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Java > Open Source Codes > org > apache > tapestry > binding > ComponentBinding


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.binding;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.Location;
19 import org.apache.hivemind.util.Defense;
20 import org.apache.tapestry.IComponent;
21 import org.apache.tapestry.coerce.ValueConverter;
22
23 /**
24  * A binding where the path is the id of a child component.
25  *
26  * @author Howard M. Lewis Ship
27  * @since 4.0
28  */
29 public class ComponentBinding extends AbstractBinding
30 {
31     private final IComponent _component;
32
33     private final String JavaDoc _componentId;
34
35     public ComponentBinding(String JavaDoc description, ValueConverter valueConverter, Location location,
36             IComponent component, String JavaDoc componentId)
37     {
38         super(description, valueConverter, location);
39
40         Defense.notNull(component, "component");
41         Defense.notNull(componentId, "componentId");
42
43         _component = component;
44         _componentId = componentId;
45     }
46
47     public Object JavaDoc getObject()
48     {
49         try
50         {
51             return _component.getComponent(_componentId);
52         }
53         catch (Exception JavaDoc ex)
54         {
55             throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex);
56         }
57     }
58
59     public Object JavaDoc getComponent()
60     {
61         return _component;
62     }
63
64 }
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