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}