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/*
 * 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.spring.factories;

import org.mule.api.MuleEvent;
import org.mule.api.MuleException;
import org.mule.api.routing.AggregationContext;
import org.mule.config.spring.parsers.generic.ChildDefinitionParser;
import org.mule.config.spring.parsers.processors.CheckExclusiveAttribute;
import org.mule.routing.AggregationStrategy;

import org.w3c.dom.Element;

public class AggregationStrategyDefinitionParser extends ChildDefinitionParser
{

    public AggregationStrategyDefinitionParser()
    {
        super("aggregationStrategy", null, AggregationStrategy.class);
        this.setAllowClassAttribute(true);
        this.registerPreProcessor(new CheckExclusiveAttribute(ATTRIBUTE_CLASS));
        this.registerPreProcessor(new CheckExclusiveAttribute(ATTRIBUTE_REF));
    }

    @Override
    protected Class getBeanClass(Element element)
    {
        Class clazz = super.getBeanClass(element);
        if (clazz != null)
        {
            return clazz;
        }
        else
        {
            if (element.hasAttribute(ATTRIBUTE_REF))
            {
                return AggregationStrategyDelegate.class;
            }
            else
            {
                throw new IllegalStateException(
                    " requires you to provide a value for either 'class' or 'ref' attributes");
            }
        }
    }

    public static class AggregationStrategyDelegate implements AggregationStrategy
    {

        private AggregationStrategy ref;

        @Override
        public MuleEvent aggregate(AggregationContext context) throws MuleException
        {
            return this.ref.aggregate(context);
        }

        public void setRef(AggregationStrategy ref)
        {
            this.ref = ref;
        }
    }

}