package org.greenstone.gsdl3.gs3build.metadata;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

public class NamespaceFactory
{
    public static METSNamespace initNamespace()
    {	
	return new GSDL3Namespace();
    }
    
    public static METSNamespace initNamespace(String name)
    {	
	if (name.equals(GSDL3Namespace.GSDL3_NAMESPACE_ID)) {
	    return new GSDL3Namespace();
	}
	return new SimpleNamespace(name);
    }
    
    public static METSNamespace initNamespace(String name, METSLocation location)
    {	
	if (name.equals(GSDL3Namespace.GSDL3_NAMESPACE_ID)){
	    return new GSDL3Namespace(location);
	}
	return new SimpleNamespace(name, location);
    }
    
    /**
     *  TODO: parse the document in based upon its namespace
     */
    public static METSNamespace initNamespace(String name, Element element)
    {	
	//return null;
	return new SimpleNamespace(name);
    }
    
    public static METSNamespace parseXML(Element element)
    {
	METSNamespace namespace = null;
	
	//String mdType = element.getAttribute("MDType");
	//String mdType =element.getAttribute("MDTYPE");

	String othermdType = element.getAttribute("OTHERMDTYPE");
	String mimeType = element.getAttribute("mimeType");
	
	if (element.getNodeName().equals("mets:mdWrap")) {
	    namespace = initNamespace(othermdType, element);
	}
	else if (element.getNodeName().equals("mets:mdRef")) {
	    String mdType = element.getAttribute("MDType");
	    // just a file wrapper on the metadata...
	    String location = element.getAttribute("xlink:href");
	    String locationType = element.getAttribute("LOCTYPE");
	    
	    try {
		METSLocation metsLocation = new METSLocation(locationType, location);
		namespace = initNamespace(mdType, metsLocation);
	    }
	    catch (java.net.MalformedURLException ex) {
		// TODO: Error, should never happen in the case of Greenstone-exported XML
	    }
	}
	return namespace;
    }
}