1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package javax.faces.model;
20
21 /**
22 * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
23 *
24 * @author Thomas Spiegl (latest modification by $Author: lu4242 $)
25 * @version $Revision: 1154078 $ $Date: 2011-08-04 22:03:06 -0500 (Thu, 04 Aug 2011) $
26 */
27 public class ScalarDataModel extends DataModel
28 {
29 // FIELDS
30 private int _rowIndex = -1;
31 private Object _data;
32
33 // CONSTRUCTORS
34 public ScalarDataModel()
35 {
36 super();
37 }
38
39 public ScalarDataModel(Object scalar)
40 {
41 setWrappedData(scalar);
42 }
43
44 // METHODS
45 public int getRowCount()
46 {
47 return _data != null ? 1 : -1;
48 }
49
50 public Object getRowData()
51 {
52 if (_data == null)
53 {
54 return null;
55 }
56 if (!isRowAvailable())
57 {
58 throw new IllegalArgumentException("row is unavailable");
59 }
60 return _data;
61 }
62
63 public int getRowIndex()
64 {
65 return _rowIndex;
66 }
67
68 public Object getWrappedData()
69 {
70 return _data;
71 }
72
73 public boolean isRowAvailable()
74 {
75 if (_data == null)
76 {
77 return false;
78 }
79 return _rowIndex == 0;
80 }
81
82 public void setRowIndex(int rowIndex)
83 {
84 if (rowIndex < -1)
85 {
86 throw new IllegalArgumentException("illegal rowIndex " + rowIndex);
87 }
88 int oldRowIndex = _rowIndex;
89 _rowIndex = rowIndex;
90 if (_data != null && oldRowIndex != _rowIndex)
91 {
92 Object data = isRowAvailable() ? getRowData() : null;
93 DataModelEvent event = new DataModelEvent(this, _rowIndex, data);
94 DataModelListener[] listeners = getDataModelListeners();
95 for (int i = 0; i < listeners.length; i++)
96 {
97 listeners[i].rowSelected(event);
98 }
99 }
100 }
101
102 public void setWrappedData(Object data)
103 {
104 if (data == null)
105 {
106 setRowIndex(-1);
107 _data = null;
108 }
109 else
110 {
111 _data = data;
112 _rowIndex = -1;
113 setRowIndex(0);
114 }
115 }
116
117 }