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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) 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.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.bridge.ISourceLocation;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.IHasSourceLocation;
import org.aspectj.weaver.ISourceContext;

public abstract class PatternNode implements IHasSourceLocation {
	protected int start, end;
	protected ISourceContext sourceContext;

	public PatternNode() {
		super();
		start = end = -1;
	}

	public int getStart() {
		return start + (sourceContext != null ? sourceContext.getOffset() : 0);
	}

	public int getEnd() {
		return end + (sourceContext != null ? sourceContext.getOffset() : 0);
	}

	public ISourceContext getSourceContext() {
		return sourceContext;
	}

	public String getFileName() {
		return "unknown";
	}

	public void setLocation(ISourceContext sourceContext, int start, int end) {
		this.sourceContext = sourceContext;
		this.start = start;
		this.end = end;
	}

	public void copyLocationFrom(PatternNode other) {
		this.start = other.start;
		this.end = other.end;
		this.sourceContext = other.sourceContext;
	}

	public ISourceLocation getSourceLocation() {
		// System.out.println("get context: " + this + " is " + sourceContext);
		if (sourceContext == null) {
			// System.err.println("no context: " + this);
			return null;
		}
		return sourceContext.makeSourceLocation(this);
	}

	public abstract void write(CompressingDataOutputStream s) throws IOException;

	public void writeLocation(DataOutputStream s) throws IOException {
		s.writeInt(start);
		s.writeInt(end);
	}

	public void readLocation(ISourceContext context, DataInputStream s) throws IOException {
		start = s.readInt();
		end = s.readInt();
		this.sourceContext = context;
	}

	public abstract Object accept(PatternNodeVisitor visitor, Object data);

	public Object traverse(PatternNodeVisitor visitor, Object data) {
		return accept(visitor, data);
	}
}