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Java > Open Source Codes > org > apache > tapestry > wml > SelectionField


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.wml;
16
17 import org.apache.tapestry.IMarkupWriter;
18 import org.apache.tapestry.IRequestCycle;
19 import org.apache.tapestry.form.IPropertySelectionModel;
20
21 /**
22  * SelectionField specifies a postfield element and it is used to complement the
23  * {@link PropertySelection}component.
24  *
25  * @author David Solis
26  * @since 3.0
27  */
28 public abstract class SelectionField extends AbstractPostfield
29 {
30     /**
31      * @see org.apache.tapestry.form.AbstractFormComponent#rewindFormComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
32      */
33     protected void rewindFormComponent(IMarkupWriter writer, IRequestCycle cycle)
34     {
35         String JavaDoc optionValue = cycle.getParameter(getName());
36         IPropertySelectionModel model = getModel();
37         Object JavaDoc value = (optionValue == null) ? null : model.translateValue(optionValue);
38
39         updateValue(value);
40     }
41
42     public abstract IPropertySelectionModel getModel();
43 }
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