/*
 * This file is part of Nuts Framework.
 * Copyright(C) 2009-2012 Nuts Develop Team.
 *
 * Nuts Framework is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License any later version.
 * 
 * Nuts Framework 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Nuts Framework. If not, see <http://www.gnu.org/licenses/>.
 */
package nuts.core.util.comparator;


/**
 * length comparator for string
 */
public class StringLengthComparator extends AbstractComparator<String> {
	/**
	 * @param o1 string1
	 * @param o2 string2
     * @return a negative integer, zero, or a positive integer as the
     * 	       first argument is less than, equal to, or greater than the
     *	       second.
	 */
	protected int _compare(String o1, String o2) {
		int len1 = o1 == null ? 0 : o1.length();
		int len2 = o2 == null ? 0 : o2.length();
		return len1 - len2;
	}
}
