/// <summary>
/// Calculates the encoded size of this field in bytes. This is the encoded size of the
/// underlying value as defined by the corresponding <c>FudgeFieldType</c>, the 2 byte
/// field prefix, plus the ordinal index and field name if specified. If a taxonomy is
/// specified and defines the field name, only the corresponding ordinal index would be
/// written so the field name is not counted.
/// </summary>
/// <param name="taxonomy">taxonomy used to resolve field names, or null</param>
/// <returns>the encoded size of this field in bytes</returns>
public override int ComputeSize(IFudgeTaxonomy taxonomy)
{
int size = 0;
// Field prefix
size += 2;
bool hasOrdinal = ordinal != null;
bool hasName = name != null;
if ((name != null) && (taxonomy != null))
{
if (taxonomy.GetFieldOrdinal(name) != null)
{
hasOrdinal = true;
hasName = false;
}
}
if (hasOrdinal)
{
size += 2;
}
if (hasName)
{
// One for the size prefix
size++;
// Then for the UTF Encoding
size += StringFieldType.Encoding.GetByteCount(name);
}
if (type.IsVariableSize)
{
int valueSize = type.GetVariableSize(value, taxonomy);
if (valueSize <= 255)
{
size += valueSize + 1;
}
else if (valueSize <= short.MaxValue)
{
size += valueSize + 2;
}
else
{
size += valueSize + 4;
}
}
else
{
size += type.FixedSize;
}
return(size);
}
