spring BeanReference 源码
spring BeanReference 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/BeanReference.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.expression.spel.ast;
import org.springframework.expression.AccessException;
import org.springframework.expression.BeanResolver;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.SpelEvaluationException;
import org.springframework.expression.spel.SpelMessage;
/**
* Represents a bean reference to a type, for example {@code @foo} or {@code @'foo.bar'}.
* For a FactoryBean the syntax {@code &foo} can be used to access the factory itself.
*
* @author Andy Clement
*/
public class BeanReference extends SpelNodeImpl {
private static final String FACTORY_BEAN_PREFIX = "&";
private final String beanName;
public BeanReference(int startPos, int endPos, String beanName) {
super(startPos, endPos);
this.beanName = beanName;
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
BeanResolver beanResolver = state.getEvaluationContext().getBeanResolver();
if (beanResolver == null) {
throw new SpelEvaluationException(
getStartPosition(), SpelMessage.NO_BEAN_RESOLVER_REGISTERED, this.beanName);
}
try {
return new TypedValue(beanResolver.resolve(state.getEvaluationContext(), this.beanName));
}
catch (AccessException ex) {
throw new SpelEvaluationException(getStartPosition(), ex, SpelMessage.EXCEPTION_DURING_BEAN_RESOLUTION,
this.beanName, ex.getMessage());
}
}
@Override
public String toStringAST() {
StringBuilder sb = new StringBuilder();
if (!this.beanName.startsWith(FACTORY_BEAN_PREFIX)) {
sb.append('@');
}
if (!this.beanName.contains(".")) {
sb.append(this.beanName);
}
else {
sb.append('\'').append(this.beanName).append('\'');
}
return sb.toString();
}
}
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