001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  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,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package org.apache.myfaces.tobago.util;
021    
022    import org.apache.commons.beanutils.PropertyUtils;
023    import org.apache.commons.logging.Log;
024    import org.apache.commons.logging.LogFactory;
025    
026    import java.util.Comparator;
027    import java.io.Serializable;
028    
029    /**
030     * Created: Mon Apr 15 15:56:44 2002
031     */
032    
033    public class BeanComparator extends ComparatorBase implements Serializable {
034    
035      private static final long serialVersionUID = -7450094725566090886L;
036    
037      private static final Log LOG = LogFactory.getLog(BeanComparator.class);
038    
039      private String property;
040    
041      public BeanComparator(String property) {
042        this.property = property;
043      }
044    
045      public BeanComparator(String property, boolean reverse) {
046        super(reverse);
047        this.property = property;
048      }
049    
050      public BeanComparator(String property, Comparator comparator) {
051        super(comparator);
052        this.property = property;
053      }
054    
055      public BeanComparator(String property, Comparator comparator, boolean reverse) {
056        super(reverse, comparator);
057        this.property = property;
058      }
059    
060      /**
061       * @param param1 <description>
062       * @return <description>
063       */
064      public boolean equals(Object param1) {
065        if (this == param1) {
066          return true;
067        }
068        if (param1 instanceof BeanComparator) {
069          return ((BeanComparator) param1).getProperty().equals(property)
070              && super.equals(param1);
071        }
072        return false;
073      }
074    
075      public int hashCode() {
076        int result;
077        result = (property != null ? property.hashCode() : 0);
078        result = 29 * result + super.hashCode();
079        return result;
080      }
081    
082      // implementation of java.util.Comparator interface
083    
084      /**
085       * @param param1 <description>
086       * @param param2 <description>
087       * @return <description>
088       */
089      public int compare(Object param1, Object param2) {
090        Object obj1;
091        Object obj2;
092        try {
093          obj1 = PropertyUtils.getProperty(param1, property);
094          obj2 = PropertyUtils.getProperty(param2, property);
095    
096        } catch (Exception e) {
097          LOG.error(e.getMessage(), e);
098          return 0;
099        }
100    
101        return internalCompare(obj1, obj2);
102      }
103    
104      public String getProperty() {
105        return this.property;
106      }
107    }