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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.openjdk.bench.java.lang.runtime;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
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.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS)
@Fork(3)
public class SwitchEnum {

    public E[] inputs;
    @Setup
    public void setup() {
        inputs = E.values();
    }

    @Benchmark
    public int enumSwitchWithBootstrap() {
        int sum = 0;
        for (E e : inputs) {
            sum += switch (e) {
                case null -> -1;
                case E0 -> 10;
                case E1 -> 11;
                case E2 -> 12;
                case E3 -> 13;
                case E4 -> 14;
                case E5 -> 15;
                case E6 -> 16;
                case E7 -> 17;
                case E8 -> 18;
                case E9 -> 19;
                default -> 17;
            };
        }
        return sum;
    }

    @Benchmark
    public int enumSwitchTraditional() {
        int sum = 0;
        for (E e : inputs) {
            sum += switch (e) {
                case E0 -> 10;
                case E1 -> 11;
                case E2 -> 12;
                case E3 -> 13;
                case E4 -> 14;
                case E5 -> 15;
                case E6 -> 16;
                case E7 -> 17;
                case E8 -> 18;
                case E9 -> 19;
                default -> 17;
            };
        }
        return sum;
    }

    public static void main(String[] args) {
        SwitchEnum s = new SwitchEnum();
        s.setup();
        System.out.println(s.enumSwitchWithBootstrap());
        System.out.println(s.enumSwitchTraditional());
    }

    enum E {
        E0, E1, E2, E3, E4, E5, E6, E7, E8, E9;
    }
}