Package org.richfaces.dtd.wutka

Source Code of org.richfaces.dtd.wutka.WutkaDefinitionFactory

/**
* License Agreement.
*
*  JBoss RichFaces 3.0 - Ajax4jsf Component Library
*
* Copyright (C) 2007  Exadel, Inc.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
*/

package org.richfaces.dtd.wutka;

import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.richfaces.dtd.Attribute;
import org.richfaces.dtd.DocumentDefinition;
import org.richfaces.dtd.DocumentDefinitionFactory;
import org.richfaces.dtd.Element;

import com.wutka.dtd.DTD;
import com.wutka.dtd.DTDAttribute;
import com.wutka.dtd.DTDElement;
import com.wutka.dtd.DTDParser;

/**
* @author Maksim Kaszynski
*
*/
public class WutkaDefinitionFactory extends DocumentDefinitionFactory{
 
  private final Log log = LogFactory.getLog(this.getClass());
 
  private Map<URL, DocumentDefinition> definitions
    = new HashMap<URL, DocumentDefinition>();
 
  @Override
  public synchronized DocumentDefinition getDocumentDefinition(URL resource) {
    DocumentDefinition def = null;
    if (definitions.containsKey(resource)) {
      def = definitions.get(resource);
    } else {
     
      try {
        def = initDefinition(resource);
      } catch(Exception e) {
        log.error("An error has occured", e);
      }
     
      if (def != null) {
        definitions.put(resource, def);
      }
    }
    return def;
  }
 
 
  private DocumentDefinition initDefinition(URL resource) throws Exception{

    DTD dtd = new DTDParser(resource).parse();
   
    Element rootElement = fromWutka(dtd.rootElement);
   
    DocumentDefinition definition = new DocumentDefinition(resource, rootElement);
   
    @SuppressWarnings("unchecked")
    Enumeration<DTDElement> elements = dtd.elements.elements();
   
    while(elements.hasMoreElements()) {
      DTDElement element = elements.nextElement();
     
      definition.addElement(fromWutka(element));
    }
   
    return definition;
  }
 
  private Attribute fromWutka(DTDAttribute attr) {
    return new Attribute(attr.name);
  }
 
  private Element fromWutka(DTDElement element) {
   
    if (element == null) {
      return null;
    }
   
    Element e = new Element(element.getName());

    @SuppressWarnings("unchecked")
    Enumeration<DTDAttribute> attrs =
      element.attributes.elements();
   
    while(attrs.hasMoreElements()) {
      e.addAttribute(fromWutka(attrs.nextElement()));
    }
 
    return e;
  }
}
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