/*
* $Id: LookupAnnotationParser.java 20321 2010-11-24 15:21:24Z dfeist $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.config.expression;
import org.mule.api.annotations.expressions.Lookup;
import org.mule.api.annotations.meta.Evaluator;
import org.mule.api.expression.ExpressionAnnotationParser;
import org.mule.expression.ExpressionConfig;
import org.mule.expression.transformers.ExpressionArgument;
import org.mule.util.StringUtils;
import java.lang.annotation.Annotation;
/**
* Used to parse Expr parameter annotations
*
* @see org.mule.expression.StringExpressionEvaluator
* @see org.mule.api.annotations.expressions.Expr
*
* @since 3.0
*/
public class LookupAnnotationParser implements ExpressionAnnotationParser
{
public ExpressionArgument parse(Annotation annotation, Class<?> parameterType)
{
Evaluator evaluator = annotation.annotationType().getAnnotation(Evaluator.class);
if (evaluator != null)
{
String expression = ((Lookup) annotation).value();
if(StringUtils.isEmpty(expression))
{
expression = "type:" + parameterType.getName();
}
return new ExpressionArgument(null, new ExpressionConfig(expression,
evaluator.value(), null), ((Lookup) annotation).optional(), parameterType);
}
else
{
throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
}
}
public boolean supports(Annotation annotation)
{
return annotation instanceof Lookup;
}
}