package org.madore.damlengine;

import java.util.Map;
import java.util.HashMap;
import org.w3c.dom.Element;
import org.w3c.dom.Attr;

public abstract class TodoAttr extends TodoItem {

    public static abstract class Factory {
	public abstract TodoAttr newItem(Attr attr, Element owner,
					 Context ctx,
					 TodoItem caller);
    }

    protected final static Map<String,Factory> damlAttrFactories;

    static {
	damlAttrFactories = new HashMap<String,Factory>();
	damlAttrFactories.put("xempty", new TodoXemptyAttr.Factory());
	damlAttrFactories.put("wref", new TodoWrefAttr.Factory());
	damlAttrFactories.put("wxref", new TodoWXrefAttr.Factory());
    }

    protected final static Factory xmlnsAttrFactory
	= new TodoXmlnsAttr.Factory();

    protected final Attr attr;
    protected final Element owner;

    public TodoAttr(Attr attr, Element owner,
		    Context ctx, TodoItem caller) {
	super(ctx, caller);
	this.attr = attr;
	this.owner = owner;
    }

    public static TodoAttr getTodoAttr(Attr attr, Element owner,
				       Context ctx,
				       TodoItem caller) {
	Factory factory = null;
	String nsuri = attr.getNamespaceURI();
	if ( nsuri != null && nsuri.equals(DamlEngine.DAML_NS) )
	    factory = damlAttrFactories.get(attr.getLocalName());
	else if ( nsuri != null && nsuri.equals(DamlEngine.XMLNS_NS) )
	    // Note to self: even the plain "xmlns" attribute has this namespace
	    factory = xmlnsAttrFactory;
	if ( factory == null )
	    return null;
	return factory.newItem(attr, owner, ctx, caller);
    }

}