Package org.aspectj.apache.bcel.generic

Source Code of org.aspectj.apache.bcel.generic.LineNumberGen

package org.aspectj.apache.bcel.generic;

/* ====================================================================
* 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 (http://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 apache@apache.org.
*
* 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
* <http://www.apache.org/>.
*/

import org.aspectj.apache.bcel.classfile.LineNumber;

/**
* This class represents a line number within a method, i.e., give an instruction
* a line number corresponding to the source code line.
*
* @version $Id: LineNumberGen.java,v 1.5 2008/05/28 23:53:00 aclement Exp $
* @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @see     LineNumber
* @see     MethodGen
*/
public class LineNumberGen
  implements InstructionTargeter, Cloneable, java.io.Serializable
{
  private InstructionHandle ih;
  private int               src_line;

  /**
   * Create a line number.
   *
   * @param ih instruction handle to reference
   */
  public LineNumberGen(InstructionHandle ih, int src_line) {
    setInstruction(ih);
    setSourceLine(src_line);
  }

  /**
   * @return true, if ih is target of this line number
   */
  public boolean containsTarget(InstructionHandle ih) {
    return this.ih == ih;
  }

  /**
   * @param old_ih old target
   * @param new_ih new target
   */
  public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
    if(old_ih != ih)
      throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
    else
      setInstruction(new_ih);
  }

  /**
   * Get LineNumber attribute .
   *
   * This relies on that the instruction list has already been dumped to byte code or
   * or that the `setPositions' methods has been called for the instruction list.
   */
  public LineNumber getLineNumber() {
    return new LineNumber(ih.getPosition(), src_line);
  }

  public void setInstruction(InstructionHandle ih) {
    InstructionBranch.notifyTarget(this.ih, ih, this);

    this.ih = ih;
  }

  public Object clone() {
    try {
      return super.clone();
    } catch(CloneNotSupportedException e) {
      System.err.println(e);
      return null;
    }
  }

  public InstructionHandle getInstruction()               { return ih; }
  public void              setSourceLine(int src_line)    { this.src_line = src_line; }
  public int               getSourceLine()                { return src_line; }
}
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