/*

 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package org.openjdk.bench.java.lang;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OperationsPerInvocation;

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.infra.Blackhole;

import java.util.Random;

import java.util.concurrent.TimeUnit;

/**

 * Tests for sun.misc.FloatingDecimal. Performs floating point number to String conversions.

 */

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class FloatingDecimal {

    private double[] randomArray, twoDecimalsArray, integerArray;

    private static final int TESTSIZE = 1000;

    @Setup

    public void setup() {

        Random r = new Random(1123);

        randomArray = new double[TESTSIZE];

        twoDecimalsArray = new double[TESTSIZE];

        integerArray = new double[TESTSIZE];

        for (int i = 0; i < TESTSIZE; i++) {

            randomArray[i] = r.nextDouble() * 10000.0D;

            twoDecimalsArray[i] = ((double) (10000 - r.nextInt(20000))) / 100;

            integerArray[i] = (double) (100 - r.nextInt(200));

        }

    }

    /** Tests Double.toString on double values generated from Random.nextDouble() */

    @Benchmark

    @OperationsPerInvocation(TESTSIZE)

    public void randomDoubleToString(Blackhole bh) {

        for (double d : randomArray) {

            bh.consume(Double.toString(d));

        }

    }

    /** Tests Double.toString on double values that are integers between -100 and 100. */

    @Benchmark

    @OperationsPerInvocation(TESTSIZE)

    public void integerDoubleToString(Blackhole bh) {

        for (double d : integerArray) {

            bh.consume(Double.toString(d));

        }

    }

    /** Tests Double.toString on double values that are between -100 and 100 and have two decimal digits. */

    @Benchmark

    @OperationsPerInvocation(TESTSIZE)

    public void twoDecimalsDoubleToString(Blackhole bh) {

        for (double d : twoDecimalsArray) {

            bh.consume(Double.toString(d));

        }

    }

}