001    /**
002     * Copyright 2005-2012 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 org.displaytag.model.Cell;
019    import org.kuali.rice.krad.comparator.StringValueComparator;
020    
021    import java.io.Serializable;
022    import java.util.Comparator;
023    
024    public class StringCellComparator implements Comparator, Serializable {
025    
026        static final long serialVersionUID = -183249045552328424L;
027    
028        /*
029         * (non-Javadoc)
030         * 
031         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
032         */
033        public int compare(Object o1, Object o2) {
034            // null guard. non-null value is greater. equal if both are null
035            if (null == o1 || null == o2) {
036                return (null == o1 && null == o2) ? 0 : ((null == o1) ? -1 : 1);
037            }
038            
039            String s1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
040            String s2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
041            
042            return StringValueComparator.getInstance().compare(s1, s2);
043        }
044    }