/*
 * @(#)$Id: SimpleTypeState.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.XSDatatypeImpl;
import com.sun.msv.datatype.xsd.FinalComponent;
import com.sun.msv.reader.State;
import com.sun.msv.reader.IgnoreState;
import com.sun.msv.reader.ExpressionState;
import com.sun.msv.util.StartTagInfo;
import org.relaxng.datatype.DatatypeException;
import java.util.StringTokenizer;

/**
 * State that parses <simpleType> element and its children.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class SimpleTypeState extends TypeWithOneChildState
{
	protected State createChildState( StartTagInfo tag ) {
		
		// accepts elements from the same namespace only.
		if( !startTag.namespaceURI.equals(tag.namespaceURI) )	return null;
		
		final String name = startTag.getAttribute("name");
		String uri = getTargetNamespaceUri();
        
		if( tag.localName.equals("annotation") )	return new IgnoreState();
		if( tag.localName.equals("restriction") )	return new RestrictionState(uri,name);
		if( tag.localName.equals("list") )			return new ListState(uri,name);
		if( tag.localName.equals("union") )		return new UnionState(uri,name);
		
		return null;	// unrecognized
	}

	protected XSDatatypeExp annealType( final XSDatatypeExp dt ) {
		final String finalValueStr = startTag.getAttribute("final");
		if(finalValueStr!=null) {
			final int finalValue = getFinalValue(finalValueStr);
			
			// create a new type by adding final constraint.
            return dt.createFinalizedType(finalValue,reader);
		} else
			return dt;
	}


	/** parses final attribute */
	public int getFinalValue( String list ) {
		int finalValue = 0;
		StringTokenizer tokens = new StringTokenizer(list);
		while(tokens.hasMoreTokens()) {
			String token = tokens.nextToken();
			
			if( token.equals("#all") )
				finalValue |=	XSDatatype.DERIVATION_BY_LIST|
								XSDatatype.DERIVATION_BY_RESTRICTION|
								XSDatatype.DERIVATION_BY_UNION;
			else
			if( token.equals("restriction") )
				finalValue |= XSDatatype.DERIVATION_BY_RESTRICTION;
			else
			if( token.equals("list") )
				finalValue |= XSDatatype.DERIVATION_BY_LIST;
			else
			if( token.equals("union") )
				finalValue |= XSDatatype.DERIVATION_BY_UNION;
			else {
				reader.reportError( 
					reader.ERR_ILLEGAL_FINAL_VALUE, token );
				return 0;	// abort
			}
		}
		return finalValue;
	}


}