AnyState.java

/*
 * @(#)$Id: AnyState.java,v 1.14 2002/08/08 22:55:22 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.xmlschema;

import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.NotNameClass;
import com.sun.msv.grammar.NamespaceNameClass;
import com.sun.msv.grammar.ChoiceNameClass;
import com.sun.msv.grammar.AnyNameClass;
import com.sun.msv.grammar.SimpleNameClass;
import com.sun.msv.grammar.DifferenceNameClass;
import com.sun.msv.grammar.xmlschema.ElementDeclExp;
import com.sun.msv.grammar.xmlschema.LaxDefaultNameClass;
import com.sun.msv.grammar.xmlschema.XMLSchemaSchema;
import com.sun.msv.reader.ExpressionWithoutChildState;
import java.util.StringTokenizer;
import java.util.Iterator;

/**
 * base implementation of AnyAttributeState and AnyElementState.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public abstract class AnyState extends ExpressionWithoutChildState {

	protected final Expression makeExpression() {
		return createExpression(
			startTag.getDefaultedAttribute("namespace","##any"),
			startTag.getDefaultedAttribute("processContents","strict") );
	}
	
	/**
	 * creates AGM that corresponds to the specified parameters.
	 */
	protected abstract Expression createExpression( String namespace, String process );
	
	/**
	 * processes 'namepsace' attribute and gets corresponding NameClass object.
	 */
	protected NameClass getNameClass( String namespace, XMLSchemaSchema currentSchema ) {
		// we have to get currentSchema through parameter because
		// this method is also used while back-patching, and 
		// reader.currentSchema points to the invalid schema in that case.
		final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
		namespace = namespace.trim();
		
		if( namespace.equals("##any") )
			return AnyNameClass.theInstance;
		
		if( namespace.equals("##other") )
            // ##other means anything other than the target namespace and local.
			return new NotNameClass(
                new ChoiceNameClass(
                    new NamespaceNameClass(currentSchema.targetNamespace),
                    new NamespaceNameClass("")) );
		
		NameClass choices=null;
		
		StringTokenizer tokens = new StringTokenizer(namespace);
		while( tokens.hasMoreTokens() ) {
			String token = tokens.nextToken();
			
			NameClass nc;
			if( token.equals("##targetNamespace") )
				nc = new NamespaceNameClass(currentSchema.targetNamespace);
			else
			if( token.equals("##local") )
				nc = new NamespaceNameClass("");
			else
				nc = new NamespaceNameClass(token);
			
			if( choices==null )		choices = nc;
			else					choices = new ChoiceNameClass(choices,nc);
		}
		
		if( choices==null ) {
			// no item was found.
			reader.reportError( reader.ERR_BAD_ATTRIBUTE_VALUE, "namespace", namespace );
			return AnyNameClass.theInstance;
		}
		
		return choices;
	}
	
	protected abstract NameClass getNameClassFrom( ReferenceExp exp );
					
	protected NameClass createLaxNameClass( NameClass allowedNc, XMLSchemaReader.RefResolver res ) {
		final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
		LaxDefaultNameClass laxNc = new LaxDefaultNameClass(allowedNc);
				
		Iterator itr = reader.grammar.iterateSchemas();
		while( itr.hasNext() ) {
			XMLSchemaSchema schema = (XMLSchemaSchema)itr.next();
			if(allowedNc.accepts( schema.targetNamespace, NameClass.LOCALNAME_WILDCARD )) {
				ReferenceExp[] refs = res.get(schema).getAll();
				for( int i=0; i<refs.length; i++ ) {
					NameClass name = getNameClassFrom(refs[i]);
							
					if(!(name instanceof SimpleNameClass ))
						// assertion failed.
						// XML Schema's element declaration is always simple name.
						throw new Error();
					SimpleNameClass snc = (SimpleNameClass)name;
							
					laxNc.addName(snc.namespaceURI,snc.localName);
				}
			}
		}

		// laxNc - names in namespaces that are not allowed.
		return new DifferenceNameClass( laxNc, new NotNameClass(allowedNc) );
	}
}