/*
 * @(#)$Id: ElementRuleWithTypeState.java,v 1.10 2002/06/24 19:57:59 kk122374 Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.reader.relax.core;

import org.relaxng.datatype.DatatypeException;
import com.sun.msv.reader.State;
import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.datatype.xsd.FacetStateParent;
import com.sun.msv.reader.datatype.xsd.XSDatatypeExp;
import com.sun.msv.reader.datatype.xsd.XSTypeIncubator;
import com.sun.msv.util.StartTagInfo;

/**
 * parses <elementRule> with 'type' attribute.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class ElementRuleWithTypeState extends ElementRuleBaseState implements FacetStateParent
{
	protected XSTypeIncubator incubator;
	
	public XSTypeIncubator getIncubator()	{ return incubator; }
	
	protected void startSelf() {
		super.startSelf();

        final RELAXCoreReader reader = (RELAXCoreReader)this.reader;
        
		// existance of type attribute has already checked before
		// this state is created.
		incubator = reader.resolveXSDatatype(startTag.getAttribute("type"))
            .createIncubator();
	}
	
	protected Expression getContentModel() {
		try {
			return incubator.derive(null,null);
		} catch( DatatypeException e ) {
			// derivation failed
			reader.reportError( e, reader.ERR_BAD_TYPE, e.getMessage() );
			// recover by using harmless expression. anything will do.
			return Expression.anyString;
		}
	}
	
	protected State createChildState( StartTagInfo tag ) {
		State next = getReader().createFacetState(this,tag);
		if(next!=null)		return next;			// facets
		
		return super.createChildState(tag);			// or delegate to the base class
	}
}