1 /*
2 * $Id: ResultDataModel.java,v 1.21.4.1 2008/04/20 20:48:29 rlubke Exp $
3 */
4
5 /*
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
7 *
8 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
9 *
10 * The contents of this file are subject to the terms of either the GNU
11 * General Public License Version 2 only ("GPL") or the Common Development
12 * and Distribution License("CDDL") (collectively, the "License"). You
13 * may not use this file except in compliance with the License. You can obtain
14 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
15 * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
16 * language governing permissions and limitations under the License.
17 *
18 * When distributing the software, include this License Header Notice in each
19 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
20 * Sun designates this particular file as subject to the "Classpath" exception
21 * as provided by Sun in the GPL Version 2 section of the License file that
22 * accompanied this code. If applicable, add the following below the License
23 * Header, with the fields enclosed by brackets [] replaced by your own
24 * identifying information: "Portions Copyrighted [year]
25 * [name of copyright owner]"
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28 *
29 * If you wish your version of this file to be governed by only the CDDL or
30 * only the GPL Version 2, indicate your decision by adding "[Contributor]
31 * elects to include this software in this distribution under the [CDDL or GPL
32 * Version 2] license." If you don't indicate a single choice of license, a
33 * recipient has the option to distribute your version of this file under
34 * either the CDDL, the GPL Version 2 or to extend the choice of license to
35 * its licensees as provided above. However, if you add GPL Version 2 code
36 * and therefore, elected the GPL Version 2 license, then the option applies
37 * only if the new code is made subject to such option by the copyright
38 * holder.
39 */
40
41 package javax.faces.model;
42
43
44 import java.util.SortedMap;
45 import javax.faces.FacesException;
46 import javax.servlet.jsp.jstl.sql.Result;
47
48
49 /**
50 * <p><strong>ResultDataModel</strong> is a convenience implementation of
51 * {@link DataModel} that wraps a JSTL <code>Result</code> object, typically
52 * representing the results of executing an SQL query via JSTL tags.</p>
53 */
54
55 public class ResultDataModel extends DataModel {
56
57
58 // ------------------------------------------------------------ Constructors
59
60
61 /**
62 * <p>Construct a new {@link ResultDataModel} with no specified
63 * wrapped data.</p>
64 */
65 public ResultDataModel() {
66
67 this(null);
68
69 }
70
71
72 /**
73 * <p>Construct a new {@link ResultDataModel} wrapping the specified
74 * <code>Result</code>.</p>
75 *
76 * @param result <code>Result</code> to be wrapped (if any)
77 */
78 public ResultDataModel(Result result) {
79
80 super();
81 setWrappedData(result);
82
83 }
84
85
86 // ------------------------------------------------------ Instance Variables
87
88
89 // The current row index (zero relative)
90 private int index = -1;
91
92
93 // The Result we are wrapping
94 private Result result = null;
95
96
97 // The individual rows of this Result, each represented as a Map
98 // with column names as keys and associated data values as values
99 private SortedMap rows[] = null;
100
101
102 // -------------------------------------------------------------- Properties
103
104
105 /**
106 * <p>Return <code>true</code> if there is <code>wrappedData</code>
107 * available, and the current value of <code>rowIndex</code> is greater
108 * than or equal to zero, and less than the length of the array returned
109 * by calling <code>getRows()</code> on the underlying <code>Result</code>.
110 * Otherwise, return <code>false</code>.</p>
111 *
112 * @throws FacesException if an error occurs getting the row availability
113 */
114 public boolean isRowAvailable() {
115
116 if (result == null) {
117 return (false);
118 } else if ((index >= 0) && (index < rows.length)) {
119 return (true);
120 } else {
121 return (false);
122 }
123
124 }
125
126
127 /**
128 * <p>If there is <code>wrappedData</code> available, return the
129 * length of the array returned by calling <code>getRows()</code>
130 * on the underlying <code>Result</code>. If no <code>wrappedData</code>
131 * is available, return -1.</p>
132 *
133 * @throws FacesException if an error occurs getting the row count
134 */
135 public int getRowCount() {
136
137 if (result == null) {
138 return (-1);
139 }
140 return (rows.length);
141
142 }
143
144
145 /**
146 * <p>If row data is available, return the <code>SortedMap</code> array
147 * element at the index specified by <code>rowIndex</code> of the
148 * array returned by calling <code>getRows()</code> on the underlying
149 * <code>Result</code>. If no wrapped data is available,
150 * return <code>null</code>.</p>
151 *
152 * <p>Note that, if a non-<code>null</code> <code>Map</code> is returned
153 * by this method, it will contain the values of the columns for the
154 * current row, keyed by column name. Column name comparisons must be
155 * performed in a case-insensitive manner.</p>
156 *
157 * @throws FacesException if an error occurs getting the row data
158 * @throws IllegalArgumentException if now row data is available
159 * at the currently specified row index
160 */
161 public Object getRowData() {
162
163 if (result == null) {
164 return (null);
165 } else if (!isRowAvailable()) {
166 throw new NoRowAvailableException();
167 } else {
168 return (rows[index]);
169 }
170
171 }
172
173
174 /**
175 * @throws FacesException {@inheritDoc}
176 */
177 public int getRowIndex() {
178
179 return (index);
180
181 }
182
183
184 /**
185 * @throws FacesException {@inheritDoc}
186 * @throws IllegalArgumentException {@inheritDoc}
187 */
188 public void setRowIndex(int rowIndex) {
189
190 if (rowIndex < -1) {
191 throw new IllegalArgumentException();
192 }
193 int old = index;
194 index = rowIndex;
195 if (result == null) {
196 return;
197 }
198 DataModelListener [] listeners = getDataModelListeners();
199 if ((old != index) && (listeners != null)) {
200 Object rowData = null;
201 if (isRowAvailable()) {
202 rowData = getRowData();
203 }
204 DataModelEvent event =
205 new DataModelEvent(this, index, rowData);
206 int n = listeners.length;
207 for (int i = 0; i < n; i++) {
208 if (null != listeners[i]) {
209 listeners[i].rowSelected(event);
210 }
211 }
212 }
213
214 }
215
216
217 public Object getWrappedData() {
218
219 return (this.result);
220
221 }
222
223
224 /**
225 * @throws ClassCastException if <code>data</code> is
226 * non-<code>null</code> and is not a <code>Result</code>
227 */
228 public void setWrappedData(Object data) {
229
230 if (data == null) {
231 result = null;
232 rows = null;
233 setRowIndex(-1);
234 } else {
235 result = (Result) data;
236 rows = result.getRows();
237 index = -1;
238 setRowIndex(0);
239 }
240
241 }
242
243
244 }
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