/*
 * @(#)$Id: TagState.java,v 1.2 2001/05/01 18:13:10 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.relax.core;

import org.xml.sax.Locator;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.relax.TagClause;
import com.sun.msv.grammar.SimpleNameClass;

/**
 * parses <tag> element.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class TagState extends ClauseState
{
	protected void endSelf( )
	{
		super.endSelf();
		
		final String name = startTag.getAttribute("name");
		String role = startTag.getAttribute("role");
		if(role==null)	role=name;	// role defaults to name
		
		if(name==null)
		{
			reader.reportError(reader.ERR_MISSING_ATTRIBUTE, "tag","name");
			return;
		}
		
		TagClause c = getReader().module.tags.getOrCreate(role);
		
		if(c.nameClass!=null)
		{
			// someone has already initialized this clause.
			// this happens when more than one tag element declares the same role.
			reader.reportError(
				new Locator[]{getReader().getDeclaredLocationOf(c),location},
				RELAXCoreReader.ERR_MULTIPLE_TAG_DECLARATIONS, new Object[]{role} );
			// recover from error by ignoring previous tag declaration
		}
		
		c.nameClass = new SimpleNameClass(
			getReader().module.targetNamespace,
			name );
		
		c.exp = exp;	// exp holds a sequence of AttributeExp
		getReader().setDeclaredLocationOf(c);	// remember where this tag is declared
		
		return;
	}
}