spring BeanExpressionResolver 源码
spring BeanExpressionResolver 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/config/BeanExpressionResolver.java
/*
* Copyright 2002-2022 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.beans.BeansException;
import org.springframework.lang.Nullable;
/**
* Strategy interface for resolving a value by evaluating it as an expression,
* if applicable.
*
* <p>A raw {@link org.springframework.beans.factory.BeanFactory} does not
* contain a default implementation of this strategy. However,
* {@link org.springframework.context.ApplicationContext} implementations
* will provide expression support out of the box.
*
* @author Juergen Hoeller
* @since 3.0
*/
public interface BeanExpressionResolver {
/**
* Evaluate the given value as an expression, if applicable;
* return the value as-is otherwise.
* @param value the value to evaluate as an expression
* @param beanExpressionContext the bean expression context to use when
* evaluating the expression
* @return the resolved value (potentially the given value as-is)
* @throws BeansException if evaluation failed
*/
@Nullable
Object evaluate(@Nullable String value, BeanExpressionContext beanExpressionContext) throws BeansException;
}
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