001/* 002 * Copyright 2002-2013 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.support; 018 019import org.springframework.beans.factory.config.BeanDefinitionHolder; 020import org.springframework.beans.factory.config.DependencyDescriptor; 021 022/** 023 * Strategy interface for determining whether a specific bean definition 024 * qualifies as an autowire candidate for a specific dependency. 025 * 026 * @author Juergen Hoeller 027 * @author Mark Fisher 028 * @since 2.5 029 */ 030public interface AutowireCandidateResolver { 031 032 /** 033 * Determine whether the given bean definition qualifies as an 034 * autowire candidate for the given dependency. 035 * @param bdHolder the bean definition including bean name and aliases 036 * @param descriptor the descriptor for the target method parameter or field 037 * @return whether the bean definition qualifies as autowire candidate 038 */ 039 boolean isAutowireCandidate(BeanDefinitionHolder bdHolder, DependencyDescriptor descriptor); 040 041 /** 042 * Determine whether a default value is suggested for the given dependency. 043 * @param descriptor the descriptor for the target method parameter or field 044 * @return the value suggested (typically an expression String), 045 * or {@code null} if none found 046 * @since 3.0 047 */ 048 Object getSuggestedValue(DependencyDescriptor descriptor); 049 050 /** 051 * Build a proxy for lazy resolution of the actual dependency target, 052 * if demanded by the injection point. 053 * @param descriptor the descriptor for the target method parameter or field 054 * @param beanName the name of the bean that contains the injection point 055 * @return the lazy resolution proxy for the actual dependency target, 056 * or {@code null} if straight resolution is to be performed 057 * @since 4.0 058 */ 059 Object getLazyResolutionProxyIfNecessary(DependencyDescriptor descriptor, String beanName); 060 061}