org.aspectj.weaver.reflect.StandardShadowMatchImpl Maven / Gradle / Ivy

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The AspectJ matcher can be used for matching pointcuts independently of any AspectJ compilation or weaving steps. Most notably, this can be used by frameworks such as Spring AOP which utilise the @AspectJ pointcut syntax but implement aspect weaving in a way independent of AspectJ, e.g. using dynamic proxies.
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/* *******************************************************************
 * Copyright (c) 2005 Contributors.
 * 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:
 *   Adrian Colyer			Initial implementation
 * ******************************************************************/
package org.aspectj.weaver.reflect;

import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.And;
import org.aspectj.weaver.ast.Call;
import org.aspectj.weaver.ast.FieldGetCall;
import org.aspectj.weaver.ast.HasAnnotation;
import org.aspectj.weaver.ast.ITestVisitor;
import org.aspectj.weaver.ast.Instanceof;
import org.aspectj.weaver.ast.Literal;
import org.aspectj.weaver.ast.Not;
import org.aspectj.weaver.ast.Or;
import org.aspectj.weaver.ast.Test;
import org.aspectj.weaver.internal.tools.MatchingContextBasedTest;
import org.aspectj.weaver.patterns.ExposedState;
import org.aspectj.weaver.tools.DefaultMatchingContext;
import org.aspectj.weaver.tools.JoinPointMatch;
import org.aspectj.weaver.tools.MatchingContext;
import org.aspectj.weaver.tools.PointcutParameter;
import org.aspectj.weaver.tools.ShadowMatch;

/**
 * @author colyer Implementation of ShadowMatch for reflection based worlds.
 */
public class StandardShadowMatchImpl implements ShadowMatch {

	private FuzzyBoolean match;
	private ExposedState state;
	private Test residualTest;
	private PointcutParameter[] params;
	private ResolvedMember withinCode;
	private ResolvedMember subject;
	private ResolvedType withinType;
	private MatchingContext matchContext = new DefaultMatchingContext();

	public StandardShadowMatchImpl(FuzzyBoolean match, Test test, ExposedState state, PointcutParameter[] params) {
		this.match = match;
		this.residualTest = test;
		this.state = state;
		this.params = params;
	}

	public void setWithinCode(ResolvedMember aMember) {
		this.withinCode = aMember;
	}

	public void setSubject(ResolvedMember aMember) {
		this.subject = aMember;
	}

	public void setWithinType(ResolvedType aClass) {
		this.withinType = aClass;
	}

	public boolean alwaysMatches() {
		return match.alwaysTrue();
	}

	public boolean maybeMatches() {
		return match.maybeTrue();
	}

	public boolean neverMatches() {
		return match.alwaysFalse();
	}

	public JoinPointMatch matchesJoinPoint(Object thisObject, Object targetObject, Object[] args) {
		if (neverMatches())
			return JoinPointMatchImpl.NO_MATCH;
		if (new RuntimeTestEvaluator(residualTest, thisObject, targetObject, args, this.matchContext).matches()) {
			return new JoinPointMatchImpl(getPointcutParameters(thisObject, targetObject, args));
		} else {
			return JoinPointMatchImpl.NO_MATCH;
		}
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.aspectj.weaver.tools.ShadowMatch#setMatchingContext(org.aspectj.weaver.tools.MatchingContext)
	 */
	public void setMatchingContext(MatchingContext aMatchContext) {
		this.matchContext = aMatchContext;
	}

	private PointcutParameter[] getPointcutParameters(Object thisObject, Object targetObject, Object[] args) {
		// Var[] vars = state.vars;
		// PointcutParameterImpl[] bindings = new PointcutParameterImpl[params.length];
		// for (int i = 0; i < bindings.length; i++) {
		// bindings[i] = new PointcutParameterImpl(params[i].getName(), params[i].getType());
		// bindings[i].setBinding(((ReflectionVar) vars[i]).getBindingAtJoinPoint(thisObject, targetObject, args, subject,
		// withinCode, withinType));
		// }
		// return bindings;
		return null;
	}

	private static class RuntimeTestEvaluator implements ITestVisitor {

		private boolean matches = true;
		private final Test test;
		private final Object thisObject;
		private final Object targetObject;
		private final Object[] args;
		private final MatchingContext matchContext;

		public RuntimeTestEvaluator(Test aTest, Object thisObject, Object targetObject, Object[] args, MatchingContext context) {
			this.test = aTest;
			this.thisObject = thisObject;
			this.targetObject = targetObject;
			this.args = args;
			this.matchContext = context;
		}

		public boolean matches() {
			test.accept(this);
			return matches;
		}

		public void visit(And e) {
			boolean leftMatches = new RuntimeTestEvaluator(e.getLeft(), thisObject, targetObject, args, matchContext).matches();
			if (!leftMatches) {
				matches = false;
			} else {
				matches = new RuntimeTestEvaluator(e.getRight(), thisObject, targetObject, args, matchContext).matches();
			}
		}

		public void visit(Instanceof i) {
			ReflectionVar v = (ReflectionVar) i.getVar();
			Object value = v.getBindingAtJoinPoint(thisObject, targetObject, args);
			World world = v.getType().getWorld();
			ResolvedType desiredType = i.getType().resolve(world);
			ResolvedType actualType = world.resolve(value.getClass().getName());
			matches = desiredType.isAssignableFrom(actualType);
		}

		public void visit(MatchingContextBasedTest matchingContextTest) {
			matches = matchingContextTest.matches(this.matchContext);
		}

		public void visit(Not not) {
			matches = !new RuntimeTestEvaluator(not.getBody(), thisObject, targetObject, args, matchContext).matches();
		}

		public void visit(Or or) {
			boolean leftMatches = new RuntimeTestEvaluator(or.getLeft(), thisObject, targetObject, args, matchContext).matches();
			if (leftMatches) {
				matches = true;
			} else {
				matches = new RuntimeTestEvaluator(or.getRight(), thisObject, targetObject, args, matchContext).matches();
			}
		}

		public void visit(Literal literal) {
			if (literal == Literal.FALSE) {
				matches = false;
			} else {
				matches = true;
			}
		}

		public void visit(Call call) {
			throw new UnsupportedOperationException("Can't evaluate call test at runtime");
		}

		public void visit(FieldGetCall fieldGetCall) {
			throw new UnsupportedOperationException("Can't evaluate fieldGetCall test at runtime");
		}

		public void visit(HasAnnotation hasAnnotation) {
			ReflectionVar v = (ReflectionVar) hasAnnotation.getVar();
			Object value = v.getBindingAtJoinPoint(thisObject, targetObject, args);
			World world = v.getType().getWorld();
			ResolvedType actualVarType = world.resolve(value.getClass().getName());
			ResolvedType requiredAnnotationType = hasAnnotation.getAnnotationType().resolve(world);
			matches = actualVarType.hasAnnotation(requiredAnnotationType);
		}

	}

}