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Java > Open Source Codes > org > apache > tapestry > contrib > table > model > simple > SimpleTableValueRendererSource


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 org.apache.tapestry.IRender;
18 import org.apache.tapestry.IRequestCycle;
19 import org.apache.tapestry.contrib.table.model.ITableColumn;
20 import org.apache.tapestry.contrib.table.model.ITableModelSource;
21 import org.apache.tapestry.contrib.table.model.ITableRendererSource;
22 import org.apache.tapestry.valid.RenderString;
23
24 /**
25  * This is a simple implementation of
26  * {@link org.apache.tapestry.contrib.table.model.ITableRendererSource}
27  * that returns a standard renderer of a column value.
28  *
29  * This implementation requires that the column passed is of type SimpleTableColumn
30  *
31  * @see org.apache.tapestry.contrib.table.model.common.AbstractTableColumn
32  * @author mindbridge
33  * @since 2.3
34  */
35 public class SimpleTableValueRendererSource implements ITableRendererSource
36 {
37     private static final long serialVersionUID = 1L;
38     
39     /**
40      * The representation of null values. This is geared towards HTML, but will
41      * work for some other *ML languages as well. In any case, changing the
42      * column's value renderer allows selecting fully custom rendering behaviour.
43      **/
44     private static final String JavaDoc EMPTY_REPRESENTATION = " ";
45
46     /**
47      * @see org.apache.tapestry.contrib.table.model.ITableRendererSource#getRenderer(IRequestCycle, ITableModelSource, ITableColumn, Object)
48      */
49     public IRender getRenderer(
50         IRequestCycle objCycle,
51         ITableModelSource objSource,
52         ITableColumn objColumn,
53         Object JavaDoc objRow)
54     {
55         SimpleTableColumn objSimpleColumn = (SimpleTableColumn) objColumn;
56
57         Object JavaDoc objValue = objSimpleColumn.getColumnValue(objRow);
58         if (objValue == null)
59             return new RenderString(EMPTY_REPRESENTATION, true);
60
61         return new RenderString(objValue.toString());
62     }
63
64 }
65
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