/*
* $Id: InboundHeadersAnnotationParser.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.parsers;
import org.mule.api.annotations.meta.Evaluator;
import org.mule.api.annotations.param.InboundHeaders;
import org.mule.api.expression.ExpressionAnnotationParser;
import org.mule.expression.ExpressionConfig;
import org.mule.expression.MessageHeaderExpressionEvaluator;
import org.mule.expression.MessageHeadersExpressionEvaluator;
import org.mule.expression.MessageHeadersListExpressionEvaluator;
import org.mule.expression.transformers.ExpressionArgument;
import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Map;
import static org.mule.expression.ExpressionConstants.OPTIONAL_ARGUMENT;
/**
* Responsible for parsing the {@link org.mule.api.annotations.param.InboundHeaders} annotation. This is an iBeans
* framework class and cannot be used in any other context.
*/
public class InboundHeadersAnnotationParser implements ExpressionAnnotationParser
{
public ExpressionArgument parse(Annotation annotation, Class<?> parameterType)
{
Evaluator evaluator = annotation.annotationType().getAnnotation(Evaluator.class);
if (evaluator != null)
{
String expr = ((InboundHeaders) annotation).value();
boolean optional = false;
String eval = MessageHeaderExpressionEvaluator.NAME;
if (parameterType.isAssignableFrom(Map.class))
{
eval = MessageHeadersExpressionEvaluator.NAME;
}
else if (parameterType.isAssignableFrom(List.class))
{
eval = MessageHeadersListExpressionEvaluator.NAME;
}
else if (expr.endsWith(OPTIONAL_ARGUMENT))
{
//We only set optional if we're dealing with a single header, List and Maps of headers can contain
//optional names but we will always return a Map or List even if it is empty
optional = true;
}
return new ExpressionArgument(null, new ExpressionConfig("INBOUND:" + expr, eval, null), optional, parameterType);
}
else
{
throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
}
}
public boolean supports(Annotation annotation)
{
return annotation instanceof InboundHeaders;
}
}