UselessTranslitBenchmark.java

/*
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.sample;

import org.openjdk.jmh.annotations.*;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 
 Benchmark                         Mode  Cnt   Score   Error  Units
 MyBenchmark.testAllEnglishArray   avgt   20   0.141 ± 0.007  us/op
 MyBenchmark.testAllEnglishMap     avgt   20   0.664 ± 0.011  us/op
 MyBenchmark.testAllEnglishUB      avgt   20  10.780 ± 0.144  us/op
 MyBenchmark.testAllRussiansArray  avgt   20   0.344 ± 0.005  us/op
 MyBenchmark.testAllRussiansMap    avgt   20   0.823 ± 0.053  us/op
 MyBenchmark.testAllRussiansUB     avgt   20  15.692 ± 0.586  us/op

 */

@Fork(value = 2, warmups = 2)
@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 10)
@Measurement(iterations = 10)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class UselessTranslitBenchmark {

    public static String cyrillicToLatin(String lat) {
        if (lat == null) {
            return lat;
        }
        lat = lat.replaceAll("ё", "yo");
        lat = lat.replaceAll("а", "a");
        lat = lat.replaceAll("б", "b");
        lat = lat.replaceAll("в", "v");
        lat = lat.replaceAll("г", "g");
        lat = lat.replaceAll("д", "d");
        lat = lat.replaceAll("е", "e");
        lat = lat.replaceAll("ж", "zh");
        lat = lat.replaceAll("з", "z");
        lat = lat.replaceAll("и", "i");
        lat = lat.replaceAll("й", "y");
        lat = lat.replaceAll("к", "k");
        lat = lat.replaceAll("л", "l");
        lat = lat.replaceAll("м", "m");
        lat = lat.replaceAll("н", "n");
        lat = lat.replaceAll("о", "o");
        lat = lat.replaceAll("п", "p");
        lat = lat.replaceAll("р", "r");
        lat = lat.replaceAll("с", "s");
        lat = lat.replaceAll("т", "t");
        lat = lat.replaceAll("у", "u");
        lat = lat.replaceAll("ф", "f");
        lat = lat.replaceAll("х", "h");
        lat = lat.replaceAll("ц", "c");
        lat = lat.replaceAll("ч", "ch");
        lat = lat.replaceAll("ш", "sh");
        lat = lat.replaceAll("х", "shch");
        lat = lat.replaceAll("ь", "");
        lat = lat.replaceAll("ы", "y");
        lat = lat.replaceAll("ъ", "");
        lat = lat.replaceAll("э", "e");
        lat = lat.replaceAll("ю", "yu");
        lat = lat.replaceAll("я", "ya");

        lat = lat.replaceAll("Ё", "yo");
        lat = lat.replaceAll("А", "a");
        lat = lat.replaceAll("Б", "b");
        lat = lat.replaceAll("В", "v");
        lat = lat.replaceAll("Г", "g");
        lat = lat.replaceAll("Д", "d");
        lat = lat.replaceAll("Е", "e");
        lat = lat.replaceAll("Ж", "zh");
        lat = lat.replaceAll("З", "z");
        lat = lat.replaceAll("И", "i");
        lat = lat.replaceAll("Й", "y");
        lat = lat.replaceAll("К", "k");
        lat = lat.replaceAll("Л", "l");
        lat = lat.replaceAll("М", "m");
        lat = lat.replaceAll("Н", "n");
        lat = lat.replaceAll("О", "o");
        lat = lat.replaceAll("П", "p");
        lat = lat.replaceAll("Р", "r");
        lat = lat.replaceAll("С", "s");
        lat = lat.replaceAll("Т", "t");
        lat = lat.replaceAll("У", "u");
        lat = lat.replaceAll("Ф", "f");
        lat = lat.replaceAll("Х", "h");
        lat = lat.replaceAll("Ц", "c");
        lat = lat.replaceAll("Ч", "ch");
        lat = lat.replaceAll("Ш", "sh");
        lat = lat.replaceAll("Х", "shch");
        lat = lat.replaceAll("Ь", "");
        lat = lat.replaceAll("Ы", "y");
        lat = lat.replaceAll("Ъ", "");
        lat = lat.replaceAll("Э", "e");
        lat = lat.replaceAll("Ю", "yu");
        lat = lat.replaceAll("Я", "ya");
        return lat;
    }

    private static final Map<Character, String> letters = new HashMap<>();

