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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) 2010 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:
 *     Andy Clement - SpringSource
 * ******************************************************************/
package org.aspectj.weaver.patterns;

import java.io.IOException;

import org.aspectj.weaver.BCException;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.VersionedDataInputStream;

/**
 * Implements common functions to be used across ISignaturePatterns.
 *
 * @author Andy Clement
 * @since 1.6.9
 */
public abstract class AbstractSignaturePattern implements ISignaturePattern {

	protected void writePlaceholderLocation(CompressingDataOutputStream s) throws IOException {
		s.writeInt(0);
		s.writeInt(0);
	}

	public static ISignaturePattern readCompoundSignaturePattern(VersionedDataInputStream s, ISourceContext context)
			throws IOException {
		byte key = s.readByte();
		switch (key) {
		case PATTERN:
			return SignaturePattern.read(s, context);
		case AND:
			return AndSignaturePattern.readAndSignaturePattern(s, context);
		case OR:
			return OrSignaturePattern.readOrSignaturePattern(s, context);
		case NOT:
			return NotSignaturePattern.readNotSignaturePattern(s, context);
		default:
			throw new BCException("unknown SignatureTypePattern kind: " + key);
		}
	}

	public static void writeCompoundSignaturePattern(CompressingDataOutputStream s, ISignaturePattern sigPattern)
			throws IOException {
		if (sigPattern instanceof SignaturePattern) {
			s.writeByte(PATTERN);
			((SignaturePattern) sigPattern).write(s);
		} else if (sigPattern instanceof AndSignaturePattern) {
			AndSignaturePattern andSignaturePattern = (AndSignaturePattern) sigPattern;
			s.writeByte(AND);
			writeCompoundSignaturePattern(s, andSignaturePattern.getLeft());
			writeCompoundSignaturePattern(s, andSignaturePattern.getRight());
			s.writeInt(0);
			s.writeInt(0); // TODO positions not yet set properly
		} else if (sigPattern instanceof OrSignaturePattern) {
			OrSignaturePattern orSignaturePattern = (OrSignaturePattern) sigPattern;
			s.writeByte(OR);
			writeCompoundSignaturePattern(s, orSignaturePattern.getLeft());
			writeCompoundSignaturePattern(s, orSignaturePattern.getRight());
			s.writeInt(0);
			s.writeInt(0); // TODO positions not yet set properly
		} else {
			// negated
			NotSignaturePattern notSignaturePattern = (NotSignaturePattern) sigPattern;
			s.writeByte(NOT);
			writeCompoundSignaturePattern(s, notSignaturePattern.getNegated());
			s.writeInt(0);
			s.writeInt(0); // TODO positions not yet set properly
		}
	}
}