org.apache.tapestry.contrib.table.model.simple
Class ColumnComparator

java.lang.Object
  org.apache.tapestry.contrib.table.model.simple.ColumnComparator

All Implemented Interfaces:

Comparator

public class ColumnComparator
extends Object
implements Comparator

In order to provide more generic behaviour, ITableColumn has no "column value" concept. The comparator it returns compares two table rows, rather than values specific to the column.

SimpleTableColumn introduces the concept of "column value" and allows one to extract that "column value" from the row using the getColumnValue() method. In practice comparisons are also typically done between these values rather than the full row objects.

This comparator extracts the column values from the rows passed and uses the provided comparator to compare the values. It therefore allows a comparator designed for comparing column values to be quickly wrapped and used as a comparator comparing rows, which is what ITableColumn is expected to return.

Example:

objColumn.setComparator(new ColumnComparator(objColumn, objBeanComparator));

Author:

mindbridge

Constructor Summary

ColumnComparator(SimpleTableColumn objColumn, Comparator objComparator)

Method Summary

int	compare(Object objRow1, Object objRow2)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

ColumnComparator

public ColumnComparator(SimpleTableColumn objColumn,
                        Comparator objComparator)

Method Detail

compare

public int compare(Object objRow1,
                   Object objRow2)

Specified by:

compare in interface Comparator

See Also:

Comparator.compare(Object, Object)