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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;

import java.util.ArrayList;
import java.util.List;

public class IntMap {
	// public static final IntMap EMPTY = new IntMap(0) {
	// public boolean directlyInAdvice() { return true; }
	// public ShadowMunger getEnclosingAdvice() { return null; } //XXX possible
	// };

	// XXX begin hack to avoid a signature refactoring in Pointcut
	private ResolvedType concreteAspect;
	private ShadowMunger enclosingAdvice;
	private List enclosingDefinition = new ArrayList<>();

	public void pushEnclosingDefinition(ResolvedPointcutDefinition def) {
		enclosingDefinition.add(def);
	}

	public void popEnclosingDefinitition() {
		enclosingDefinition.remove(enclosingDefinition.size() - 1);
	}

	public ResolvedPointcutDefinition peekEnclosingDefinition() {
		if (enclosingDefinition.size() == 0) {
			return null;
		}
		return enclosingDefinition.get(enclosingDefinition.size() - 1);
	}

	public boolean directlyInAdvice() {
		return enclosingDefinition.isEmpty();
	}

	public ShadowMunger getEnclosingAdvice() {
		return enclosingAdvice;
	}

	public void setEnclosingAdvice(ShadowMunger advice) {
		this.enclosingAdvice = advice;
	}

	public Member getAdviceSignature() {
		if (enclosingAdvice instanceof Advice) {
			return ((Advice) enclosingAdvice).getSignature();
		} else {
			return null;
		}
	}

	public ResolvedType getConcreteAspect() {
		return concreteAspect;
	}

	public void setConcreteAspect(ResolvedType concreteAspect) {
		this.concreteAspect = concreteAspect;
	}

	public void copyContext(IntMap bindings) {
		this.enclosingAdvice = bindings.enclosingAdvice;
		this.enclosingDefinition = bindings.enclosingDefinition;
		this.concreteAspect = bindings.concreteAspect;
	}

	// XXX end hack to avoid a signature refactoring in Pointcut

	private static final int MISSING = -1;

	private int[] map;

	private IntMap(int[] map) {
		this.map = map;
	}

	public IntMap() {
		map = new int[0];
	}

	public IntMap(int initialCapacity) {
		map = new int[initialCapacity];
		for (int i = 0; i < initialCapacity; i++) {
			map[i] = MISSING;
		}
	}

	public void put(int key, int val) {
		/* assert (val >= 0 && key >= 0) */
		if (key >= map.length) {
			int[] tmp = new int[key * 2 + 1]; // ??? better expansion function
			System.arraycopy(map, 0, tmp, 0, map.length);
			for (int i = map.length, len = tmp.length; i < len; i++) {
				tmp[i] = MISSING;
			}
			map = tmp;
		}
		map[key] = val;
	}

	public int get(int key) {
		return map[key];
	}

	public boolean hasKey(int key) {
		return (key < map.length && map[key] != MISSING);
	}

	// ---- factory methods

	public static IntMap idMap(int size) {
		int[] map = new int[size];
		for (int i = 0; i < size; i++) {
			map[i] = i;
		}
		return new IntMap(map);
	}

	// ---- from object

	public String toString() {
		StringBuilder buf = new StringBuilder("[");
		boolean seenFirst = false;
		for (int i = 0, len = map.length; i < len; i++) {
			if (map[i] != MISSING) {
				if (seenFirst) {
					buf.append(", ");
				}
				seenFirst = true;
				buf.append(i);
				buf.append(" -> ");
				buf.append(map[i]);
			}
		}
		buf.append("]");
		return buf.toString();
	}

}