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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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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 v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     PARC     initial implementation
 * ******************************************************************/


package org.aspectj.weaver.patterns;

import java.util.HashMap;
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 (Map.Entry entry : questionsAndAnswers.entrySet()) {
			Question question = entry.getKey();
			FuzzyBoolean expectedAnswer = entry.getValue();

			FuzzyBoolean currentAnswer = question.ask();
			//System.out.println(question + ":" + currentAnswer);
			if (currentAnswer != expectedAnswer) {
				return question;
			}
		}

		return null;
	}

	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("TypePatternQuestions{");
		for (Map.Entry entry: questionsAndAnswers.entrySet()) {
			Question question = entry.getKey();
			FuzzyBoolean expectedAnswer = 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 + ")";
		}
	}
}