KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > jcorporate > expresso > services > html > Radio


1 /* ====================================================================
2  * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
3  *
4  * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in
15  * the documentation and/or other materials provided with the
16  * distribution.
17  *
18  * 3. The end-user documentation included with the redistribution,
19  * if any, must include the following acknowledgment:
20  * "This product includes software developed by Jcorporate Ltd.
21  * (http://www.jcorporate.com/)."
22  * Alternately, this acknowledgment may appear in the software itself,
23  * if and wherever such third-party acknowledgments normally appear.
24  *
25  * 4. "Jcorporate" and product names such as "Expresso" must
26  * not be used to endorse or promote products derived from this
27  * software without prior written permission. For written permission,
28  * please contact info@jcorporate.com.
29  *
30  * 5. Products derived from this software may not be called "Expresso",
31  * or other Jcorporate product names; nor may "Expresso" or other
32  * Jcorporate product names appear in their name, without prior
33  * written permission of Jcorporate Ltd.
34  *
35  * 6. No product derived from this software may compete in the same
36  * market space, i.e. framework, without prior written permission
37  * of Jcorporate Ltd. For written permission, please contact
38  * partners@jcorporate.com.
39  *
40  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
41  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
42  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
43  * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
44  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
45  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
46  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
47  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
48  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
49  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
50  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * ====================================================================
53  *
54  * This software consists of voluntary contributions made by many
55  * individuals on behalf of the Jcorporate Ltd. Contributions back
56  * to the project(s) are encouraged when you make modifications.
57  * Please send them to support@jcorporate.com. For more information
58  * on Jcorporate Ltd. and its products, please see
59  * <http://www.jcorporate.com/>.
60  *
61  * Portions of this software are based upon other open source
62  * products and are subject to their respective licenses.
63  */
64
65 package com.jcorporate.expresso.services.html;
66
67 import java.io.PrintWriter JavaDoc;
68 import java.util.Enumeration JavaDoc;
69 import java.util.Vector JavaDoc;
70
71
72 /**
73  * Encapsulates an HTML radio box on an HTML form
74  *
75  * @author Michael P. Nash
76  * @version $Revision: 1.8 $ $Date: 2004/11/17 20:48:18 $
77  */
78 public class Radio
79         extends HtmlElement {
80     private String JavaDoc fieldName = null;
81     private String JavaDoc currentValue = ("");
82     private Vector JavaDoc values = new Vector JavaDoc(3);
83     private Vector JavaDoc labels = new Vector JavaDoc(3);
84     private String JavaDoc thisClass = (this.getClass().getName() + ".");
85     private boolean isVertical = false;
86
87     /**
88      * Constructor Create a new Radio list with the specified field name
89      *
90      * @param newFieldName Field name of the new drop down, must not be null
91      * @throws HtmlException If the parameter is invalid
92      */
93     public Radio(String JavaDoc newFieldName)
94             throws HtmlException {
95         super(newFieldName);
96
97         String JavaDoc myName = (thisClass + "Radio(String)");
98
99         if (newFieldName == null) {
100             throw new HtmlException(myName +
101                     ":Field name must not be null for " +
102                     getName());
103         }
104
105         fieldName = newFieldName;
106     } /* Radio(String) */
107
108     /**
109      * Create a drop down with the field name as given with a specific current value
110      *
111      * @param newFieldName Field name of the new radio
112      * @param newCurrentValue Current value of the drop down (selected item)
113      * @throws HtmlException If the parameters are invalid
114      */
115     public Radio(String JavaDoc newFieldName, String JavaDoc newCurrentValue)
116             throws HtmlException {
117         super(newFieldName);
118         fieldName = newFieldName;
119         currentValue = newCurrentValue;
120     } /* Radio(String, String) */
121
122     /**
123      * Add a new option to this radio
124      *
125      * @param fieldValue Value of the new option
126      * @param fieldLabel Label of the new option
127      * @throws HtmlException If the parameters are invalid
128      */
129     public synchronized void addOption(String JavaDoc fieldValue, String JavaDoc fieldLabel)
130             throws HtmlException {
131         values.addElement(fieldValue);
132         labels.addElement(fieldLabel);
133     } /* addOption(String, String) */
134
135
136     /**
137      * Display this Radio to the appropriate PrintWriter
138      *
139      * @param depth the number of tabs to indent
140      * @param out PrintWriter to display
141      * @throws HtmlException If the Radio cannot be displayed
142      */
143     protected synchronized void display(PrintWriter JavaDoc out, int depth)
144             throws HtmlException {
145         String JavaDoc myName = (thisClass + "display(PrintWriter)");
146
147         if (values.size() == 0) {
148             throw new HtmlException(myName + ":Radio " + getName() +
149                     " has no choices");
150         }
151
152         String JavaDoc oneValue = null;
153         String JavaDoc oneLabel = null;
154         Enumeration JavaDoc e2 = labels.elements();
155
156         for (Enumeration JavaDoc e = values.elements(); e.hasMoreElements();) {
157             oneValue = (String JavaDoc) e.nextElement();
158             oneLabel = (String JavaDoc) e2.nextElement();
159
160             if (isVertical) {
161                 this.padWithTabs(out, depth);
162                 out.print("<br />");
163             }
164             if (currentValue.equals(oneValue)) {
165                 this.padWithTabs(out, depth);
166                 out.println("<input type=radio name=\"" + fieldName +
167                         "\" checked value=\"" + oneValue + "\">" +
168                         oneLabel);
169             } else {
170                 this.padWithTabs(out, depth);
171                 out.println("<input type=radio NAME=\"" + fieldName +
172                         "\" value=\"" + oneValue + "\">" + oneLabel);
173             }
174         }
175
176         this.padWithTabs(out, depth);
177         out.println("</input>");
178         setDisplayed();
179     } /* display(PrintWriter) */
180
181
182     /**
183      * Set the currently selected value for this radio
184      *
185      * @param newCurrentValue The value for this drop down
186      * @throws HtmlException If the parameter is invalid
187      */
188     public void setCurrentValue(String JavaDoc newCurrentValue)
189             throws HtmlException {
190         currentValue = newCurrentValue;
191     } /* setCurrentValue(String) */
192
193
194     /**
195      * @param state set to true for vertical radio buttons
196      */
197     public void setVertical(boolean state) {
198         isVertical = state;
199     } /* setVertical(boolean) */
200
201 } /* Radio */
202
203 /* Radio */
Popular Tags