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 * Copyright (c) 2019, 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.util.regex;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

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.concurrent.TimeUnit;

import java.util.regex.Pattern;

import java.util.regex.PatternSyntaxException;

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class PatternBench {

    public String fileTestString;

    public String flagsString;

    public Pattern graphemePattern;

    public Pattern jmodPattern;

    public Pattern jmodCanonicalPattern;

    public String charPatternRegex;

    public String[] charPatternStrings;

    public Pattern charPattern;

    @Setup

    public void setup() {

        flagsString = "\ud83c\udde6\ud83c\uddec\ud83c\uddec\ud83c\udde6\ud83c\uddfa\ud83c\uddf8\ud83c\uddeb\ud83c\uddf7";

        fileTestString = "META-INF/providers/org.openjdk.foo_hotspot_nodes_PluginFactory_EndLockScopeNode";

        graphemePattern = Pattern.compile("\\b{g}");

        String jmodRegex = "^.*(?:(?:_the\\.[^/]*)|(?:_[^/]*\\.marker)|(?:[^/]*\\.diz)|(?:[^/]*\\.debuginfo)|(?:[^/]*\\.dSYM/.*)|(?:[^/]*\\.dSYM)|(?:[^/]*\\.pdb)|(?:[^/]*\\.map))$";

        jmodCanonicalPattern = Pattern.compile(jmodRegex, Pattern.CANON_EQ);

        jmodPattern = Pattern.compile(jmodRegex);

        charPatternRegex = "[ a-zA-Z]*foo[ a-zA-Z0-9]*bar[ a-z]*";

        charPatternStrings = new String[] {"avaaafooddddddbariiii", "lorem ipsum dolor foo bar", "fpp brr lorem ipsum dolor foo bar %", "lorem ipsum dolor foo bar lorem ipsum dolor foo bar lorem ipsum dolor foo bar /"};

        charPattern = Pattern.compile(charPatternRegex);

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public int splitFlags() {

        return graphemePattern.split(flagsString).length;

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public boolean canonicalJmodMatch() {

        return jmodCanonicalPattern.matcher(fileTestString).matches();

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public boolean normalJmodMatch() {

        return jmodPattern.matcher(fileTestString).matches();

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public boolean charPatternMatch() {

        return charPattern.matcher(charPatternStrings[0]).matches()

                && charPattern.matcher(charPatternStrings[1]).matches()

                && charPattern.matcher(charPatternStrings[2]).matches();

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public boolean charPatternMatchWithCompile() {

        Pattern p = Pattern.compile(charPatternRegex);

        return p.matcher(charPatternStrings[0]).matches()

                && p.matcher(charPatternStrings[1]).matches()

                && p.matcher(charPatternStrings[2]).matches();

    }

    @Benchmark

    @Warmup(iterations = 3)

    @Measurement(iterations = 3)

    public Pattern charPatternCompile() {

        return Pattern.compile(charPatternRegex);

    }

}