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Java > Open Source Codes > org > apache > tapestry > components > ElseBean


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.components;
16
17 import org.apache.hivemind.HiveMind;
18 import org.apache.tapestry.AbstractComponent;
19 import org.apache.tapestry.IMarkupWriter;
20 import org.apache.tapestry.IRequestCycle;
21
22 /**
23  * @author mb
24  */
25 public abstract class ElseBean extends AbstractComponent
26 {
27     public abstract String JavaDoc getElement();
28     
29     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
30     {
31         Object JavaDoc conditionObject = cycle.getAttribute(IfBean.IF_VALUE_ATTRIBUTE);
32
33         if (conditionObject instanceof Boolean JavaDoc && !((Boolean JavaDoc) conditionObject).booleanValue())
34         {
35             String JavaDoc element = getElement();
36             
37             boolean render = !cycle.isRewinding() && HiveMind.isNonBlank(element);
38             
39             if (render)
40             {
41                 writer.begin(element);
42                 renderInformalParameters(writer, cycle);
43             }
44
45             renderBody(writer, cycle);
46             
47             if (render)
48                 writer.end(element);
49         }
50     }
51 }
52
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