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package com.willwinder.universalgcodesender.utils;

import org.apache.commons.lang3.StringUtils;

import java.util.Comparator;

/**
 * A comparator that is useful when sorting a list of numbers in a string.
 *
 * @author Joacim Breiler
 */
public class StringNumberComparator implements Comparator {

    @Override
    public int compare(String o1, String o2) {
        // Try to extract only numbers from the strings
        String num1 = o1.replaceAll("\\D", "");
        String num2 = o2.replaceAll("\\D", "");

        // If any of them is empty, just do a string compare
        if(StringUtils.isEmpty(num1) || StringUtils.isEmpty(num2)) {
            return o1.compareTo(o2);
        }

        // Compare only the numbers
        return Integer.parseInt(num1) - Integer.parseInt(num2);
    }
}