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Java > Open Source Codes > org > riotfamily > forms > element > select > AbstractSingleSelectElement


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1
3  * The contents of this file are subject to the Mozilla Public License Version
4  * 1.1 (the "License"); you may not use this file except in compliance with
5  * the License. You may obtain a copy of the License at
6  * http://www.mozilla.org/MPL/
7  *
8  * Software distributed under the License is distributed on an "AS IS" basis,
9  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10  * for the specific language governing rights and limitations under the
11  * License.
12  *
13  * The Original Code is Riot.
14  *
15  * The Initial Developer of the Original Code is
16  * Neteye GmbH.
17  * Portions created by the Initial Developer are Copyright (C) 2006
18  * the Initial Developer. All Rights Reserved.
19  *
20  * Contributor(s):
21  * Felix Gnass [fgnass at neteye dot de]
22  *
23  * ***** END LICENSE BLOCK ***** */

24 package org.riotfamily.forms.element.select;
25
26 import org.riotfamily.forms.event.JavaScriptEvent;
27 import org.riotfamily.forms.request.FormRequest;
28
29
30 /**
31  * Abstract superclass for elements that let the user choose from a set of
32  * options like selectboxes or radio button groups.
33  */

34 public abstract class AbstractSingleSelectElement
35         extends AbstractSelectElement {
36     
37     private Object JavaDoc selectedValue;
38     
39     public final void setValue(Object JavaDoc value) {
40         this.selectedValue = value;
41     }
42     
43     public Object JavaDoc getValue() {
44         return selectedValue;
45     }
46
47     protected boolean hasSelection() {
48         return selectedValue != null;
49     }
50     
51     public boolean isSelected(Option option) {
52         return hasSelection() && selectedValue.equals(option.getValue());
53     }
54
55     /**
56      * @see org.riotfamily.forms.AbstractElement#processRequest
57      */

58     public void processRequest(FormRequest request) {
59         updateSelection(request.getParameter(getParamName()));
60     }
61     
62     private void updateSelection(String JavaDoc index) {
63         int i = -1;
64         if (index != null) {
65             i = Integer.parseInt(index);
66         }
67         if (i >= 0) {
68             Option option = (Option) getOptions().get(i);
69             selectedValue = option.getValue();
70         }
71         else {
72             selectedValue = null;
73         }
74         validate();
75     }
76     
77     public void handleJavaScriptEvent(JavaScriptEvent event) {
78         if (event.getType() == JavaScriptEvent.ON_CHANGE) {
79             Object JavaDoc oldValue = selectedValue;
80             updateSelection(event.getValue());
81             fireChangeEvent(selectedValue, oldValue);
82         }
83     }
84
85 }
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