001    /*
002     * Copyright 2006-2008 The Kuali Foundation
003     * 
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     * http://www.opensource.org/licenses/ecl2.php
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kns.web.comparator;
017    
018    import java.io.Serializable;
019    import java.util.Comparator;
020    
021    import org.displaytag.model.Cell;
022    
023    public class NumericCellComparator implements Comparator, Serializable {
024    
025        static final long serialVersionUID = 3449202365486147519L;
026    
027        public int compare(Object o1, Object o2) {
028    
029            // null guard. non-null value is greater. equal if both are null
030            if (null == o1 || null == o2) {
031                return (null == o1 && null == o2) ? 0 : ((null == o1) ? -1 : 1);
032            }
033    
034            String numericCompare1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
035            String numericCompare2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
036    
037            return NumericValueComparator.getInstance().compare(numericCompare1, numericCompare2);
038        }
039    
040    }