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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) 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.io.IOException;
import java.util.Map;

import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.Advice;
import org.aspectj.weaver.AjcMemberMaker;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.PerObjectInterfaceTypeMunger;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.ResolvedTypeMunger;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.Expr;
import org.aspectj.weaver.ast.Test;
import org.aspectj.weaver.ast.Var;

public class PerObject extends PerClause {
	private final boolean isThis;
	private final Pointcut entry;

	private static final int thisKindSet;
	private static final int targetKindSet;

	static {
		int thisFlags = Shadow.ALL_SHADOW_KINDS_BITS;
		int targFlags = Shadow.ALL_SHADOW_KINDS_BITS;
		for (int i = 0; i < Shadow.SHADOW_KINDS.length; i++) {
			Shadow.Kind kind = Shadow.SHADOW_KINDS[i];
			if (kind.neverHasThis()) {
				thisFlags -= kind.bit;
			}
			if (kind.neverHasTarget()) {
				targFlags -= kind.bit;
			}
		}
		thisKindSet = thisFlags;
		targetKindSet = targFlags;
	}

	public PerObject(Pointcut entry, boolean isThis) {
		this.entry = entry;
		this.isThis = isThis;
	}

	public Object accept(PatternNodeVisitor visitor, Object data) {
		return visitor.visit(this, data);
	}

	@Override
	public Object traverse(PatternNodeVisitor visitor, Object data) {
		Object ret = accept(visitor, data);
		if (this.entry != null)
			this.entry.traverse(visitor, ret);
		return ret;
	}

	public int couldMatchKinds() {
		return isThis ? thisKindSet : targetKindSet;
	}

	// -----
	public FuzzyBoolean fastMatch(FastMatchInfo type) {
		return FuzzyBoolean.MAYBE;
	}

	protected FuzzyBoolean matchInternal(Shadow shadow) {
		// System.err.println("matches " + this + " ? " + shadow + ", " +
		// shadow.hasTarget());
		// ??? could probably optimize this better by testing could match
		if (isThis) {
			return FuzzyBoolean.fromBoolean(shadow.hasThis());
		} else {
			return FuzzyBoolean.fromBoolean(shadow.hasTarget());
		}
	}

	public void resolveBindings(IScope scope, Bindings bindings) {
		// assert bindings == null;
		entry.resolve(scope);
	}

	public Pointcut parameterizeWith(Map typeVariableMap, World w) {
		PerObject ret = new PerObject(entry.parameterizeWith(typeVariableMap, w), isThis);
		ret.copyLocationFrom(this);
		return ret;
	}

	private Var getVar(Shadow shadow) {
		return isThis ? shadow.getThisVar() : shadow.getTargetVar();
	}

	protected Test findResidueInternal(Shadow shadow, ExposedState state) {
		Expr myInstance = Expr.makeCallExpr(AjcMemberMaker.perObjectAspectOfMethod(inAspect), new Expr[] { getVar(shadow) },
				inAspect);
		state.setAspectInstance(myInstance);
		return Test.makeCall(AjcMemberMaker.perObjectHasAspectMethod(inAspect), new Expr[] { getVar(shadow) });
	}

	public PerClause concretize(ResolvedType inAspect) {
		PerObject ret = new PerObject(entry, isThis);

		ret.inAspect = inAspect;
		if (inAspect.isAbstract()) {
			return ret;
		}

		World world = inAspect.getWorld();

		Pointcut concreteEntry = entry.concretize(inAspect, inAspect, 0, null);
		// concreteEntry = new AndPointcut(this, concreteEntry);
		// concreteEntry.state = Pointcut.CONCRETE;
		inAspect.crosscuttingMembers.addConcreteShadowMunger(Advice.makePerObjectEntry(world, concreteEntry, isThis, inAspect));

		// FIXME AV - don't use lateMunger here due to test
		// "inheritance, around advice and abstract pointcuts"
		// see #75442 thread. Issue with weaving order.
		ResolvedTypeMunger munger = new PerObjectInterfaceTypeMunger(inAspect, concreteEntry);
		inAspect.crosscuttingMembers.addLateTypeMunger(world.getWeavingSupport().concreteTypeMunger(munger, inAspect));

		// ATAJ: add a munger to add the aspectOf(..) to the @AJ aspects
		if (inAspect.isAnnotationStyleAspect() && !inAspect.isAbstract()) {
			inAspect.crosscuttingMembers.addLateTypeMunger(inAspect.getWorld().getWeavingSupport().makePerClauseAspect(inAspect,
					getKind()));
		}

		// ATAJ inline around advice support - don't use a late munger to allow
		// around inling for itself
		if (inAspect.isAnnotationStyleAspect() && !inAspect.getWorld().isXnoInline()) {
			inAspect.crosscuttingMembers.addTypeMunger(world.getWeavingSupport().createAccessForInlineMunger(inAspect));
		}

		return ret;
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		PEROBJECT.write(s);
		entry.write(s);
		s.writeBoolean(isThis);
		writeLocation(s);
	}

	public static PerClause readPerClause(VersionedDataInputStream s, ISourceContext context) throws IOException {
		PerClause ret = new PerObject(Pointcut.read(s, context), s.readBoolean());
		ret.readLocation(context, s);
		return ret;
	}

	public PerClause.Kind getKind() {
		return PEROBJECT;
	}

	public boolean isThis() {
		return isThis;
	}

	public String toString() {
		return "per" + (isThis ? "this" : "target") + "(" + entry + ")";
	}

	public String toDeclarationString() {
		return toString();
	}

	public Pointcut getEntry() {
		return entry;
	}

	public boolean equals(Object other) {
		if (!(other instanceof PerObject)) {
			return false;
		}
		PerObject pc = (PerObject) other;
		return (pc.isThis && isThis) && ((pc.inAspect == null) ? (inAspect == null) : pc.inAspect.equals(inAspect))
				&& ((pc.entry == null) ? (entry == null) : pc.entry.equals(entry));
	}

	public int hashCode() {
		int result = 17;
		result = 37 * result + (isThis ? 0 : 1);
		result = 37 * result + ((inAspect == null) ? 0 : inAspect.hashCode());
		result = 37 * result + ((entry == null) ? 0 : entry.hashCode());
		return result;
	}
}