/*
 * @(#)$Id: TypeState.java,v 1.15 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 org.xml.sax.Attributes;
import org.xml.sax.helpers.AttributesImpl;
import org.relaxng.datatype.DatatypeException;
import com.sun.msv.reader.State;
import com.sun.msv.reader.SimpleState;
import com.sun.msv.reader.IgnoreState;
import com.sun.msv.reader.ExpressionOwner;
import com.sun.msv.reader.GrammarReader;
import com.sun.msv.reader.datatype.TypeOwner;
import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.datatype.xsd.StringType;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.util.StartTagInfo;

/**
 * Base implementation for those states which produce a type object
 * as its parsing result.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
abstract class TypeState extends SimpleState
{
    /** Gets the parent state as TypeOwner. */
    private XSTypeOwner getParent() {
        if( parentState instanceof XSTypeOwner )
            return (XSTypeOwner)parentState;
        else
            return null;    // parent is allowed not to implement this interface
    }

    public final String getTargetNamespaceUri() {
        XSTypeOwner parent = getParent();
        if(parent!=null)    
            return getParent().getTargetNamespaceUri();
        else
            return ""; // we don't have the notion of the namespace URI in this context
    }
    
	public void endSelf() {
		super.endSelf();
		
		XSDatatypeExp type = _makeType();
		
        if( parentState instanceof XSTypeOwner ) {
            ((XSTypeOwner)parentState).onEndChild(type);
            return;
        }
		if( parentState instanceof TypeOwner ) {
			// if the parent can understand what we are creating,
			// then pass the result.
			((TypeOwner)parentState).onEndChildType(type,type.name);
			return;
		}
		if( parentState instanceof ExpressionOwner ) {
            ((ExpressionOwner)parentState).onEndChild(type);
			return;
		}
		
		// we have no option to let the parent state know our result.
		throw new Error(parentState.getClass().getName()+" doesn't implement any of TypeOwner");
	}
	
	/** the makeType method with protection against possible exception. */
	XSDatatypeExp _makeType() {
		try {
			return makeType();
		} catch( DatatypeException be ) {
			reader.reportError( be, reader.ERR_BAD_TYPE );
            // recover by assuming a valid type.
			return new XSDatatypeExp(StringType.theInstance,reader.pool);
		}
	}
		
	/**
	 * This method is called from endElement method.
	 * Implementation has to provide DataType object that represents the content of
	 * this element.
	 */
	protected abstract XSDatatypeExp makeType() throws DatatypeException;


	public final void startElement( String namespaceURI, String localName, String qName, Attributes atts )
	{// within the island of XSD, foreign namespaces are prohibited.
		final StartTagInfo tag = new StartTagInfo(
			namespaceURI,localName,qName,new AttributesImpl(atts),null);
		// we have to copy Attributes, otherwise it will be mutated by SAX parser
			
		State nextState = createChildState(tag);
		if(nextState!=null) {
			reader.pushState(nextState,this,tag);
			return;
		}
				
		// unacceptable element
		reader.reportError(reader.ERR_MALPLACED_ELEMENT, tag.qName );
		// try to recover from error by just ignoring it.
		// element of a foreign namespace. skip subtree
		reader.pushState(new IgnoreState(),this,tag);
	}
}