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The AspectJ weaver introduces advices to java classes

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/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     PARC     initial implementation 
 * ******************************************************************/


package org.aspectj.weaver.patterns;

import org.aspectj.weaver.IHasPosition;

public interface IToken extends IHasPosition {
	public static final IToken EOF = BasicToken.makeOperator("", 0, 0);
	
	/**
	 * Returns the string value of this token.
	 * 
	 * If isIdentifier is false, then this string must be intern'd
	 * so that == matching can be used.
	 * 
	 * If isIdentifier is true, interning is not required.
	 */
    public String getString();
    
    /**
     * Whether this should be treated as a token or a generic identifier
     */
    public boolean isIdentifier();
    
    /**
     * Whether this should be treated as a literal value
     * 
     * Kinds == "string", ???
     * 
     * returns null if this isn't a literal
     */
    public String getLiteralKind();
    
    
    /**
     * If this token represents a pre-parsed Pointcut, then return it;
     * otherwise returns null.
     * 
     * Needed for the implementation of 'if'
     */
    public Pointcut maybeGetParsedPointcut();
}