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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: 1187700 $ $Date: 2011-10-22 12:19:37 +0000 (Sat, 22 Oct 2011) $
26   */
27  public class ArrayDataModel<E> extends DataModel<E>
28  {
29      // FIELDS
30      private int _rowIndex = -1;
31      private E[] _data;
32  
33      // CONSTRUCTORS
34      public ArrayDataModel()
35      {
36          super();
37      }
38  
39      public ArrayDataModel(E[] array)
40      {
41          if (array == null)
42              throw new NullPointerException("array");
43          setWrappedData(array);
44      }
45  
46      // METHODS
47      @Override
48      public int getRowCount()
49      {
50          if (_data == null)
51          {
52              return -1;
53          }
54          return _data.length;
55      }
56  
57      @Override
58      public E 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[_rowIndex];
69      }
70  
71      @Override
72      public int getRowIndex()
73      {
74          return _rowIndex;
75      }
76  
77      @Override
78      public Object getWrappedData()
79      {
80          return _data;
81      }
82  
83      @Override
84      public boolean isRowAvailable()
85      {
86          return _data != null && _rowIndex >= 0 && _rowIndex < _data.length;
87      }
88  
89      @Override
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     @Override
111     public void setWrappedData(Object data)
112     {
113         if (data == null)
114         {
115             setRowIndex(-1);
116             _data = null;
117         }
118         else
119         {
120             _data = (E[])data;
121             _rowIndex = -1;
122             setRowIndex(0);
123         }
124     }
125 
126 }