++) { 64 dummy += String.valueOf(d).length(); 65 } 66 } else { 67 double d = value.d; 68 for (int i = 0; i < reps; i++) { 69 dummy += String.valueOf(d).length(); 70 } 71 } 72 return dummy; 73 } 74 stringFormat(int reps)75 @Benchmark int stringFormat(int reps) { 76 int dummy = 0; 77 if (useWrapper) { 78 Double d = value.d; 79 for (int i = 0; i < reps; i++) { 80 dummy += String.format("%f", d).length(); 81 } 82 } else { 83 double d = value.d; 84 for (int i = 0; i < reps; i++) { 85 dummy += String.format("%f", d).length(); 86 } 87 } 88 return dummy; 89 } 90 quoteTrick(int reps)91 @Benchmark int quoteTrick(int reps) { 92 int dummy = 0; 93 if (useWrapper) { 94 Double d = value.d; 95 for (int i = 0; i < reps; i++) { 96 dummy += ("" + d).length(); 97 } 98 } else { 99 double d = value.d; 100 for (int i = 0; i < reps; i++) { 101 dummy += ("" + d).length(); 102 } 103 } 104 return dummy; 105 } 106 } 107