001 /*--------------------------------------------------------------------------+ 002 $Id: StringLengthComparator.java 26283 2010-02-18 11:18:57Z juergens $ 003 | | 004 | Copyright 2005-2010 Technische Universitaet Muenchen | 005 | | 006 | Licensed under the Apache License, Version 2.0 (the "License"); | 007 | you may not use this file except in compliance with the License. | 008 | You may obtain a copy of the License at | 009 | | 010 | http://www.apache.org/licenses/LICENSE-2.0 | 011 | | 012 | Unless required by applicable law or agreed to in writing, software | 013 | distributed under the License is distributed on an "AS IS" BASIS, | 014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 015 | See the License for the specific language governing permissions and | 016 | limitations under the License. | 017 +--------------------------------------------------------------------------*/ 018 package edu.tum.cs.commons.collections; 019 020 import java.util.Comparator; 021 022 /** 023 * Compares strings by their length. Using this comparator on a list of string 024 * makes shorter strings appear first. 025 * 026 * 027 * @author Florian Deissenboeck 028 * @author $Author: juergens $ 029 * @version $Rev: 26283 $ 030 * @levd.rating GREEN Hash: BBB78877A0FFB47B3C9FB847CA3B4929 031 */ 032 public class StringLengthComparator implements Comparator<String> { 033 034 /** 035 * Compare strings by their length. Using this comparator on a list of 036 * string makes shorter strings appear first. {@inheritDoc} 037 */ 038 public int compare(String string1, String string2) { 039 int length1; 040 int length2; 041 042 if (string1 == null) { 043 length1 = 0; 044 } else { 045 length1 = string1.length(); 046 } 047 048 if (string2 == null) { 049 length2 = 0; 050 } else { 051 length2 = string2.length(); 052 } 053 054 return length1 - length2; 055 } 056 057 }