// Copyright 2007, 2008 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.internal.grid;

 import org.apache.tapestry5.grid.GridDataSource;

 import org.apache.tapestry5.grid.SortConstraint;

 import java.util.List;

 /**

  * An implementation of {@link org.apache.tapestry5.grid.GridDataSource} used when the value null is provided as the

  * source.

  */

 public class NullDataSource implements GridDataSource

 {

     public int getAvailableRows()

     {

         return 0;

     }

     public Class getRowType()

     {

         return null;

     }

     public void prepare(int startIndex, int endIndex, List<SortConstraint> sortConstraints)

     {

     }

     public Object getRowValue(int index)

     {

         return null;

     }

 }