package com.ouroboros.experiment.parsetest;

import java.util.concurrent.Callable;
import java.util.regex.Pattern;

import org.apache.commons.lang3.math.NumberUtils;
import org.apache.commons.validator.routines.IntegerValidator;

public class App {
    public static void measure(String name, Callable<Integer> what) throws Exception {
        int iterations = 1000000;
        long starttime = System.currentTimeMillis();

        for (int i = 0; i < iterations; i++) {
            if (what.call() != 434378) throw new Exception("Parsing gave invalid results!");
        }

        long endtime = System.currentTimeMillis();
        System.out.println(name + ": " + (endtime - starttime) + " ms.");
    }

    private static Callable<Integer> ParseWithTryCatch = new Callable<Integer>() {

        public Integer call() throws Exception {
            try {
                return Integer.parseInt("434378");
            } catch (NumberFormatException nfe) {
            }

            return 0;
        }
    };

    private static Callable<Integer> ParseWithRegexCheck = new Callable<Integer>() {

        public Integer call() throws Exception {
            return INT_PATTERN.matcher("434378").matches() ? Integer.parseInt("434378") : 0;
        }
    };

    private static Pattern INT_PATTERN = Pattern.compile("^[-0-9]+$");

    private static Callable<Integer> ParseWithValidator = new Callable<Integer>() {

        public Integer call() throws Exception {
            return IntegerValidator.getInstance().validate("434378");
        }
    };

    private static Callable<Integer> ParseWithNumberUtils = new Callable<Integer>() {

        public Integer call() throws Exception {
            return NumberUtils.toInt("434378");
        }
    };

    public static void main(String[] args) throws Exception {
        measure("try-catch", ParseWithTryCatch);
        measure("regex", ParseWithRegexCheck);
        measure("validator", ParseWithValidator);
        measure("numberutils", ParseWithNumberUtils);
    }
}