/*
 * @(#)$Id: HedgeRules.java,v 1.5 2001/05/16 21:33:17 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.grammar.relax;

import com.sun.msv.grammar.*;

/**
 * hedgeRule of RELAX module.
 * 
 * ReferenceExp.exp holds a choice of the content models of all hedgeRules that
 * share the same label name.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class HedgeRules extends ReferenceExp implements Exportable {
	
	protected HedgeRules( String label, RELAXModule ownerModule ) {
		super(label);
		this.ownerModule = ownerModule;
	}
	
	public void addHedge( Expression exp, ExpressionPool pool ) {
		if( this.exp==null )		this.exp=exp;	// first time
		else						this.exp=pool.createChoice(this.exp,exp);
	}
	
	public boolean equals( Object o )	{ return this==o; }

	public Object visit( RELAXExpressionVisitor visitor )
	{ return visitor.onHedgeRules(this); }

	public Expression visit( RELAXExpressionVisitorExpression visitor )
	{ return visitor.onHedgeRules(this); }
	
	public boolean visit( RELAXExpressionVisitorBoolean visitor )
	{ return visitor.onHedgeRules(this); }

	public void visit( RELAXExpressionVisitorVoid visitor )
	{ visitor.onHedgeRules(this); }

	/** a flag that indicates this hedgeRule is exported and
	 * therefore accessible from other modules.
	 */
	public boolean exported = false;
	public boolean isExported() { return exported; }
	
	/** RELAXModule object to which this object belongs */
	public final RELAXModule ownerModule;

}