Paul Duffin | 7fc0b45 | 2015-11-10 17:45:15 +0000 | [diff] [blame^] | 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.Param; |
| 20 | import com.google.caliper.Runner; |
| 21 | import com.google.caliper.SimpleBenchmark; |
| 22 | |
| 23 | import java.util.Arrays; |
| 24 | import java.util.List; |
| 25 | |
| 26 | /** |
| 27 | * Measures the various ways the JDK converts doubles to strings. |
| 28 | */ |
| 29 | public class DoubleToStringBenchmark extends SimpleBenchmark { |
| 30 | @Param Method method; |
| 31 | |
| 32 | public enum Method { |
| 33 | TO_STRING { |
| 34 | @Override String convert(double d) { |
| 35 | return ((Double) d).toString(); |
| 36 | } |
| 37 | @Override String convert(Double d) { |
| 38 | return d.toString(); |
| 39 | } |
| 40 | }, |
| 41 | STRING_VALUE_OF { |
| 42 | @Override String convert(double d) { |
| 43 | return String.valueOf(d); |
| 44 | } |
| 45 | @Override String convert(Double d) { |
| 46 | return String.valueOf(d); |
| 47 | } |
| 48 | }, |
| 49 | STRING_FORMAT { |
| 50 | @Override String convert(double d) { |
| 51 | return String.format("%f", d); |
| 52 | } |
| 53 | @Override String convert(Double d) { |
| 54 | return String.format("%f", d); |
| 55 | } |
| 56 | }, |
| 57 | QUOTE_TRICK { |
| 58 | @Override String convert(double d) { |
| 59 | return "" + d; |
| 60 | } |
| 61 | @Override String convert(Double d) { |
| 62 | return "" + d; |
| 63 | } |
| 64 | }, |
| 65 | ; |
| 66 | |
| 67 | abstract String convert(double d); |
| 68 | abstract String convert(Double d); |
| 69 | } |
| 70 | |
| 71 | enum Value { |
| 72 | Pi(Math.PI), |
| 73 | NegativeZero(-0.0), |
| 74 | NegativeInfinity(Double.NEGATIVE_INFINITY), |
| 75 | NaN(Double.NaN); |
| 76 | |
| 77 | final double value; |
| 78 | |
| 79 | Value(double value) { |
| 80 | this.value = value; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | @Param Value value; |
| 85 | |
| 86 | public int timePrimitive(int reps) { |
| 87 | double d = value.value; |
| 88 | int dummy = 0; |
| 89 | for (int i = 0; i < reps; i++) { |
| 90 | dummy += method.convert(d).length(); |
| 91 | } |
| 92 | return dummy; |
| 93 | } |
| 94 | |
| 95 | public int timeWrapper(int reps) { |
| 96 | Double d = value.value; |
| 97 | int dummy = 0; |
| 98 | for (int i = 0; i < reps; i++) { |
| 99 | dummy += method.convert(d).length(); |
| 100 | } |
| 101 | return dummy; |
| 102 | } |
| 103 | |
| 104 | public static void main(String[] args) throws Exception { |
| 105 | Runner.main(DoubleToStringBenchmark.class, args); |
| 106 | } |
| 107 | } |