mcs/class/Mono.PEToolkit/metadata/Row.cs

   1 /*
   2  * Copyright (c) 2002 Sergey Chaban <serge@wildwestsoftware.com>
   3  */
   4
   5 using System;
   6 using System.IO;
   7
   8 namespace Mono.PEToolkit.Metadata {
   9
  10         /// <summary>
  11         /// Metadata row interface.
  12         /// </summary>
  13         public interface Row {
  14
  15                 /// <summary>
  16                 /// Number of colums in a row.
  17                 /// </summary>
  18                 int NumberOfColumns {get;}
  19
  20                 int Size {get;}
  21
  22                 /// <summary>
  23                 /// Returns reference to parent table or null.
  24                 /// </summary>
  25                 MDTable Table {get;}
  26
  27                 void FromRawData(byte [] buff, int offs);
  28
  29                 void Dump(TextWriter writer);
  30
  31         }
  32
  33
  34         public sealed class NullRow : Row {
  35                 public static readonly NullRow Instance;
  36
  37                 static NullRow()
  38                 {
  39                         Instance = new NullRow();
  40                 }
  41
  42                 private NullRow()
  43                 {
  44                 }
  45
  46                 public int NumberOfColumns {
  47                         get {
  48                                 return 0;
  49                         }
  50                 }
  51
  52                 public int Size {
  53                         get {
  54                                 return 0;
  55                         }
  56                 }
  57
  58                 public MDTable Table {
  59                         get {
  60                                 return null;
  61                         }
  62                 }
  63
  64                 public void FromRawData(byte [] buff, int offs)
  65                 {
  66                 }
  67
  68                 public void Dump(TextWriter writer)
  69                 {
  70                         writer.WriteLine("Null row.");
  71                 }
  72         }
  73
  74 }