/*
 * 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
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * 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.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.util.Random;
import java.util.concurrent.TimeUnit;
import static java.lang.String.CASE_INSENSITIVE_ORDER;

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

    @Param({"1", "64", "4096"})
    int size;

    private String cmp1_1;
    private String cmp1_2;
    private String cmp2_1;
    private String cmp2_2;

    @Setup
    public void setup() {
        long seed = Long.getLong("seed", 1234567890L);
        String base = newString(seed, size - 1);
        cmp1_1 = new String(base + (char)0x0042);
        cmp1_2 = new String(base.toLowerCase() + (char)0x0043);
        cmp2_1 = new String(base + (char)0x4242);
        cmp2_2 = new String(base.toLowerCase() + (char)0x4243);
    }

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public int cmp1_cmp1() {
        return CASE_INSENSITIVE_ORDER.compare(cmp1_1, cmp1_2);
    }

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public int cmp1_cmp2() {
        return CASE_INSENSITIVE_ORDER.compare(cmp1_1, cmp2_2);
    }

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public int cmp2_cmp1() {
        return CASE_INSENSITIVE_ORDER.compare(cmp2_1, cmp1_2);
    }

    @Benchmark
    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
    public int cmp2_cmp2() {
        return CASE_INSENSITIVE_ORDER.compare(cmp2_1, cmp2_2);
    }


    // from Util
    public static String newString(Random r, int size) {
        char[] cs = new char[size];
        for (int c = 0; c < size; c++) {
            cs[c] = (char) ((char)r.nextInt(Byte.MAX_VALUE) & 0x00FF);
        }
        return new String(cs);
    }

    public static String newString(long seed, int size) {
        return newString(new Random(seed), size);
    }
}