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Java > Open Source Codes > com > vladium > jcd > cls > attribute > LineNumber_info


1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
2  *
3  * This program and the accompanying materials are made available under
4  * the terms of the Common Public License v1.0 which accompanies this distribution,
5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
6  *
7  * $Id: LineNumber_info.java,v 1.1.1.1 2004/05/09 16:57:48 vlad_r Exp $
8  */
9 package com.vladium.jcd.cls.attribute;
10
11 import java.io.IOException JavaDoc;
12
13 import com.vladium.jcd.compiler.IClassFormatOutput;
14 import com.vladium.jcd.lib.UDataInputStream;
15 import com.vladium.jcd.lib.UDataOutputStream;
16
17 // ----------------------------------------------------------------------------
18 /**
19  * This class represents a line_number_table entry contained by
20  * {@link LineNumberTableAttribute_info} attribute. Each entry contains the
21  * following items:
22  * <PRE>
23  * start_pc
24  * </PRE>
25  * The value of the start_pc item must indicate the index into the code array
26  * at which the code for a new line in the original source file begins. The
27  * value of start_pc must be less than the value of the code_length item of
28  * the {@link CodeAttribute_info} attribute of which this LineNumberTable
29  * is an attribute.<P>
30  * <PRE>
31  * line_number
32  * </PRE>
33  * The value of the line_number item must give the corresponding line number
34  * in the original source file.
35  *
36  * @author Vlad Roubtsov, (C) 2003
37  */
38 public
39 final class LineNumber_info implements Cloneable JavaDoc, IClassFormatOutput
40 {
41     // public: ................................................................
42
43     public int m_start_pc, m_line_number;
44     
45     
46     public LineNumber_info (final int start_pc, final int line_number)
47     {
48         m_start_pc = start_pc;
49         m_line_number = line_number;
50     }
51     
52     public String JavaDoc toString ()
53     {
54         return "line_number_info: [start_pc = " + m_start_pc + ", line_number = " + m_line_number + "]";
55     }
56     
57     // Cloneable:
58
59     /**
60      * Performs a deep copy.
61      */
62     public Object JavaDoc clone ()
63     {
64         try
65         {
66             return super.clone ();
67         }
68         catch (CloneNotSupportedException JavaDoc e)
69         {
70             throw new InternalError JavaDoc (e.toString ());
71         }
72     }
73
74     // IClassFormatOutput:
75
76     public void writeInClassFormat (final UDataOutputStream out) throws IOException JavaDoc
77     {
78         out.writeU2 (m_start_pc);
79         out.writeU2 (m_line_number);
80     }
81     
82     // protected: .............................................................
83
84     // package: ...............................................................
85
86
87     LineNumber_info (final UDataInputStream bytes) throws IOException JavaDoc
88     {
89         m_start_pc = bytes.readU2 ();
90         m_line_number = bytes.readU2 ();
91     }
92     
93     // private: ...............................................................
94
95 } // end of class
96 // ----------------------------------------------------------------------------
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