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.expression; 018 019/** 020 * A bean resolver can be registered with the evaluation context and will kick in 021 * for bean references: {@code @myBeanName} and {@code &myBeanName} expressions. 022 * The <tt>&</tt> variant syntax allows access to the factory bean where relevant. 023 * 024 * @author Andy Clement 025 * @since 3.0.3 026 */ 027public interface BeanResolver { 028 029 /** 030 * Look up a bean by the given name and return a corresponding instance for it. 031 * For attempting access to a factory bean, the name needs a <tt>&</tt> prefix. 032 * @param context the current evaluation context 033 * @param beanName the name of the bean to look up 034 * @return an object representing the bean 035 * @throws AccessException if there is an unexpected problem resolving the bean 036 */ 037 Object resolve(EvaluationContext context, String beanName) throws AccessException; 038 039}