/*
 * @(#)$Id: Token.java,v 1.10 2001/10/19 23:59:21 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.verifier.regexp;

import com.sun.msv.grammar.*;

/**
 * primitive unit of XML instance.
 * 
 * this object is fed to expression.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public abstract class Token
{
	/** returns true if the given ElementExp can consume this token  */
	public boolean match( ElementExp p )		{ return false;	}
	public boolean match( AttributeExp p )		{ return false; }
	/** returns true if the given DataExp can consume this token */
	public boolean match( DataExp p )			{ return false; }
	public boolean match( ValueExp p )			{ return false; }
	/** returns true if the given ListExp can consume this token */
	public boolean match( ListExp p )			{ return false; }
	
	/** returns true if anyString pattern can consume this token */
	public boolean matchAnyString()			{ return false; }

	/** checks if this token is ignorable. */
	boolean isIgnorable() { return false; }
}