internal static Func <IDictionary <string, object>, bool> GetComparer <T>(string rangeParamName, T fromValue, T toValue) where T : IComparable
{
Comparer comparer = Comparer.DefaultInvariant;
bool sameRange = comparer.Compare(fromValue, toValue) == 0; // FromValue == ToValue
bool insideRange = comparer.Compare(fromValue, toValue) < 0; // FromValue < ToValue
Func <IDictionary <string, object>, bool> compareClause;
if (sameRange)
{
compareClause = data =>
{
if (data == null || data.Count <= 0)
{
return(false);
}
if (!data.ContainsKey(rangeParamName))
{
var error = string.Format("Cannot find column '{0}' for range query from {1} to {2} in Data={3}",
rangeParamName, fromValue, toValue, StorageProviderUtils.PrintData(data));
throw new KeyNotFoundException(error);
}
T obj = (T)data[rangeParamName];
return(comparer.Compare(obj, fromValue) == 0);
};
}
else if (insideRange)
{
compareClause = data =>
{
if (data == null || data.Count <= 0)
{
return(false);
}
if (!data.ContainsKey(rangeParamName))
{
var error = string.Format("Cannot find column '{0}' for range query from {1} to {2} in Data={3}",
rangeParamName, fromValue, toValue, StorageProviderUtils.PrintData(data));
throw new KeyNotFoundException(error);
}
T obj = (T)data[rangeParamName];
return(comparer.Compare(obj, fromValue) >= 0 && comparer.Compare(obj, toValue) <= 0);
};
}
else
{
compareClause = data =>
{
if (data == null || data.Count <= 0)
{
return(false);
}
if (!data.ContainsKey(rangeParamName))
{
var error = string.Format("Cannot find column '{0}' for range query from {1} to {2} in Data={3}",
rangeParamName, fromValue, toValue, StorageProviderUtils.PrintData(data));
throw new KeyNotFoundException(error);
}
T obj = (T)data[rangeParamName];
return(comparer.Compare(obj, fromValue) >= 0 || comparer.Compare(obj, toValue) <= 0);
};
}
return(compareClause);
}
/// <summary>
/// Return a hash value derived from the input grain type and id values.
/// </summary>
/// <param name="grainType">Fully qualified class type name for this grain</param>
/// <param name="grainReference">GrainI reference for this grain</param>
/// <returns>Stable hash value for this grain</returns>
protected virtual int HashFunction(string grainType, GrainReference grainReference)
{
return(StorageProviderUtils.PositiveHash(grainReference, storageProviders.Length));
}