| // 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.tapestry.internal.grid; |
| |
| import org.apache.tapestry.grid.GridDataSource; |
| import org.apache.tapestry.grid.SortConstraint; |
| |
| import java.util.List; |
| |
| /** |
| * An implementation of {@link org.apache.tapestry.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; |
| } |
| |
| } |