1 /* 2 * Copyright (C) 2010 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 benchmarks.regression; 18 19 import java.nio.charset.Charset; 20 import com.google.caliper.Param; 21 import com.google.caliper.SimpleBenchmark; 22 23 public class CharsetBenchmark extends SimpleBenchmark { 24 @Param({ "1", "10", "100", "1000", "10000" }) 25 private int length; 26 27 // canonical => canonical charset name 28 // built-in => guaranteed-present charset 29 // special-case => libcore treats this charset specially for performance 30 @Param({ 31 "UTF-16", // canonical, built-in, non-special-case 32 "UTF-8", // canonical, built-in, special-case 33 "UTF8", // non-canonical, built-in, special-case 34 "ISO-8859-1", // canonical, built-in, special-case 35 "8859_1", // non-canonical, built-in, special-case 36 "ISO-8859-2", // canonical, non-built-in, non-special-case 37 "8859_2", // non-canonical, non-built-in, non-special-case 38 "US-ASCII", // canonical, built-in, special-case 39 "ASCII" // non-canonical, built-in, special-case 40 }) 41 private String name; 42 43 public void time_new_String_BString(int reps) throws Exception { 44 byte[] bytes = makeBytes(makeString(length)); 45 for (int i = 0; i < reps; ++i) { 46 new String(bytes, name); 47 } 48 } 49 50 public void time_new_String_BII(int reps) throws Exception { 51 byte[] bytes = makeBytes(makeString(length)); 52 for (int i = 0; i < reps; ++i) { 53 new String(bytes, 0, bytes.length); 54 } 55 } 56 57 public void time_new_String_BIIString(int reps) throws Exception { 58 byte[] bytes = makeBytes(makeString(length)); 59 for (int i = 0; i < reps; ++i) { 60 new String(bytes, 0, bytes.length, name); 61 } 62 } 63 64 public void time_String_getBytes(int reps) throws Exception { 65 String string = makeString(length); 66 for (int i = 0; i < reps; ++i) { 67 string.getBytes(name); 68 } 69 } 70 71 private static String makeString(int length) { 72 StringBuilder result = new StringBuilder(length); 73 for (int i = 0; i < length; ++i) { 74 result.append('A' + (i % 26)); 75 } 76 return result.toString(); 77 } 78 79 private static byte[] makeBytes(String s) { 80 try { 81 return s.getBytes("US-ASCII"); 82 } catch (Exception ex) { 83 throw new RuntimeException(ex); 84 } 85 } 86 } 87
