DivInGrammarState.java example

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/*
 * @(#)$Id: DivInGrammarState.java,v 1.1 2001/06/07 15:53:05 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.trex;

import com.sun.msv.util.StartTagInfo;
import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.*;

/**
 * Used to parse merged grammars. Also <div> element in the grammar element
 * (of RELAX NG).
 * 
 * DivInGrammarState itself should not be a ExpressionState. However, GrammarState,
 * which is a derived class of this class, is a ExpressionState.
 * 
 * Therefore this class has to extend ExpressionState.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class DivInGrammarState extends ExpressionState implements ExpressionOwner {
	
	protected final TREXBaseReader getReader() { return (TREXBaseReader)reader; }
	
	protected Expression makeExpression() {
		// this method doesn't provide any pattern
		return null;
	}

	protected State createChildState( StartTagInfo tag ) {
		if(tag.localName.equals("start"))	return getReader().sfactory.start(this,tag);
		if(tag.localName.equals("define"))	return getReader().sfactory.define(this,tag);
		if(tag.localName.equals("include"))	return getReader().sfactory.includeGrammar(this,tag);
		// div is available only for RELAX NG.
		// The default implementation of divInGrammar returns null.
		if(tag.localName.equals("div"))		return getReader().sfactory.divInGrammar(this,tag);
		return null;
	}
	
	// DefineState and StartState is implemented by using ExpressionState.
	// By contract of that interface, this object has to implement ExpressionOwner.
	public void onEndChild( Expression exp ) {}	// do nothing.
}