/*
* Copyright 2002-2010 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
*
* http://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 "@foo" or "@'foo.bar'"
*
* @author Andy Clement
*/
public class BeanReference extends SpelNodeImpl {
private String beanname;
public BeanReference(int pos,String beanname) {
super(pos);
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, beanname);
}
try {
TypedValue bean = new TypedValue(beanResolver.resolve(state.getEvaluationContext(),beanname));
return bean;
} catch (AccessException ae) {
throw new SpelEvaluationException( getStartPosition(), ae, SpelMessage.EXCEPTION_DURING_BEAN_RESOLUTION,
beanname, ae.getMessage());
}
}
@Override
public String toStringAST() {
StringBuilder sb = new StringBuilder();
sb.append("@");
if (beanname.indexOf('.')==-1) {
sb.append(beanname);
} else {
sb.append("'").append(beanname).append("'");
}
return sb.toString();
}
}
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