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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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package org.aspectj.apache.bcel.classfile;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (https://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */

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

import org.aspectj.apache.bcel.Constants;

/**
 * This class is derived from Attribute and represents a reference to the source file of this class. At most one SourceFile
 * attribute should appear per classfile. The intention of this class is that it is instantiated from the
 * Attribute.readAttribute() method.
 *
 * @version $Id: SourceFile.java,v 1.5 2009/09/15 19:40:12 aclement Exp $
 * @author M. Dahm
 * @see Attribute
 */
public final class SourceFile extends Attribute {
	private int sourcefile_index;

	/**
	 * Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a physical
	 * copy.
	 */
	public SourceFile(SourceFile c) {
		this(c.getNameIndex(), c.getLength(), c.getSourceFileIndex(), c.getConstantPool());
	}

	/**
	 * Construct object from file stream.
	 *
	 * @param name_index Index in constant pool to CONSTANT_Utf8
	 * @param length Content length in bytes
	 * @param file Input stream
	 * @param constant_pool Array of constants
	 * @throws IOException
	 */
	SourceFile(int name_index, int length, DataInputStream file, ConstantPool constant_pool) throws IOException {
		this(name_index, length, file.readUnsignedShort(), constant_pool);
	}

	/**
	 * @param name_index Index in constant pool to CONSTANT_Utf8, which should represent the string "SourceFile".
	 * @param length Content length in bytes, the value should be 2.
	 * @param constant_pool The constant pool that this attribute is associated with.
	 * @param sourcefile_index Index in constant pool to CONSTANT_Utf8. This string will be interpreted as the name of the file from
	 *        which this class was compiled. It will not be interpreted as indicating the name of the directory contqining the file
	 *        or an absolute path; this information has to be supplied the consumer of this attribute - in many cases, the JVM.
	 */
	public SourceFile(int name_index, int length, int sourcefile_index, ConstantPool constant_pool) {
		super(Constants.ATTR_SOURCE_FILE, name_index, length, constant_pool);
		this.sourcefile_index = sourcefile_index;
	}

	/**
	 * Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the
	 * hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
	 *
	 * @param v Visitor object
	 */
	@Override
	public void accept(ClassVisitor v) {
		v.visitSourceFile(this);
	}

	/**
	 * Dump source file attribute to file stream in binary format.
	 *
	 * @param file Output file stream
	 * @throws IOException
	 */
	@Override
	public final void dump(DataOutputStream file) throws IOException {
		super.dump(file);
		file.writeShort(sourcefile_index);
	}

	/**
	 * @return Index in constant pool of source file name.
	 */
	public final int getSourceFileIndex() {
		return sourcefile_index;
	}

	/**
	 * @param sourcefile_index.
	 */
	public final void setSourceFileIndex(int sourcefile_index) {
		this.sourcefile_index = sourcefile_index;
	}

	/**
	 * @return Source file name.
	 */
	public final String getSourceFileName() {
		ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(sourcefile_index, Constants.CONSTANT_Utf8);
		return c.getValue();
	}

	/**
	 * @return String representation
	 */
	@Override
	public final String toString() {
		return "SourceFile(" + getSourceFileName() + ")";
	}

	/**
	 * @return deep copy of this attribute //
	 */
	// @Override
	// public Attribute copy(ConstantPool constant_pool) {
	// return (SourceFile) clone();
	// }
}