1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  
57  import org.apache.bcel.Constants;
58  import org.apache.bcel.classfile.*;
59  
60  /*** 
61   * This class represents a line number within a method, i.e., give an instruction
62   * a line number corresponding to the source code line.
63   *
64   * @version $Id: LineNumberGen.java,v 1.3 2002/07/11 19:39:04 mdahm Exp $
65   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66   * @see     LineNumber
67   * @see     MethodGen
68   */
69  public class LineNumberGen
70    implements InstructionTargeter, Cloneable, java.io.Serializable
71  {
72    private InstructionHandle ih;
73    private int               src_line;
74  
75    /***
76     * Create a line number.
77     *
78     * @param ih instruction handle to reference
79     */
80    public LineNumberGen(InstructionHandle ih, int src_line) {
81      setInstruction(ih);
82      setSourceLine(src_line);
83    }
84  
85    /***
86     * @return true, if ih is target of this line number
87     */
88    public boolean containsTarget(InstructionHandle ih) {
89      return this.ih == ih;
90    }
91  
92    /***
93     * @param old_ih old target
94     * @param new_ih new target
95     */
96    public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
97      if(old_ih != ih)
98        throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
99      else
100       setInstruction(new_ih);
101   }
102 
103   /***
104    * Get LineNumber attribute .
105    *
106    * This relies on that the instruction list has already been dumped to byte code or
107    * or that the `setPositions' methods has been called for the instruction list.
108    */
109   public LineNumber getLineNumber() {
110     return new LineNumber(ih.getPosition(), src_line);
111   }
112 
113   public void setInstruction(InstructionHandle ih) {
114     BranchInstruction.notifyTarget(this.ih, ih, this);
115 
116     this.ih = ih;
117   }
118 
119   public Object clone() {
120     try {
121       return super.clone();
122     } catch(CloneNotSupportedException e) {
123       System.err.println(e);
124       return null;
125     }
126   }
127 
128   public InstructionHandle getInstruction()               { return ih; }
129   public void              setSourceLine(int src_line)    { this.src_line = src_line; }
130   public int               getSourceLine()                { return src_line; }
131 }
This page was automatically generated by Maven