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


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.tapestry.AbstractComponent;
18 import org.apache.tapestry.IMarkupWriter;
19 import org.apache.tapestry.IRender;
20 import org.apache.tapestry.IRequestCycle;
21
22 /**
23  * A component which delegates it's behavior to another object.
24  *
25  * [<a HREF="../../../../../ComponentReference/Delegator.html">Component Reference</a>]
26  *
27  * @author Howard Lewis Ship
28  *
29  **/
30
31 public abstract class Delegator extends AbstractComponent
32 {
33     /**
34      * Gets its delegate and invokes {@link IRender#render(IMarkupWriter, IRequestCycle)}
35      * on it.
36      *
37      **/
38
39     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
40     {
41         IRender delegate = getDelegate();
42         
43         if (delegate != null)
44             delegate.render(writer, cycle);
45     }
46     
47     public abstract IRender getDelegate();
48 }
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