spring BeanExpressionContextAccessor 源码
spring BeanExpressionContextAccessor 代码
文件路径：/spring-context/src/main/java/org/springframework/context/expression/BeanExpressionContextAccessor.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.context.expression;
import org.springframework.beans.factory.config.BeanExpressionContext;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* EL property accessor that knows how to traverse the beans and contextual objects
* of a Spring {@link org.springframework.beans.factory.config.BeanExpressionContext}.
*
* @author Juergen Hoeller
* @author Andy Clement
* @since 3.0
*/
public class BeanExpressionContextAccessor implements PropertyAccessor {
@Override
public boolean canRead(EvaluationContext context, @Nullable Object target, String name) throws AccessException {
return (target instanceof BeanExpressionContext && ((BeanExpressionContext) target).containsObject(name));
}
@Override
public TypedValue read(EvaluationContext context, @Nullable Object target, String name) throws AccessException {
Assert.state(target instanceof BeanExpressionContext, "Target must be of type BeanExpressionContext");
return new TypedValue(((BeanExpressionContext) target).getObject(name));
}
@Override
public boolean canWrite(EvaluationContext context, @Nullable Object target, String name) throws AccessException {
return false;
}
@Override
public void write(EvaluationContext context, @Nullable Object target, String name, @Nullable Object newValue)
throws AccessException {
throw new AccessException("Beans in a BeanFactory are read-only");
}
@Override
public Class<?>[] getSpecificTargetClasses() {
return new Class<?>[] {BeanExpressionContext.class};
}
}
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