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.context.expression;
018
019import org.springframework.beans.BeansException;
020import org.springframework.beans.factory.BeanFactory;
021import org.springframework.expression.AccessException;
022import org.springframework.expression.BeanResolver;
023import org.springframework.expression.EvaluationContext;
024import org.springframework.util.Assert;
025
026/**
027 * EL bean resolver that operates against a Spring
028 * {@link org.springframework.beans.factory.BeanFactory}.
029 *
030 * @author Juergen Hoeller
031 * @since 3.0.4
032 */
033public class BeanFactoryResolver implements BeanResolver {
034
035        private final BeanFactory beanFactory;
036
037
038        /**
039         * Create a new {@link BeanFactoryResolver} for the given factory.
040         * @param beanFactory the {@link BeanFactory} to resolve bean names against
041         */
042        public BeanFactoryResolver(BeanFactory beanFactory) {
043                Assert.notNull(beanFactory, "BeanFactory must not be null");
044                this.beanFactory = beanFactory;
045        }
046
047
048        @Override
049        public Object resolve(EvaluationContext context, String beanName) throws AccessException {
050                try {
051                        return this.beanFactory.getBean(beanName);
052                }
053                catch (BeansException ex) {
054                        throw new AccessException("Could not resolve bean reference against BeanFactory", ex);
055                }
056        }
057
058}