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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;

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() {
		}
	};
}