001/* 002 * Copyright 2002-2017 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.lang.Nullable; 020import org.springframework.util.Assert; 021 022/** 023 * Immutable placeholder class used for a property value object when it's a 024 * reference to another bean name in the factory, to be resolved at runtime. 025 * 026 * @author Juergen Hoeller 027 * @since 2.0 028 * @see RuntimeBeanReference 029 * @see BeanDefinition#getPropertyValues() 030 * @see org.springframework.beans.factory.BeanFactory#getBean 031 */ 032public class RuntimeBeanNameReference implements BeanReference { 033 034 private final String beanName; 035 036 @Nullable 037 private Object source; 038 039 040 /** 041 * Create a new RuntimeBeanNameReference to the given bean name. 042 * @param beanName name of the target bean 043 */ 044 public RuntimeBeanNameReference(String beanName) { 045 Assert.hasText(beanName, "'beanName' must not be empty"); 046 this.beanName = beanName; 047 } 048 049 @Override 050 public String getBeanName() { 051 return this.beanName; 052 } 053 054 /** 055 * Set the configuration source {@code Object} for this metadata element. 056 * <p>The exact type of the object will depend on the configuration mechanism used. 057 */ 058 public void setSource(@Nullable Object source) { 059 this.source = source; 060 } 061 062 @Override 063 @Nullable 064 public Object getSource() { 065 return this.source; 066 } 067 068 069 @Override 070 public boolean equals(@Nullable Object other) { 071 if (this == other) { 072 return true; 073 } 074 if (!(other instanceof RuntimeBeanNameReference)) { 075 return false; 076 } 077 RuntimeBeanNameReference that = (RuntimeBeanNameReference) other; 078 return this.beanName.equals(that.beanName); 079 } 080 081 @Override 082 public int hashCode() { 083 return this.beanName.hashCode(); 084 } 085 086 @Override 087 public String toString() { 088 return '<' + getBeanName() + '>'; 089 } 090 091}