001 package org.apache.myfaces.tobago.util;
002
003 /*
004 * Licensed to the Apache Software Foundation (ASF) under one or more
005 * contributor license agreements. See the NOTICE file distributed with
006 * this work for additional information regarding copyright ownership.
007 * The ASF licenses this file to You under the Apache License, Version 2.0
008 * (the "License"); you may not use this file except in compliance with
009 * the License. You may obtain a copy of the License at
010 *
011 * http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020 import org.apache.commons.beanutils.PropertyUtils;
021 import org.apache.commons.logging.Log;
022 import org.apache.commons.logging.LogFactory;
023
024 import java.util.Comparator;
025 import java.io.Serializable;
026
027 /**
028 * Created: Mon Apr 15 15:56:44 2002
029 */
030
031 public class BeanComparator extends ComparatorBase implements Serializable {
032
033 private static final long serialVersionUID = -7450094725566090886L;
034
035 private static final Log LOG = LogFactory.getLog(BeanComparator.class);
036
037 private String property;
038
039 public BeanComparator(String property) {
040 this.property = property;
041 }
042
043 public BeanComparator(String property, boolean reverse) {
044 super(reverse);
045 this.property = property;
046 }
047
048 public BeanComparator(String property, Comparator comparator) {
049 super(comparator);
050 this.property = property;
051 }
052
053 public BeanComparator(String property, Comparator comparator, boolean reverse) {
054 super(reverse, comparator);
055 this.property = property;
056 }
057
058 /**
059 * @param param1 <description>
060 * @return <description>
061 */
062 public boolean equals(Object param1) {
063 if (this == param1) {
064 return true;
065 }
066 if (param1 instanceof BeanComparator) {
067 return ((BeanComparator) param1).getProperty().equals(property)
068 && super.equals(param1);
069 }
070 return false;
071 }
072
073 public int hashCode() {
074 int result;
075 result = (property != null ? property.hashCode() : 0);
076 result = 29 * result + super.hashCode();
077 return result;
078 }
079
080 // implementation of java.util.Comparator interface
081
082 /**
083 * @param param1 <description>
084 * @param param2 <description>
085 * @return <description>
086 */
087 public int compare(Object param1, Object param2) {
088 Object obj1;
089 Object obj2;
090 try {
091 obj1 = PropertyUtils.getProperty(param1, property);
092 obj2 = PropertyUtils.getProperty(param2, property);
093
094 } catch (Exception e) {
095 LOG.error(e.getMessage(), e);
096 return 0;
097 }
098
099 return internalCompare(obj1, obj2);
100 }
101
102 public String getProperty() {
103 return this.property;
104 }
105 }