/*
 * Copyright (c) 2016, Oracle America, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of Oracle nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.sample;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.Warmup;

import java.util.List;
import java.util.concurrent.TimeUnit;
import static java.util.stream.Collectors.toList;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5)
@Measurement(iterations = 5)
@Fork(2)
public class AvailableCharsetsCompare {

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public void ASCIICaseInsensitiveComparator() {
        List<String> strings = AVAILABLE_CHARSETS;
        for (String s1 : strings) {
            for (String s2 : strings) {
                sun.misc.ASCIICaseInsensitiveComparator.CASE_INSENSITIVE_ORDER.compare(s1, s2);
            }
        }
    }

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public void StringCaseInsensitiveComparator() {
        List<String> strings = AVAILABLE_CHARSETS;
        for (String s1 : strings) {
            for (String s2 : strings) {
                 String.CASE_INSENSITIVE_ORDER.compare(s1, s2);
            }
        }
    }

    private final static List<String> AVAILABLE_CHARSETS = availableCharsets();

    static List<String> availableCharsets() {
        return java.nio.charset.Charset.availableCharsets()
                                       .keySet()
                                       .stream()
                                       .collect(toList());
    }
}