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      1 /*
      2  * Copyright (C) 2011 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.util.Locale;
     20 import com.google.caliper.Param;
     21 import com.google.caliper.SimpleBenchmark;
     22 
     23 public class StringCaseMappingBenchmark extends SimpleBenchmark {
     24     enum Inputs {
     25         EMPTY(""),
     26 
     27         // TODO: include hairy inputs like turkish and greek.
     28         // TODO: locale makes a difference too.
     29 
     30         LOWER2(lower(2)),
     31         UPPER2(upper(2)),
     32         MIXED2(mixed(2)),
     33 
     34         LOWER8(lower(8)),
     35         UPPER8(upper(8)),
     36         MIXED8(mixed(8)),
     37 
     38         LOWER32(lower(32)),
     39         UPPER32(upper(32)),
     40         MIXED32(mixed(32)),
     41 
     42         LOWER512(lower(512)),
     43         UPPER512(upper(512)),
     44         MIXED512(mixed(512)),
     45 
     46         LOWER2048(lower(2048)),
     47         UPPER2048(upper(2048)),
     48         MIXED2048(mixed(2048)),
     49 
     50         LOWER_1M(lower(1024*1024)),
     51         UPPER_1M(upper(1024*1024)),
     52         MIXED_1M(mixed(1024*1024));
     53 
     54         final String value;
     55         private Inputs(String value) { this.value = value; }
     56         private static String lower(int length) {
     57             return makeString(length, "a0b1c2d3e4f5g6h7i8j9klmnopqrstuvwxyz");
     58         }
     59         private static String upper(int length) {
     60             return makeString(length, "A0B1C2D3E4F5G6H7I8J9KLMNOPQRSTUVWXYZ");
     61         }
     62         private static String mixed(int length) {
     63             return makeString(length, "Aa0Bb1Cc2Dd3Ee4Ff5Gg6Hh7Ii8Jj9KkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz");
     64         }
     65         private static String makeString(int length, String alphabet) {
     66             StringBuilder sb = new StringBuilder(length);
     67             for (int i = 0; i < length; ++i) {
     68                 sb.append(alphabet.charAt(i % alphabet.length()));
     69             }
     70             return sb.toString();
     71         }
     72     }
     73     @Param private Inputs s;
     74 
     75     public void timeToUpperCase_US(int reps) {
     76         for (int i = 0; i < reps; ++i) {
     77             s.value.toUpperCase(Locale.US);
     78         }
     79     }
     80 
     81     public void timeToLowerCase_US(int reps) {
     82         for (int i = 0; i < reps; ++i) {
     83             s.value.toUpperCase(Locale.US);
     84         }
     85     }
     86 
     87     public void timeToUpperCase_Ascii(int reps) {
     88         for (int i = 0; i < reps; ++i) {
     89             toUpperCaseAscii(s.value);
     90         }
     91     }
     92 
     93     public void timeToLowerCase_Ascii(int reps) {
     94         for (int i = 0; i < reps; ++i) {
     95             toUpperCaseAscii(s.value);
     96         }
     97     }
     98 
     99     public void timeToUpperCase_ICU(int reps) {
    100         for (int i = 0; i < reps; ++i) {
    101             libcore.icu.ICU.toUpperCase(s.value, Locale.US.toString());
    102         }
    103     }
    104 
    105     public void timeToLowerCase_ICU(int reps) {
    106         for (int i = 0; i < reps; ++i) {
    107             libcore.icu.ICU.toLowerCase(s.value, Locale.US.toString());
    108         }
    109     }
    110 
    111     public static String toUpperCaseAscii(String s) {
    112         for (int i = 0, length = s.length(); i < length; i++) {
    113             char c = s.charAt(i);
    114             if (c < 'a' || c > 'z') {
    115                 continue; // fast path avoids allocation
    116             }
    117 
    118             // slow path: s contains lower case chars
    119             char[] result = s.toCharArray();
    120             for (; i < length; i++) {
    121                 c = result[i];
    122                 if (c >= 'a' && c <= 'z') {
    123                     result[i] -= ('a' - 'A');
    124                 }
    125             }
    126             return new String(result);
    127         }
    128         return s;
    129     }
    130 
    131     public static String toLowerCaseAscii(String s) {
    132         for (int i = 0, length = s.length(); i < length; i++) {
    133             char c = s.charAt(i);
    134             if (c < 'A' || c > 'Z') {
    135                 continue; // fast path avoids allocation
    136             }
    137 
    138             // slow path: s contains upper case chars
    139             char[] result = s.toCharArray();
    140             for (; i < length; i++) {
    141                 c = result[i];
    142                 if (c >= 'A' && c <= 'Z') {
    143                     result[i] += ('a' - 'A');
    144                 }
    145             }
    146             return new String(result);
    147         }
    148         return s;
    149     }
    150 }
    151