/*
 * @(#)$Id: RootIncludedPatternState.java,v 1.8 2001/07/26 20:43:22 Bear 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.trex;

import com.sun.msv.util.StartTagInfo;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.trex.TREXGrammar;
import com.sun.msv.reader.State;
import com.sun.msv.reader.SimpleState;
import com.sun.msv.reader.ExpressionOwner;

/**
 * parses the root state of a grammar included as a pattern.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class RootIncludedPatternState extends SimpleState implements ExpressionOwner {

	protected State createChildState( StartTagInfo tag ) {
		// grammar has to be treated separately so as not to
		// create unnecessary TREXGrammar object.
//		if(tag.localName.equals("grammar"))
//			return new GrammarState();
		
		State s = reader.createExpressionChildState(this,tag);
//		if(s!=null) {
//			// other pattern element is specified.
//			// create wrapper grammar
//			final TREXBaseReader reader = (TREXBaseReader)this.reader;
//			reader.grammar = new TREXGrammar( reader.pool, null );
//			simple = true;
//		}
		
		return s;
	}
	
	
	/**
	 * parsed external pattern will be reported to this object.
	 * This state parses top-level, so parentState is null.
	 */
	private final IncludePatternState grandParent;
	
	protected RootIncludedPatternState( IncludePatternState grandpa ) {
		this.grandParent = grandpa;
	}
		
	public void onEndChild(Expression exp) {
		if( grandParent!=null )
			// this must be from grammar element. pass it to the IncludePatternState.
			grandParent.onEndChild(exp);

	}
}