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: bommel $)
25 * @version $Revision: 1187701 $ $Date: 2011-10-22 07:21:54 -0500 (Sat, 22 Oct 2011) $
26 */
27 public class ScalarDataModel<E> extends DataModel<E>
28 {
29 // FIELDS
30 private int _rowIndex = -1;
31 private E _data;
32
33 // CONSTRUCTORS
34 public ScalarDataModel()
35 {
36 super();
37 }
38
39 public ScalarDataModel(E scalar)
40 {
41 setWrappedData(scalar);
42 }
43
44 // METHODS
45 @Override
46 public int getRowCount()
47 {
48 return _data != null ? 1 : -1;
49 }
50
51 @Override
52 public E getRowData()
53 {
54 if (_data == null)
55 {
56 return null;
57 }
58 if (!isRowAvailable())
59 {
60 throw new IllegalArgumentException("row is unavailable");
61 }
62 return _data;
63 }
64
65 @Override
66 public int getRowIndex()
67 {
68 return _rowIndex;
69 }
70
71 @Override
72 public Object getWrappedData()
73 {
74 return _data;
75 }
76
77 @Override
78 public boolean isRowAvailable()
79 {
80 return _data != null && _rowIndex == 0;
81 }
82
83 @Override
84 public void setRowIndex(int rowIndex)
85 {
86 if (rowIndex < -1)
87 {
88 throw new IllegalArgumentException("illegal rowIndex " + rowIndex);
89 }
90 int oldRowIndex = _rowIndex;
91 _rowIndex = rowIndex;
92 if (_data != null && oldRowIndex != _rowIndex)
93 {
94 Object data = isRowAvailable() ? getRowData() : null;
95 DataModelEvent event = new DataModelEvent(this, _rowIndex, data);
96 DataModelListener[] listeners = getDataModelListeners();
97 for (int i = 0; i < listeners.length; i++)
98 {
99 listeners[i].rowSelected(event);
100 }
101 }
102 }
103
104 @Override
105 public void setWrappedData(Object data)
106 {
107 if (data == null)
108 {
109 setRowIndex(-1);
110 _data = null;
111 }
112 else
113 {
114 _data = (E) data;
115 _rowIndex = -1;
116 setRowIndex(0);
117 }
118 }
119
120 }