[Mono-devel-list] String constants and localization (possible implementation)

[Andreas Nahr]

Hi,

this would be a possible implementation

Andreas

#define LoadFromResource
// possible defines are: LoadFromFileUncached, LoadFromFileCached,
LoadFromResource
#define CheckIntegrity

using System;
using System.Resources;
using System.IO;
using System.Collections;

public sealed class MS
{
 public enum String
 {
  GenericParameterNullNotAllowed,
  GenericParameterSmallerThan0NotAllowed,
  GenericParameterLargerThan0NotAllowed,
  GenericParameterSmallerThan1NotAllowed,
  GenericParameterLargerThan1NotAllowed,
  UriFormatException,
  Uri_HexEscape,
  Uri_NotDetermined,
  Uri_InvalidPort,
  Uri_NoHostParse,
  CodeGenerator_InvalidIdentifier,
  BitVector32_IsNegative,
  BitVector32_TooLarge,
  BitVector32_Exceed32BitSection
 }

 private static string ResourceName = "StringData.bin";
 private static BinaryReader reader;

 private MS()
 {
 }

 public static string GetString (MS.String stringResource)
 {
  if (reader == null)
   lock (typeof (MS))
   {
    if (reader == null)
     CreateReader ();
   }

  int ResourceIndex = (int)stringResource;
  lock (reader)
  {
   reader.BaseStream.Seek (4 + ResourceIndex * 4, SeekOrigin.Begin);
   ResourceIndex = reader.ReadInt32 ();
   if (ResourceIndex == -1)
    return string.Empty;
   else
   {
    reader.BaseStream.Seek (ResourceIndex, SeekOrigin.Begin);
    return reader.ReadString ();
   }
  }
 }

 private static void CreateReader ()
 {
  Stream DataStream;
  #if LoadFromFileUncached
   DataStream = new FileStream (ResourceName, FileMode.Open);
  #endif
  #if LoadFromFileCached
   FileStream FileS = new FileStream (ResourceName, FileMode.Open);
   byte[] DataStore = new byte[FileS.Length];
   FileS.Read (DataStore, 0, (int)FileS.Length);
   FileS.Close ();
   DataStream = new MemoryStream (DataStore);
  #endif
  #if LoadFromResource
   DataStream = System.Reflection.Assembly.GetExecutingAssembly
().GetManifestResourceStream ("MonoString." + ResourceName);
  #endif

  if (DataStream == null)
   throw new Exception ("Invalid string resource file");

  BinaryReader prepareReader = new BinaryReader (DataStream);

  #if CheckIntegrity
   // Simple integrity check
   int Entries = prepareReader.ReadInt32 ();
   if (Entries != Enum.GetValues (typeof (MS.String)).Length)
    throw new Exception ("Invalid string resource file");
  #endif

  reader = prepareReader;
 }
}