InitCapBenchmark

InitCapBenchmark.java

/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import java.util.stream.Stream;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
public class InitCapBenchmark {

    private static final String TEST_VALUE = "One morning, when Gregor Samsa woke from troubled dreams, he found " +
                                             "himself transformed in his bed into a horrible vermin. He lay on his " +
                                             "armour-like back, and if he lifted his head a little he could see his " +
                                             "brown belly, slightly domed and divided by arches into stiff sections. " +
                                             "The bedding was hardly able to cover it and seemed ready to slide off " +
                                             "any moment. His many legs, pitifully thin compared with the size of the " +
                                             "rest of him, waved about helplessly as he looked. " +
                                             "\"What's happened to me?\" he thought. It wasn't a dream. His room, " +
                                             "a proper human room although a little too small, lay peacefully between " +
                                             "its four familiar walls. A collection of textile samples lay spread out " +
                                             "on the table - Samsa was a travelling salesman - and above it there hung " +
                                             "a picture that he had recently cut out of an illustrated magazine and " +
                                             "housed in a nice, gilded frame. It showed a lady fitted out with a fur " +
                                             "hat and fur boa who sat upright, raising a heavy fur muff that covered " +
                                             "the whole of her lower arm towards the viewer. Gregor then turned to " +
                                             "look out the window at the dull weather.";

    private static final String SPLIT_STRING = " ";

    private static String toCapital(String val) {
        if (val.length() == 0) {
            return "";
        }

        char[] chars = new char[val.length()];
        boolean wordStarts = true;
        for (int cp, i = 0, j = 0; i < val.length(); i += Character.charCount(cp)) {
            cp = val.codePointAt(i);

            if (Character.isSpaceChar(cp)) {
                chars[j++] = val.charAt(i);
                wordStarts = true;
                continue;
            }

            if (wordStarts) {
                chars[j++] = (char) Character.toUpperCase(cp);
                wordStarts = false;
            } else {
                chars[j++] = (char) Character.toLowerCase(cp);
            }
        }

        return new String(chars);
    }

    private static String toCapitalStream(String val) {
        Stream<String> tokenStream = Arrays.stream(val.trim().split(SPLIT_STRING));

        return tokenStream
            .map(InitCapBenchmark::toTitleCase)
            .collect(Collectors.joining(SPLIT_STRING));
    }

    private static String toTitleCase(String word) {

        if (word.length() == 0)
            return "";

        char[] chars = word.toCharArray();
        chars[0] = Character.toUpperCase(chars[0]);

        for (int i = 1; i < chars.length; i++)
            chars[i] = Character.toLowerCase(chars[i]);

        return String.copyValueOf(chars);
    }

    @Benchmark
    public void testCapitalizeByToken() {
        for (int i = 0; i < 1000; i++) {
            toCapitalStream(TEST_VALUE);
        }
    }

    @Benchmark
    public void testCapitalize() {
        for (int i = 0; i < 1000; i++) {
            toCapital(TEST_VALUE);
        }
    }
}