spring BeanExpressionContext 源码
spring BeanExpressionContext 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/config/BeanExpressionContext.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.factory.config;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Context object for evaluating an expression within a bean definition.
*
* @author Juergen Hoeller
* @since 3.0
*/
public class BeanExpressionContext {
private final ConfigurableBeanFactory beanFactory;
@Nullable
private final Scope scope;
public BeanExpressionContext(ConfigurableBeanFactory beanFactory, @Nullable Scope scope) {
Assert.notNull(beanFactory, "BeanFactory must not be null");
this.beanFactory = beanFactory;
this.scope = scope;
}
public final ConfigurableBeanFactory getBeanFactory() {
return this.beanFactory;
}
@Nullable
public final Scope getScope() {
return this.scope;
}
public boolean containsObject(String key) {
return (this.beanFactory.containsBean(key) ||
(this.scope != null && this.scope.resolveContextualObject(key) != null));
}
@Nullable
public Object getObject(String key) {
if (this.beanFactory.containsBean(key)) {
return this.beanFactory.getBean(key);
}
else if (this.scope != null) {
return this.scope.resolveContextualObject(key);
}
else {
return null;
}
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!(other instanceof BeanExpressionContext otherContext)) {
return false;
}
return (this.beanFactory == otherContext.beanFactory && this.scope == otherContext.scope);
}
@Override
public int hashCode() {
return this.beanFactory.hashCode();
}
}
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