/*
 * @(#)$Id: TopLevelState.java,v 1.3 2001/05/01 18:13:25 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.relaxns.reader;

import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.State;
import com.sun.msv.reader.relax.HedgeRuleBaseState;
import com.sun.msv.reader.relax.core.RELAXCoreReader;
import com.sun.msv.util.StartTagInfo;

/**
 * parses <topLevel> element.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class TopLevelState extends HedgeRuleBaseState
{
	protected void endSelf( Expression contentModel ) {
		((RELAXNSReader)reader).grammar.topLevel = contentModel;
	}

	protected State createChildState( StartTagInfo tag )
	{
		// user tends to forget to specify RELAX Core namespace for
		// topLevel elements. see if this is the case
		if( tag.namespaceURI.equals(RELAXNSReader.RELAXNamespaceNamespace))
		{// bingo.
			reader.reportError( RELAXNSReader.ERR_TOPLEVEL_PARTICLE_MUST_BE_RELAX_CORE );
			// return null so that user will also receive "malplaced element" error.
			return null;
		}
		
		return super.createChildState(tag);
	}

	protected boolean isGrammarElement( StartTagInfo tag ) {
		// children of <topLevel> must be RELAXCore.
		if( tag.namespaceURI.equals(RELAXCoreReader.RELAXCoreNamespace) )
			return true;
		
		// for better error message, allow RELAX Namespace elements.
		// this error is handled at createChildState method.
		if( tag.namespaceURI.equals(RELAXNSReader.RELAXNamespaceNamespace) )
			return true;
		
		return false;
	}
}