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The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time weaving (LTW) during class-loading and also contains the AspectJ runtime 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 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.List;
import java.util.Map;

import org.aspectj.bridge.IMessage;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.World;

public class DeclarePrecedence extends Declare {
	private TypePatternList patterns;
	private IScope scope = null; // non-null means it has not yet been resolved (used by annotation style lazy resolution)

	public DeclarePrecedence(List patterns) {
		this(new TypePatternList(patterns));
	}

	private DeclarePrecedence(TypePatternList patterns) {
		this.patterns = patterns;
	}

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

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

	public Declare parameterizeWith(Map typeVariableBindingMap, World w) {
		DeclarePrecedence ret = new DeclarePrecedence(this.patterns.parameterizeWith(typeVariableBindingMap, w));
		ret.copyLocationFrom(this);
		return ret;
	}

	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("declare precedence: ");
		buf.append(patterns);
		buf.append(";");
		return buf.toString();
	}

	public boolean equals(Object other) {
		if (!(other instanceof DeclarePrecedence)) {
			return false;
		}
		DeclarePrecedence o = (DeclarePrecedence) other;
		return o.patterns.equals(patterns);
	}

	public int hashCode() {
		return patterns.hashCode();
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeByte(Declare.DOMINATES);
		patterns.write(s);
		writeLocation(s);
	}

	public static Declare read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		Declare ret = new DeclarePrecedence(TypePatternList.read(s, context));
		ret.readLocation(context, s);
		return ret;
	}

	public void setScopeForResolution(IScope scope) {
		this.scope = scope;
	}

	public void ensureResolved() { // Lazy resolution - due to pr256779
		if (scope != null) {
			try {
				resolve(scope);
			} finally {
				scope = null;
			}
		}
	}

	public void resolve(IScope scope) {
		patterns = patterns.resolveBindings(scope, Bindings.NONE, false, false);
		boolean seenStar = false;

		for (int i = 0; i < patterns.size(); i++) {
			TypePattern pi = patterns.get(i);
			if (pi.isStar()) {
				if (seenStar) {
					scope.getWorld().showMessage(IMessage.ERROR, WeaverMessages.format(WeaverMessages.TWO_STARS_IN_PRECEDENCE),
							pi.getSourceLocation(), null);
				}
				seenStar = true;
				continue;
			}
			ResolvedType exactType = pi.getExactType().resolve(scope.getWorld());
			if (exactType.isMissing()) {
				continue;
			}

			// Cannot do a dec prec specifying a non-aspect types unless suffixed with a '+'
			if (!exactType.isAspect() && !exactType.isAnnotationStyleAspect() && !pi.isIncludeSubtypes()
					&& !exactType.isTypeVariableReference()) {
				scope.getWorld().showMessage(IMessage.ERROR,
						WeaverMessages.format(WeaverMessages.CLASSES_IN_PRECEDENCE, exactType.getName()), pi.getSourceLocation(),
						null);
			}

			for (int j = 0; j < patterns.size(); j++) {
				if (j == i) {
					continue;
				}
				TypePattern pj = patterns.get(j);
				if (pj.isStar()) {
					continue;
				}
				if (pj.matchesStatically(exactType)) {
					scope.getWorld().showMessage(IMessage.ERROR,
							WeaverMessages.format(WeaverMessages.TWO_PATTERN_MATCHES_IN_PRECEDENCE, exactType.getName()),
							pi.getSourceLocation(), pj.getSourceLocation());
				}
			}
		}
	}

	public TypePatternList getPatterns() {
		ensureResolved();
		return patterns;
	}

	private int matchingIndex(ResolvedType a) {
		ensureResolved();
		int knownMatch = -1;
		int starMatch = -1;
		for (int i = 0, len = patterns.size(); i < len; i++) {
			TypePattern p = patterns.get(i);
			if (p.isStar()) {
				starMatch = i;
			} else if (p.matchesStatically(a)) {
				if (knownMatch != -1) {
					a.getWorld().showMessage(IMessage.ERROR,
							WeaverMessages.format(WeaverMessages.MULTIPLE_MATCHES_IN_PRECEDENCE, a, patterns.get(knownMatch), p),
							patterns.get(knownMatch).getSourceLocation(), p.getSourceLocation());
					return -1;
				} else {
					knownMatch = i;
				}
			}
		}
		if (knownMatch == -1) {
			return starMatch;
		} else {
			return knownMatch;
		}
	}

	public int compare(ResolvedType aspect1, ResolvedType aspect2) {
		ensureResolved();
		int index1 = matchingIndex(aspect1);
		int index2 = matchingIndex(aspect2);

		// System.out.println("a1: " + aspect1 + ", " + aspect2 + " = " + index1 + ", " + index2);

		if (index1 == -1 || index2 == -1) {
			return 0;
		}

		if (index1 == index2) {
			return 0;
		} else if (index1 > index2) {
			return -1;
		} else {
			return +1;
		}
	}

	public boolean isAdviceLike() {
		return false;
	}

	public String getNameSuffix() {
		return "precedence";
	}
}