Coverage Report - org.apache.tapestry.contrib.table.model.simple.ColumnComparator
 
Classes in this File Line Coverage Branch Coverage Complexity
ColumnComparator
0%
0/7
N/A
1
 
 1  
 // Copyright 2004, 2005 The Apache Software Foundation
 2  
 //
 3  
 // Licensed under the Apache License, Version 2.0 (the "License");
 4  
 // you may not use this file except in compliance with the License.
 5  
 // You may obtain a copy of the License at
 6  
 //
 7  
 //     http://www.apache.org/licenses/LICENSE-2.0
 8  
 //
 9  
 // Unless required by applicable law or agreed to in writing, software
 10  
 // distributed under the License is distributed on an "AS IS" BASIS,
 11  
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12  
 // See the License for the specific language governing permissions and
 13  
 // limitations under the License.
 14  
 
 15  
 package org.apache.tapestry.contrib.table.model.simple;
 16  
 
 17  
 import java.util.Comparator;
 18  
 
 19  
 /**
 20  
  * In order to provide more generic behaviour, ITableColumn has no "column
 21  
  * value" concept. The comparator it returns compares two table rows, rather
 22  
  * than values specific to the column.
 23  
  * <p>
 24  
  * SimpleTableColumn introduces the concept of "column value" and allows one to
 25  
  * extract that "column value" from the row using the getColumnValue() method.
 26  
  * In practice comparisons are also typically done between these values rather
 27  
  * than the full row objects.
 28  
  * <p>
 29  
  * This comparator extracts the column values from the rows passed and uses the
 30  
  * provided comparator to compare the values. It therefore allows a comparator
 31  
  * designed for comparing column values to be quickly wrapped and used as a
 32  
  * comparator comparing rows, which is what ITableColumn is expected to return.
 33  
  * <p>
 34  
  * Example:
 35  
  * <p>
 36  
  * objColumn.setComparator(new ColumnComparator(objColumn, objBeanComparator));
 37  
  * 
 38  
  * @author mindbridge
 39  
  */
 40  
 public class ColumnComparator implements Comparator
 41  
 {
 42  
 
 43  
     private SimpleTableColumn m_objColumn;
 44  
     private Comparator m_objComparator;
 45  
 
 46  
     public ColumnComparator(SimpleTableColumn objColumn,
 47  
             Comparator objComparator)
 48  0
     {
 49  0
         m_objColumn = objColumn;
 50  0
         m_objComparator = objComparator;
 51  0
     }
 52  
 
 53  
     /**
 54  
      * @see java.util.Comparator#compare(Object, Object)
 55  
      */
 56  
     public int compare(Object objRow1, Object objRow2)
 57  
     {
 58  0
         Object objValue1 = m_objColumn.getColumnValue(objRow1);
 59  0
         Object objValue2 = m_objColumn.getColumnValue(objRow2);
 60  
 
 61  0
         return m_objComparator.compare(objValue1, objValue2);
 62  
     }
 63  
 
 64  
 }