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Java > Open Source Codes > org > springframework > beans > factory > annotation > AnnotationBeanWiringInfoResolver


1 /*
2  * Copyright 2002-2007 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.springframework.beans.factory.annotation;
18
19 import org.springframework.beans.factory.wiring.BeanWiringInfo;
20 import org.springframework.beans.factory.wiring.BeanWiringInfoResolver;
21 import org.springframework.util.Assert;
22 import org.springframework.util.ClassUtils;
23
24 /**
25  * {@link org.springframework.beans.factory.wiring.BeanWiringInfoResolver} that
26  * uses the Configurable annotation to identify which classes need autowiring.
27  * The bean name to look up will be taken from the {@link Configurable} annotation
28  * if specified; otherwise the default will be the fully-qualified name of the
29  * class being configured.
30  *
31  * @author Rod Johnson
32  * @author Juergen Hoeller
33  * @since 2.0
34  * @see Configurable
35  * @see org.springframework.beans.factory.wiring.ClassNameBeanWiringInfoResolver
36  */
37 public class AnnotationBeanWiringInfoResolver implements BeanWiringInfoResolver {
38
39     public BeanWiringInfo resolveWiringInfo(Object JavaDoc beanInstance) {
40         Assert.notNull(beanInstance, "Bean instance must not be null");
41         Configurable annotation = beanInstance.getClass().getAnnotation(Configurable.class);
42         return (annotation != null ? buildWiringInfo(beanInstance, annotation) : null);
43     }
44
45     /**
46      * Build the BeanWiringInfo for the given Configurable annotation.
47      * @param beanInstance the bean instance
48      * @param annotation the Configurable annotation found on the bean class
49      * @return the resolved BeanWiringInfo
50      */
51     protected BeanWiringInfo buildWiringInfo(Object JavaDoc beanInstance, Configurable annotation) {
52         if (!Autowire.NO.equals(annotation.autowire())) {
53             return new BeanWiringInfo(annotation.autowire().value(), annotation.dependencyCheck());
54         }
55         else {
56             String JavaDoc beanName =
57                     (!"".equals(annotation.value()) ? annotation.value() : getDefaultBeanName(beanInstance));
58             return new BeanWiringInfo(beanName);
59         }
60     }
61
62     /**
63      * Determine the default bean name for the specified bean instance.
64      * <p>The default implementation returns the superclass name for a CGLIB
65      * proxy and the name of the plain bean class else.
66      * @param beanInstance the bean instance to build a default name for
67      * @return the default bean name to use
68      * @see org.springframework.util.ClassUtils#getUserClass(Class)
69      */
70     protected String JavaDoc getDefaultBeanName(Object JavaDoc beanInstance) {
71         return ClassUtils.getUserClass(beanInstance).getName();
72     }
73
74 }
75
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