spring EmbeddedValueResolver 源码
spring EmbeddedValueResolver 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/config/EmbeddedValueResolver.java
/*
* Copyright 2002-2017 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.StringValueResolver;
/**
* {@link StringValueResolver} adapter for resolving placeholders and
* expressions against a {@link ConfigurableBeanFactory}.
*
* <p>Note that this adapter resolves expressions as well, in contrast
* to the {@link ConfigurableBeanFactory#resolveEmbeddedValue} method.
* The {@link BeanExpressionContext} used is for the plain bean factory,
* with no scope specified for any contextual objects to access.
*
* @author Juergen Hoeller
* @since 4.3
* @see ConfigurableBeanFactory#resolveEmbeddedValue(String)
* @see ConfigurableBeanFactory#getBeanExpressionResolver()
* @see BeanExpressionContext
*/
public class EmbeddedValueResolver implements StringValueResolver {
private final BeanExpressionContext exprContext;
@Nullable
private final BeanExpressionResolver exprResolver;
public EmbeddedValueResolver(ConfigurableBeanFactory beanFactory) {
this.exprContext = new BeanExpressionContext(beanFactory, null);
this.exprResolver = beanFactory.getBeanExpressionResolver();
}
@Override
@Nullable
public String resolveStringValue(String strVal) {
String value = this.exprContext.getBeanFactory().resolveEmbeddedValue(strVal);
if (this.exprResolver != null && value != null) {
Object evaluated = this.exprResolver.evaluate(value, this.exprContext);
value = (evaluated != null ? evaluated.toString() : null);
}
return value;
}
}
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