// Does not set any of the mapping information. Use the CreateBasicMap()
// factory method if you want the mapping dictionary filled in for symbols
// that match in both the alphabet and the encoding.
internal EncodingMap(IAlphabet alphabet, IEncoding encoding, EncodingMapDirection direction)
{
this.alphabet = alphabet;
this.encoding = encoding;
this.direction = direction;
}
// Does a direct symbol comparison to create the dictionary used in the mapping
// This is a useful starting point for any map. The dictionary can then be customized
// by adding or removing entries.
internal static EncodingMap CreateBasicMap(IAlphabet alphabet, IEncoding encoding, EncodingMapDirection direction)
{
EncodingMap result = new EncodingMap(alphabet, encoding, direction);
if (direction == EncodingMapDirection.AlphabetToEncoding)
{
foreach (ISequenceItem sourceItem in alphabet)
{
try
{
ISequenceItem resultItem = encoding.LookupBySymbol(sourceItem.Symbol);
result.map[sourceItem] = resultItem;
}
catch (Exception)
{
// Ignore the exception and just continue filling the dictionary
}
}
}
else if (direction == EncodingMapDirection.EncodingToAlphabet)
{
foreach (ISequenceItem sourceItem in encoding)
{
try
{
ISequenceItem resultItem = alphabet.LookupBySymbol(sourceItem.Symbol);
result.map[sourceItem] = resultItem;
}
catch (Exception)
{
// Ignore the exception and just continue filling the dictionary
}
}
}
return(result);
}
// Does a direct symbol comparison to create the dictionary used in the mapping
// This is a useful starting point for any map. The dictionary can then be customized
// by adding or removing entries.
internal static EncodingMap CreateBasicMap(IAlphabet alphabet, IEncoding encoding, EncodingMapDirection direction)
{
EncodingMap result = new EncodingMap(alphabet, encoding, direction);
if (direction == EncodingMapDirection.AlphabetToEncoding)
{
result.map = GetMap(
alphabet,
item => encoding.LookupBySymbol(item.Symbol));
}
else if (direction == EncodingMapDirection.EncodingToAlphabet)
{
result.map = GetMap(
encoding,
item => alphabet.LookupBySymbol(item.Symbol));
}
return(result);
}
