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


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 java.lang.reflect.Modifier JavaDoc;
18 import java.util.Iterator JavaDoc;
19
20 import org.apache.hivemind.ErrorLog;
21 import org.apache.hivemind.service.ClassFabUtils;
22 import org.apache.hivemind.service.MethodSignature;
23 import org.apache.hivemind.util.Defense;
24 import org.apache.tapestry.spec.IBeanSpecification;
25 import org.apache.tapestry.spec.IComponentSpecification;
26
27 /**
28  * Injects a property that will dynamically access a managed bean.
29  *
30  * @author Howard M. Lewis Ship
31  * @since 4.0
32  */
33 public class InjectBeanWorker implements EnhancementWorker
34 {
35     private ErrorLog _errorLog;
36
37     public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
38     {
39         Iterator JavaDoc i = spec.getBeanNames().iterator();
40
41         while (i.hasNext())
42         {
43             String JavaDoc name = (String JavaDoc) i.next();
44
45             IBeanSpecification bs = spec.getBeanSpecification(name);
46
47             String JavaDoc propertyName = bs.getPropertyName();
48             if (propertyName != null)
49             {
50                 try
51                 {
52                     injectBean(op, name, propertyName);
53                 }
54                 catch (Exception JavaDoc ex)
55                 {
56                     _errorLog.error(EnhanceMessages.errorAddingProperty(propertyName, op
57                             .getBaseClass(), ex), bs.getLocation(), ex);
58                 }
59             }
60         }
61     }
62
63     public void injectBean(EnhancementOperation op, String JavaDoc beanName, String JavaDoc propertyName)
64     {
65         Defense.notNull(op, "op");
66         Defense.notNull(beanName, "beanName");
67         Defense.notNull(propertyName, "propertyName");
68
69         op.claimProperty(propertyName);
70
71         Class JavaDoc propertyType = EnhanceUtils.extractPropertyType(op, propertyName, null);
72
73         String JavaDoc methodName = op.getAccessorMethodName(propertyName);
74
75         MethodSignature sig = new MethodSignature(propertyType, methodName, null, null);
76
77         // i.e.
78 // return (foo.bar.Baz) getBeans().getBean("baz");
79
80         op.addMethod(Modifier.PUBLIC, sig, "return ("
81                 + ClassFabUtils.getJavaClassName(propertyType) + ") getBeans().getBean(\""
82                 + beanName + "\");");
83     }
84
85     public void setErrorLog(ErrorLog errorLog)
86     {
87         _errorLog = errorLog;
88     }
89 }
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