/*
 * @(#)$Id: UnionState.java,v 1.12 2002/07/25 16:56:35 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.datatype.xsd;

import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.datatype.xsd.DatatypeFactory;
import com.sun.msv.reader.State;
import com.sun.msv.reader.IgnoreState;
import com.sun.msv.reader.datatype.TypeOwner;
import com.sun.msv.util.StartTagInfo;
import java.util.ArrayList;
import java.util.StringTokenizer;
import org.relaxng.datatype.Datatype;
import org.relaxng.datatype.DatatypeException;

/**
 * State that parses <union> element and its children.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class UnionState extends TypeState implements XSTypeOwner {

    protected final String newTypeUri;
    protected final String newTypeName;
    
    protected UnionState( String newTypeUri, String newTypeName ) {
        this.newTypeUri  = newTypeUri;
        this.newTypeName = newTypeName;
    }
	
	private final ArrayList memberTypes = new ArrayList();
												  
	protected State createChildState( StartTagInfo tag ) {
		// accepts elements from the same namespace only.
		if( !startTag.namespaceURI.equals(tag.namespaceURI) )	return null;
		
		if( tag.localName.equals("annotation") )	return new IgnoreState();
		if( tag.localName.equals("simpleType") )	return new SimpleTypeState();
		
		return null;	// unrecognized
	}
	
	protected void startSelf() {
		super.startSelf();
		
		// if memberTypes attribute is used, load it.
		String memberTypes = startTag.getAttribute("memberTypes");
		if(memberTypes!=null) {
			StringTokenizer tokens = new StringTokenizer(memberTypes);
			while( tokens.hasMoreTokens() )
	            onEndChild( ((XSDatatypeResolver)reader)
                    .resolveXSDatatype(tokens.nextToken()) );
		}
	}
	
	public void onEndChild( XSDatatypeExp type ) {
		memberTypes.add(type);
	}
    
	
	protected final XSDatatypeExp makeType() throws DatatypeException {
        return XSDatatypeExp.makeUnion( newTypeUri, newTypeName, memberTypes, reader );
	}

}