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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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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
		}
	}
}