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.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    
025    import javax.faces.context.FacesContext;
026    import javax.faces.el.ValueBinding;
027    import java.util.Comparator;
028    import java.util.Map;
029    
030    /*
031     * Created: Mon Apr 15 15:56:44 2002
032     */
033    
034    public class ValueBindingComparator extends ComparatorBase {
035    
036      private static final Log LOG = LogFactory.getLog(ValueBindingComparator.class);
037    
038      private FacesContext facesContext;
039    
040      private String var;
041    
042      private ValueBinding valueBinding;
043    
044      public ValueBindingComparator(FacesContext facesContext, String var, ValueBinding valueBinding) {
045        this.facesContext = facesContext;
046        this.var = var;
047        this.valueBinding = valueBinding;
048      }
049    
050      public ValueBindingComparator(FacesContext facesContext, String var, ValueBinding valueBinding, boolean reverse) {
051        super(reverse);
052        this.facesContext = facesContext;
053        this.var = var;
054        this.valueBinding = valueBinding;
055      }
056    
057      public ValueBindingComparator(FacesContext facesContext, String var,
058          ValueBinding valueBinding, Comparator comparator) {
059        super(comparator);
060        this.facesContext = facesContext;
061        this.var = var;
062        this.valueBinding = valueBinding;
063      }
064    
065      public ValueBindingComparator(FacesContext facesContext, String var,
066          ValueBinding valueBinding, boolean reverse, Comparator comparator) {
067        super(reverse, comparator);
068        this.facesContext = facesContext;
069        this.var = var;
070        this.valueBinding = valueBinding;
071      }
072    
073      public boolean equals(Object o) {
074        if (this == o) {
075          return true;
076        }
077        if (o == null || getClass() != o.getClass()) {
078          return false;
079        }
080    
081        final ValueBindingComparator that = (ValueBindingComparator) o;
082    
083        if (!super.equals(o)) {
084          return false;
085        }
086        if (facesContext != null ? !facesContext.equals(that.facesContext) : that.facesContext != null) {
087          return false;
088        }
089        if (valueBinding != null ? !valueBinding.equals(that.valueBinding) : that.valueBinding != null) {
090          return false;
091        }
092        if (var != null ? !var.equals(that.var) : that.var != null) {
093          return false;
094        }
095    
096        return true;
097      }
098    
099      public int hashCode() {
100        int result;
101        result = (facesContext != null ? facesContext.hashCode() : 0);
102        result = 29 * result + (var != null ? var.hashCode() : 0);
103        result = 29 * result + (valueBinding != null ? valueBinding.hashCode() : 0);
104        result = 29 * result + super.hashCode();
105        return result;
106      }
107    
108      // implementation of java.util.Comparator interface
109    
110      /**
111       * @param param1 <description>
112       * @param param2 <description>
113       * @return <description>
114       */
115      public int compare(Object param1, Object param2) {
116        Object obj1;
117        Object obj2;
118        try {
119          final Map requestMap = facesContext.getExternalContext().getRequestMap();
120          requestMap.put(var, param1);
121          obj1 = valueBinding.getValue(facesContext);
122          requestMap.put(var, param2);
123          obj2 = valueBinding.getValue(facesContext);
124    
125        } catch (Exception e) {
126          ValueBindingComparator.LOG.error(e.getMessage(), e);
127          return 0;
128        }
129        return super.internalCompare(obj1, obj2);
130      }
131    
132    }