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


1 // Copyright 2005 The Apache Software Foundation
2
//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
14

15 package org.apache.tapestry.components;
16
17 import org.apache.tapestry.AbstractComponent;
18 import org.apache.tapestry.IActionListener;
19 import org.apache.tapestry.IMarkupWriter;
20 import org.apache.tapestry.IRequestCycle;
21 import org.apache.tapestry.link.DirectLink;
22 import org.apache.tapestry.listener.ListenerInvoker;
23
24 /**
25  * Invokes a listener method, passing listener parameters. This is used when a page or component
26  * needs some setup logic that can be best accomplished in Java code.
27  *
28  * @author Howard M. Lewis Ship
29  * @since 4.0
30  */

31 public abstract class InvokeListener extends AbstractComponent
32 {
33     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
34     {
35         Object JavaDoc[] parameters = DirectLink.constructServiceParameters(getParameters());
36
37         try
38         {
39             cycle.setListenerParameters(parameters);
40
41             getListenerInvoker().invokeListener(getListener(), this, cycle);
42         }
43         finally
44         {
45             cycle.setListenerParameters(null);
46         }
47     }
48
49     /** Parameter */
50     public abstract IActionListener getListener();
51
52     /** Parameter */
53     public abstract Object JavaDoc getParameters();
54
55     /** Injected */
56     public abstract ListenerInvoker getListenerInvoker();
57 }
58
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