KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > tapestry > contrib > components > Choose


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.contrib.components;
16
17 import org.apache.tapestry.IRender;
18 import org.apache.tapestry.IRequestCycle;
19 import org.apache.tapestry.components.Conditional;
20
21 /**
22  * This component is a container for {@link When} or Otherwise components;
23  * it provides the context for mutually exclusive conditional evaluation.
24  *
25  * [<a HREF="../../../../../../ComponentReference/contrib.Choose.html">Component Reference</a>]
26  *
27  * @author David Solis
28  *
29  */
30 public abstract class Choose extends Conditional {
31
32
33     public void addBody(IRender element)
34     {
35         super.addBody(element);
36         if (element instanceof When)
37             ((When) element).setChoose(this);
38     }
39     
40     protected void cleanupAfterRender(IRequestCycle cycle)
41     {
42         setConditionMet(false);
43         super.cleanupAfterRender(cycle);
44     }
45     
46     protected boolean evaluateCondition()
47     {
48         return getCondition();
49     }
50
51     public boolean getInvert()
52     {
53         // This component doesn't require invert parameter.
54 return false;
55     }
56
57     public abstract boolean getCondition();
58     
59     public abstract boolean isConditionMet();
60     public abstract void setConditionMet(boolean value);
61 }
62
Popular Tags