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Java > Open Source Codes > org > apache > tapestry > enhance > InjectSpecificationWorker


1 // Copyright 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.enhance;
16
17 import org.apache.hivemind.ErrorLog;
18 import org.apache.hivemind.util.Defense;
19 import org.apache.tapestry.spec.IComponentSpecification;
20
21 /**
22  * Injects the component's specification as the
23  * {@link org.apache.tapestry.IComponent#getSpecification() specification}property.
24  *
25  * @author Howard M. Lewis Ship
26  * @since 4.0
27  */
28 public class InjectSpecificationWorker implements EnhancementWorker
29 {
30     public static final String JavaDoc SPECIFICATION_PROPERTY_NAME = "specification";
31
32     private ErrorLog _errorLog;
33
34     public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
35     {
36         try
37         {
38             injectSpecification(op, spec);
39         }
40         catch (Exception JavaDoc ex)
41         {
42             _errorLog.error(EnhanceMessages.errorAddingProperty(SPECIFICATION_PROPERTY_NAME, op
43                     .getBaseClass(), ex), spec.getLocation(), ex);
44         }
45     }
46
47     public void injectSpecification(EnhancementOperation op, IComponentSpecification spec)
48     {
49         Defense.notNull(op, "op");
50         Defense.notNull(spec, "spec");
51
52         op.claimProperty(SPECIFICATION_PROPERTY_NAME);
53
54         String JavaDoc fieldName = op.addInjectedField(
55                 "_$" + SPECIFICATION_PROPERTY_NAME,
56                 IComponentSpecification.class,
57                 spec);
58
59         EnhanceUtils.createSimpleAccessor(
60                 op,
61                 fieldName,
62                 SPECIFICATION_PROPERTY_NAME,
63                 IComponentSpecification.class);
64     }
65
66     public void setErrorLog(ErrorLog errorLog)
67     {
68         _errorLog = errorLog;
69     }
70 }
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