/// <returns>null if eval invalid type</returns>
private static int?Calculate(object eval,
PartitionUtil partitionUtil,
int keyType,
int hashSliceStart,
int hashSliceEnd)
{
if (eval == ExpressionConstants.Unevaluatable || eval == null)
{
return(null);
}
switch (keyType)
{
case PartitionKeyTypeLong:
{
long longVal;
if (eval is Number)
{
longVal = (long)(Number)eval;
}
else if (eval is string)
{
longVal = long.Parse((string)eval);
}
else
{
throw new ArgumentException("unsupported data type for partition key: " + eval.GetType());
}
return(partitionUtil.Partition(longVal));
}
case PartitionKeyTypeString:
{
var key = eval.ToString();
var start = hashSliceStart >= 0 ? hashSliceStart : key.Length + hashSliceStart;
var end = hashSliceEnd > 0 ? hashSliceEnd : key.Length + hashSliceEnd;
var hash = StringUtil.Hash(key, start, end);
return(partitionUtil.Partition(hash));
}
default:
{
throw new ArgumentException("unsupported partition key type: " + keyType);
}
}
}
protected internal virtual int PartitionIndex(long hash)
{
return(PartitionUtil.Partition(hash));
}
