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.config; 018 019import org.springframework.util.Assert; 020 021/** 022 * Context object for evaluating an expression within a bean definition. 023 * 024 * @author Juergen Hoeller 025 * @since 3.0 026 */ 027public class BeanExpressionContext { 028 029 private final ConfigurableBeanFactory beanFactory; 030 031 private final Scope scope; 032 033 034 public BeanExpressionContext(ConfigurableBeanFactory beanFactory, Scope scope) { 035 Assert.notNull(beanFactory, "BeanFactory must not be null"); 036 this.beanFactory = beanFactory; 037 this.scope = scope; 038 } 039 040 public final ConfigurableBeanFactory getBeanFactory() { 041 return this.beanFactory; 042 } 043 044 public final Scope getScope() { 045 return this.scope; 046 } 047 048 049 public boolean containsObject(String key) { 050 return (this.beanFactory.containsBean(key) || 051 (this.scope != null && this.scope.resolveContextualObject(key) != null)); 052 } 053 054 public Object getObject(String key) { 055 if (this.beanFactory.containsBean(key)) { 056 return this.beanFactory.getBean(key); 057 } 058 else if (this.scope != null) { 059 return this.scope.resolveContextualObject(key); 060 } 061 else { 062 return null; 063 } 064 } 065 066 067 @Override 068 public boolean equals(Object other) { 069 if (this == other) { 070 return true; 071 } 072 if (!(other instanceof BeanExpressionContext)) { 073 return false; 074 } 075 BeanExpressionContext otherContext = (BeanExpressionContext) other; 076 return (this.beanFactory == otherContext.beanFactory && this.scope == otherContext.scope); 077 } 078 079 @Override 080 public int hashCode() { 081 return this.beanFactory.hashCode(); 082 } 083 084}