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 import java.util.List;
22
23 /**
24 * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
25 *
26 * @author Thomas Spiegl (latest modification by $Author: lu4242 $)
27 * @version $Revision: 1154078 $ $Date: 2011-08-04 22:03:06 -0500 (Thu, 04 Aug 2011) $
28 */
29 public class ListDataModel extends DataModel
30 {
31
32 // FIELDS
33 private int _rowIndex = -1;
34 private List _data;
35
36 // CONSTRUCTORS
37 public ListDataModel()
38 {
39 super();
40 }
41
42 public ListDataModel(List list)
43 {
44 if (list == null) throw new NullPointerException("list");
45 setWrappedData(list);
46 }
47
48 // METHODS
49 public int getRowCount()
50 {
51 if (_data == null)
52 {
53 return -1;
54 }
55 return _data.size();
56 }
57
58 public Object getRowData()
59 {
60 if (_data == null)
61 {
62 return null;
63 }
64 if (!isRowAvailable())
65 {
66 throw new IllegalArgumentException("row is unavailable");
67 }
68 return _data.get(_rowIndex);
69 }
70
71 public int getRowIndex()
72 {
73 return _rowIndex;
74 }
75
76 public Object getWrappedData()
77 {
78 return _data;
79 }
80
81 public boolean isRowAvailable()
82 {
83 if (_data == null)
84 {
85 return false;
86 }
87 return _rowIndex >= 0 && _rowIndex < _data.size();
88 }
89
90 public void setRowIndex(int rowIndex)
91 {
92 if (rowIndex < -1)
93 {
94 throw new IllegalArgumentException("illegal rowIndex " + rowIndex);
95 }
96 int oldRowIndex = _rowIndex;
97 _rowIndex = rowIndex;
98 if (_data != null && oldRowIndex != _rowIndex)
99 {
100 Object data = isRowAvailable() ? getRowData() : null;
101 DataModelEvent event = new DataModelEvent(this, _rowIndex, data);
102 DataModelListener[] listeners = getDataModelListeners();
103 for (int i = 0; i < listeners.length; i++)
104 {
105 listeners[i].rowSelected(event);
106 }
107 }
108 }
109
110 public void setWrappedData(Object data)
111 {
112 if (data == null)
113 {
114 setRowIndex(-1);
115 _data = null;
116 }
117 else
118 {
119 _data = (List)data;
120 _rowIndex = -1;
121 setRowIndex(0);
122 }
123 }
124
125 }