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/*
 * Milyn - Copyright (C) 2006 - 2010
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License (version 2.1) as published by the Free Software
 *  Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 *  See the GNU Lesser General Public License for more details:
 *  http://www.gnu.org/licenses/lgpl.txt
 */

package org.milyn.javabean.dynamic.ext;

import org.milyn.SmooksException;
import org.milyn.cdr.SmooksConfigurationException;
import org.milyn.cdr.SmooksResourceConfiguration;
import org.milyn.cdr.extension.ExtensionContext;
import org.milyn.container.ExecutionContext;
import org.milyn.delivery.dom.DOMVisitBefore;
import org.milyn.javabean.ext.BeanConfigUtil;
import org.w3c.dom.Element;

public class BeanClassLookup implements DOMVisitBefore {

    public void visitBefore(Element element, ExecutionContext executionContext) throws SmooksException {
        // The current config on the stack must be ...
        ExtensionContext extensionContext = ExtensionContext.getExtensionContext(executionContext);
        SmooksResourceConfiguration dmbWriterConfig = extensionContext.getResourceStack().peek();
        if(dmbWriterConfig.getStringParameter("beanClass") == null) {
            String beanId = dmbWriterConfig.getStringParameter("beanId");

            if(beanId == null) {
                throw new SmooksConfigurationException("One of the 'beanClass' or 'beanId' attributes must be configured on the  configuration.");                
            }

            SmooksResourceConfiguration beanCreatorConfig = BeanConfigUtil.findBeanCreatorConfig(beanId, executionContext);
            if(beanCreatorConfig == null) {
                throw new SmooksConfigurationException("Cannot find  configuration for beanId '" + beanId + "' for .  Reordered  after  config.");
            }

            String beanClass = beanCreatorConfig.getStringParameter(BeanConfigUtil.BEAN_CLASS_CONFIG);
            if(beanClass == null) {
                throw new SmooksConfigurationException("Cannot create find BeanWriter for beanId '" + beanId + "'.  The associated  configuration does not define a bean Class name.");
            }

            dmbWriterConfig.setParameter(BeanConfigUtil.BEAN_CLASS_CONFIG, beanClass);
        }
    }
}