01: // Copyright 2007 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // 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.internal.grid;
16:
17: import org.apache.tapestry.beaneditor.PropertyModel;
18: import org.apache.tapestry.grid.GridDataSource;
19:
20: /**
21: * An implementation of {@link GridDataSource} used when the value null is provided as the source.
22: */
23: public class NullDataSource implements GridDataSource {
24: public int getAvailableRows() {
25: return 0;
26: }
27:
28: public Class getRowType() {
29: return null;
30: }
31:
32: public void prepare(int startIndex, int endIndex,
33: PropertyModel sortModel, boolean ascending) {
34: }
35:
36: public Object getRowValue(int index) {
37: return null;
38: }
39:
40: }
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