/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package org.anjocaido.groupmanager.utils;

import java.util.Comparator;

/**
 *
 * @author gabrielcouto
 */
public class StringPermissionComparator implements Comparator<String> {

    @Override
    public int compare(String permA, String permB) {
        boolean ap = permA.startsWith("+");
        boolean bp = permB.startsWith("+");
        boolean am = permA.startsWith("-");
        boolean bm = permB.startsWith("-");
        if(ap&&bp){
            return 0;
        }
        if(ap&&!bp){
            return -1;
        }
        if(!ap&&bp){
            return 1;
        }
        if(am&&bm){
            return 0;
        }
        if(am&&!bm){
            return -1;
        }
        if(!am&&bm){
            return 1;
        }
        return permA.compareToIgnoreCase(permB);
    }
    private static StringPermissionComparator instance;
    public static StringPermissionComparator getInstance(){
        if(instance==null){
            instance = new StringPermissionComparator();
        }
        return instance;
    }

}