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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.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.World;

public class DeclareErrorOrWarning extends Declare {
	private boolean isError;
	private Pointcut pointcut;
	private String message;

	public DeclareErrorOrWarning(boolean isError, Pointcut pointcut, String message) {
		this.isError = isError;
		this.pointcut = pointcut;
		this.message = message;
	}

	/**
	 * returns "declare warning: <message>" or "declare error: <message>"
	 */
	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("declare ");
		if (isError) {
			buf.append("error: ");
		} else {
			buf.append("warning: ");
		}
		buf.append(pointcut);
		buf.append(": ");
		buf.append("\"");
		buf.append(message);
		buf.append("\";");
		return buf.toString();
	}

	public boolean equals(Object other) {
		if (!(other instanceof DeclareErrorOrWarning)) {
			return false;
		}
		DeclareErrorOrWarning o = (DeclareErrorOrWarning) other;
		return (o.isError == isError) && o.pointcut.equals(pointcut) && o.message.equals(message);
	}

	public int hashCode() {
		int result = isError ? 19 : 23;
		result = 37 * result + pointcut.hashCode();
		result = 37 * result + message.hashCode();
		return result;
	}

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

	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeByte(Declare.ERROR_OR_WARNING);
		s.writeBoolean(isError);
		pointcut.write(s);
		s.writeUTF(message);
		writeLocation(s);
	}

	public static Declare read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		Declare ret = new DeclareErrorOrWarning(s.readBoolean(), Pointcut.read(s, context), s.readUTF());
		ret.readLocation(context, s);
		return ret;
	}

	public boolean isError() {
		return isError;
	}

	public String getMessage() {
		return message;
	}

	public Pointcut getPointcut() {
		return pointcut;
	}

	public void resolve(IScope scope) {
		pointcut = pointcut.resolve(scope);
	}

	public Declare parameterizeWith(Map typeVariableBindingMap, World w) {
		Declare ret = new DeclareErrorOrWarning(isError, pointcut.parameterizeWith(typeVariableBindingMap, w), message);
		ret.copyLocationFrom(this);
		return ret;
	}

	public boolean isAdviceLike() {
		return true;
	}

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

	/**
	 * returns "declare warning" or "declare error"
	 */
	public String getName() {
		StringBuilder buf = new StringBuilder();
		buf.append("declare ");
		if (isError) {
			buf.append("error");
		} else {
			buf.append("warning");
		}
		return buf.toString();
	}
}