/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.web.config;

import java.util.Iterator;

import org.springframework.extensions.config.ConfigElement;
import org.springframework.extensions.config.ConfigException;
import org.springframework.extensions.config.xml.elementreader.ConfigElementReader;
import org.dom4j.Element;

/**
 * @author Kevin Roast
 */
public class CommandServletElementReader implements ConfigElementReader
{
   public static final String ELEMENT_COMMANDPROCESSOR = "command-processor";
   public static final String ATTRIBUTE_NAME = "name";
   public static final String ATTRIBUTE_CLASS = "class";
   
   /**
    * @see org.springframework.extensions.config.xml.elementreader.ConfigElementReader#parse(org.dom4j.Element)
    */
   @SuppressWarnings("unchecked")
   public ConfigElement parse(Element element)
   {
      CommandServletConfigElement configElement = new CommandServletConfigElement();
      
      if (element != null)
      {
         if (CommandServletConfigElement.CONFIG_ELEMENT_ID.equals(element.getName()) == false)
         {
            throw new ConfigException("CommandServletElementReader can only parse config elements of type 'command-servlet'");
         }
         
         Iterator<Element> itr = element.elementIterator(ELEMENT_COMMANDPROCESSOR);
         while (itr.hasNext())
         {
            Element procElement = itr.next();
            
            String name = procElement.attributeValue(ATTRIBUTE_NAME);
            String className = procElement.attributeValue(ATTRIBUTE_CLASS);
            
            if (name == null || name.length() == 0)
            {
               throw new ConfigException("'name' attribute is mandatory for command processor config element.");
            }
            if (className == null || className.length() == 0)
            {
               throw new ConfigException("'class' attribute is mandatory for command processor config element.");
            }
            
            configElement.addCommandProcessor(name, className);
         }
      }
      
      return configElement;
   }
}