001/*-------------------------------------------------------------------------+
002|                                                                          |
003| Copyright 2005-2011 the ConQAT Project                                   |
004|                                                                          |
005| Licensed under the Apache License, Version 2.0 (the "License");          |
006| you may not use this file except in compliance with the License.         |
007| You may obtain a copy of the License at                                  |
008|                                                                          |
009|    http://www.apache.org/licenses/LICENSE-2.0                            |
010|                                                                          |
011| Unless required by applicable law or agreed to in writing, software      |
012| distributed under the License is distributed on an "AS IS" BASIS,        |
013| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
014| See the License for the specific language governing permissions and      |
015| limitations under the License.                                           |
016+-------------------------------------------------------------------------*/
017package org.conqat.lib.commons.collections;
018
019import java.util.Comparator;
020
021/**
022 * A comparator for strings that sorts numbers (represented as strings)
023 * "correctly".
024 */
025public class SmartStringComparator implements Comparator<String> {
026
027        /** {@inheritDoc} */
028        @Override
029        public int compare(String s1, String s2) {
030                try {
031                        double d1 = Double.parseDouble(s1);
032                        double d2 = Double.parseDouble(s2);
033                        return Double.compare(d1, d2);
034                } catch (NumberFormatException e) {
035                        // compare based on strings
036                        return s1.compareTo(s2);
037                }
038        }
039}