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Java > Open Source Codes > org > apache > tapestry > pageload > QueuedInheritedBinding


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.pageload;
16
17 import org.apache.tapestry.IBinding;
18 import org.apache.tapestry.IComponent;
19
20 /**
21  * Handles connecting an inherited binding. These will be going away soon (if not in release 4.0
22  * itself).
23  *
24  * @author Howard Lewis Ship
25  * @since 4.0
26  */
27 class QueuedInheritedBinding implements IQueuedInheritedBinding
28 {
29     private IComponent _component;
30
31     private String JavaDoc _containerParameterName;
32
33     private String JavaDoc _parameterName;
34
35     QueuedInheritedBinding(IComponent component, String JavaDoc containerParameterName, String JavaDoc parameterName)
36     {
37         _component = component;
38         _containerParameterName = containerParameterName;
39         _parameterName = parameterName;
40     }
41
42     public void connect()
43     {
44         IBinding binding = _component.getContainer().getBinding(_containerParameterName);
45
46         if (binding == null)
47             return;
48
49         // In many cases, a default parameter binding will have been set on the child component
50 // parameter, which
51 // gets overwritten by this inherited binding. There's still a lot of ambiquity concerning
52 // binding
53 // an alias this way.
54
55         _component.setBinding(_parameterName, binding);
56     }
57 }
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