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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;

import java.io.File;
import java.util.Arrays;

import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.SourceLocation;

public class SourceContextImpl implements ISourceContext {

	private int[] lineBreaks;
	String sourceFilename;

	public SourceContextImpl(AbstractReferenceTypeDelegate delegate) {
		sourceFilename = delegate.getSourcefilename();
	}

	public void configureFromAttribute(String name, int[] linebreaks) {
		this.sourceFilename = name;
		this.lineBreaks = linebreaks;
	}

	public void setSourceFileName(String name) {
		sourceFilename = name;
	}

	private File getSourceFile() {
		return new File(sourceFilename);
	}

	public void tidy() {
	}

	public int getOffset() {
		return 0;
	}

	public ISourceLocation makeSourceLocation(IHasPosition position) {
		if (lineBreaks != null) {
			int line = Arrays.binarySearch(lineBreaks, position.getStart());
			if (line < 0) {
				line = -line;
			}
			return new SourceLocation(getSourceFile(), line); // ??? have more info
		} else {
			return new SourceLocation(getSourceFile(), 0);
		}
	}

	public ISourceLocation makeSourceLocation(int line, int offset) {
		if (line < 0) {
			line = 0;
		}
		SourceLocation sl = new SourceLocation(getSourceFile(), line);
		if (offset > 0) {
			sl.setOffset(offset);
		} else {
			if (lineBreaks != null) {
				int likelyOffset = 0;
				if (line > 0 && line < lineBreaks.length) {
					// 1st char of given line is next char after previous end of line
					likelyOffset = lineBreaks[line - 1] + 1;
				}
				sl.setOffset(likelyOffset);
			}
		}
		return sl;
	}

	public final static ISourceContext UNKNOWN_SOURCE_CONTEXT = new ISourceContext() {
		public ISourceLocation makeSourceLocation(IHasPosition position) {
			return null;
		}

		public ISourceLocation makeSourceLocation(int line, int offset) {
			return null;
		}

		public int getOffset() {
			return 0;
		}

		public void tidy() {
		}
	};
}