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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 java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.ResolvedType;


public class TypePatternQuestions {
	private Map questionsAndAnswers = new HashMap();
	
	public FuzzyBoolean askQuestion(TypePattern pattern, ResolvedType type,
									TypePattern.MatchKind kind)
	{
		Question question = new Question(pattern, type, kind);
		//??? should we use this table to do caching or is that a pessimization
		//??? if we do that optimization we can also do error checking that the result
		//??? doesn't change
		FuzzyBoolean answer = question.ask();
		questionsAndAnswers.put(question, answer);
		return answer;
	}
	
	public Question anyChanges() {
		for (Iterator> i = questionsAndAnswers.entrySet().iterator(); i.hasNext(); ) {
			Map.Entry entry = i.next();
			Question question = (Question)entry.getKey();
			FuzzyBoolean expectedAnswer = (FuzzyBoolean)entry.getValue();
			
			FuzzyBoolean currentAnswer = question.ask();
			//System.out.println(question + ":" + currentAnswer);
			if (currentAnswer != expectedAnswer) {
				return question;
			}
		}
		
		return null;
	}
	
	public String toString() {
		StringBuffer buf = new StringBuffer();
		buf.append("TypePatternQuestions{");
		for (Map.Entry entry: questionsAndAnswers.entrySet()) {
			Question question = (Question)entry.getKey();
			FuzzyBoolean expectedAnswer = (FuzzyBoolean)entry.getValue();
			buf.append(question);
			buf.append(":");
			buf.append(expectedAnswer);
			buf.append(", ");
		}
		buf.append("}");
		return buf.toString();
	}
	
	
	public class Question {
		TypePattern pattern;
		ResolvedType type;
		TypePattern.MatchKind kind;
	
		public Question(TypePattern pattern, ResolvedType type,
									TypePattern.MatchKind kind) {
			super();
			this.pattern = pattern;
			this.type = type;
			this.kind = kind;
		}
		
		public FuzzyBoolean ask() {
			return pattern.matches(type, kind);
		}
		
		public boolean equals(Object other) {
			if (!(other instanceof Question)) return false;
			Question o = (Question)other;
			return o.pattern.equals(pattern) && o.type.equals(type) && o.kind == kind;
		}
	
		public int hashCode() {
	        int result = 17;
	        result = 37*result + kind.hashCode();
	        result = 37*result + pattern.hashCode();
	        result = 37*result + type.hashCode();
	        return result;
	    }	
	
		public String toString() {
			return "?(" + pattern + ", " + type + ", " + kind + ")";
		}
	}
}