001/* 002 * Copyright 2002-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory.annotation; 018 019import org.springframework.beans.factory.wiring.BeanWiringInfo; 020import org.springframework.beans.factory.wiring.BeanWiringInfoResolver; 021import org.springframework.lang.Nullable; 022import org.springframework.util.Assert; 023import org.springframework.util.ClassUtils; 024 025/** 026 * {@link org.springframework.beans.factory.wiring.BeanWiringInfoResolver} that 027 * uses the Configurable annotation to identify which classes need autowiring. 028 * The bean name to look up will be taken from the {@link Configurable} annotation 029 * if specified; otherwise the default will be the fully-qualified name of the 030 * class being configured. 031 * 032 * @author Rod Johnson 033 * @author Juergen Hoeller 034 * @since 2.0 035 * @see Configurable 036 * @see org.springframework.beans.factory.wiring.ClassNameBeanWiringInfoResolver 037 */ 038public class AnnotationBeanWiringInfoResolver implements BeanWiringInfoResolver { 039 040 @Override 041 @Nullable 042 public BeanWiringInfo resolveWiringInfo(Object beanInstance) { 043 Assert.notNull(beanInstance, "Bean instance must not be null"); 044 Configurable annotation = beanInstance.getClass().getAnnotation(Configurable.class); 045 return (annotation != null ? buildWiringInfo(beanInstance, annotation) : null); 046 } 047 048 /** 049 * Build the {@link BeanWiringInfo} for the given {@link Configurable} annotation. 050 * @param beanInstance the bean instance 051 * @param annotation the Configurable annotation found on the bean class 052 * @return the resolved BeanWiringInfo 053 */ 054 protected BeanWiringInfo buildWiringInfo(Object beanInstance, Configurable annotation) { 055 if (!Autowire.NO.equals(annotation.autowire())) { 056 // Autowiring by name or by type 057 return new BeanWiringInfo(annotation.autowire().value(), annotation.dependencyCheck()); 058 } 059 else if (!annotation.value().isEmpty()) { 060 // Explicitly specified bean name for bean definition to take property values from 061 return new BeanWiringInfo(annotation.value(), false); 062 } 063 else { 064 // Default bean name for bean definition to take property values from 065 return new BeanWiringInfo(getDefaultBeanName(beanInstance), true); 066 } 067 } 068 069 /** 070 * Determine the default bean name for the specified bean instance. 071 * <p>The default implementation returns the superclass name for a CGLIB 072 * proxy and the name of the plain bean class else. 073 * @param beanInstance the bean instance to build a default name for 074 * @return the default bean name to use 075 * @see org.springframework.util.ClassUtils#getUserClass(Class) 076 */ 077 protected String getDefaultBeanName(Object beanInstance) { 078 return ClassUtils.getUserClass(beanInstance).getName(); 079 } 080 081}