    static {
        letters.put('А', "A");
        letters.put('Б', "B");
        letters.put('В', "V");
        letters.put('Г', "G");
        letters.put('Д', "D");
        letters.put('Е', "E");
        letters.put('Ё', "E");
        letters.put('Ж', "ZH");
        letters.put('З', "Z");
        letters.put('И', "I");
        letters.put('Й', "I");
        letters.put('К', "K");
        letters.put('Л', "L");
        letters.put('М', "M");
        letters.put('Н', "N");
        letters.put('О', "O");
        letters.put('П', "P");
        letters.put('Р', "R");
        letters.put('С', "S");
        letters.put('Т', "T");
        letters.put('У', "U");
        letters.put('Ф', "F");
        letters.put('Х', "H");
        letters.put('Ц', "C");
        letters.put('Ч', "CH");
        letters.put('Ш', "SH");
        letters.put('Щ', "SH");
        letters.put('Ъ', "'");
        letters.put('Ы', "Y");
        letters.put('Ъ', "'");
        letters.put('Э', "E");
        letters.put('Ю', "U");
        letters.put('Я', "YA");
        letters.put('а', "a");
        letters.put('б', "b");
        letters.put('в', "v");
        letters.put('г', "g");
        letters.put('д', "d");
        letters.put('е', "e");
        letters.put('ё', "e");
        letters.put('ж', "zh");
        letters.put('з', "z");
        letters.put('и', "i");
        letters.put('й', "i");
        letters.put('к', "k");
        letters.put('л', "l");
        letters.put('м', "m");
        letters.put('н', "n");
        letters.put('о', "o");
        letters.put('п', "p");
        letters.put('р', "r");
        letters.put('с', "s");
        letters.put('т', "t");
        letters.put('у', "u");
        letters.put('ф', "f");
        letters.put('х', "h");
        letters.put('ц', "c");
        letters.put('ч', "ch");
        letters.put('ш', "sh");
        letters.put('щ', "sh");
        letters.put('ъ', "'");
        letters.put('ы', "y");
        letters.put('ъ', "'");
        letters.put('э', "e");
        letters.put('ю', "u");
        letters.put('я', "ya");
    }

    public static String toTranslit(String text) {
        StringBuilder sb = new StringBuilder(text.length());
        for (int i = 0; i < text.length(); i++) {
            Character c = text.charAt(i);
            sb.append(letters.getOrDefault(c, c.toString()));
        }
        return sb.toString();
    }

    private static final String[] charTable = new String[65535];
    static {
        charTable['А'] = "A";
        charTable['Б'] = "B";
        charTable['В'] = "V";
        charTable['Г'] = "G";
        charTable['Д'] = "D";
        charTable['Е'] = "E";
        charTable['Ё'] = "E";
        charTable['Ж'] = "ZH";
        charTable['З'] = "Z";
        charTable['И'] = "I";
        charTable['Й'] = "I";
        charTable['К'] = "K";
        charTable['Л'] = "L";
        charTable['М'] = "M";
        charTable['Н'] = "N";
        charTable['О'] = "O";
        charTable['П'] = "P";
        charTable['Р'] = "R";
        charTable['С'] = "S";
        charTable['Т'] = "T";
        charTable['У'] = "U";
        charTable['Ф'] = "F";
        charTable['Х'] = "H";
        charTable['Ц'] = "C";
        charTable['Ч'] = "CH";
        charTable['Ш'] = "SH";
        charTable['Щ'] = "SH";
        charTable['Ъ'] = "'";
        charTable['Ы'] = "Y";
        charTable['Ь'] = "'";
        charTable['Э'] = "E";
        charTable['Ю'] = "U";
        charTable['Я'] = "YA";

        for (int i = 0; i < charTable.length; i++) {
            if (charTable[i] != null) {
                char lower = new String(new char[] {(char) i}).toLowerCase().charAt(0);
                charTable[lower] = charTable[i].toLowerCase();
            }
        }
    }

    public static String toTranslitNew(String text) {
        char charBuffer[] = text.toCharArray();
        StringBuilder sb = new StringBuilder(text.length());
        for (char aCharBuffer : charBuffer) {
            String replace = charTable[aCharBuffer];
            if (replace == null) {
                sb.append(aCharBuffer);
            } else {
                sb.append(replace);
            }
        }
        return sb.toString();
    }

    @Benchmark
    public String testAllRussiansUB() {
        return cyrillicToLatin("фыовилФФЫПОВФывитмдилепщыоашыФЫВыоф");
    }

    @Benchmark
    public String testAllEnglishUB() {
        return cyrillicToLatin("adsajhshkadSFBjsajAKSJfhakjsKJAsdha");
    }

    @Benchmark
    public String testAllRussiansMap() {
        return toTranslit("фыовилФФЫПОВФывитмдилепщыоашыФЫВыоф");
    }

    @Benchmark
    public String testAllEnglishMap() {
        return toTranslit("adsajhshkadSFBjsajAKSJfhakjsKJAsdha");
    }

    @Benchmark
    public String testAllRussiansArray() {
        return toTranslitNew("фыовилФФЫПОВФывитмдилепщыоашыФЫВыоф");
    }

    @Benchmark
    public String testAllEnglishArray() {
        return toTranslitNew("adsajhshkadSFBjsajAKSJfhakjsKJAsdha");
    }
}