public static TryCatch <SingleGroupAggregator> TryCreate(
IReadOnlyDictionary <string, AggregateOperator?> aggregateAliasToAggregateType,
IReadOnlyList <string> orderedAliases,
string continuationToken)
{
CosmosObject aliasToContinuationToken;
if (continuationToken != null)
{
if (!CosmosElement.TryParse(continuationToken, out aliasToContinuationToken))
{
return(TryCatch <SingleGroupAggregator> .FromException(
new MalformedContinuationTokenException(
$"{nameof(SelectListAggregateValues)} continuation token is malformed: {continuationToken}.")));
}
}
else
{
aliasToContinuationToken = null;
}
Dictionary <string, AggregateValue> groupingTable = new Dictionary <string, AggregateValue>();
foreach (KeyValuePair <string, AggregateOperator?> aliasToAggregate in aggregateAliasToAggregateType)
{
string alias = aliasToAggregate.Key;
AggregateOperator?aggregateOperator = aliasToAggregate.Value;
string aliasContinuationToken;
if (aliasToContinuationToken != null)
{
if (!(aliasToContinuationToken[alias] is CosmosString parsedAliasContinuationToken))
{
return(TryCatch <SingleGroupAggregator> .FromException(
new MalformedContinuationTokenException(
$"{nameof(SelectListAggregateValues)} continuation token is malformed: {continuationToken}.")));
}
aliasContinuationToken = parsedAliasContinuationToken.Value;
}
else
{
aliasContinuationToken = null;
}
TryCatch <AggregateValue> tryCreateAggregateValue = AggregateValue.TryCreate(
aggregateOperator,
aliasContinuationToken);
if (tryCreateAggregateValue.Succeeded)
{
groupingTable[alias] = tryCreateAggregateValue.Result;
}
else
{
return(TryCatch <SingleGroupAggregator> .FromException(tryCreateAggregateValue.Exception));
}
}
return(TryCatch <SingleGroupAggregator> .FromResult(new SelectListAggregateValues(groupingTable, orderedAliases)));
}
public static TryCatch <SingleGroupAggregator> TryCreate(AggregateOperator?aggregateOperator, CosmosElement continuationToken)
{
return(AggregateValue.TryCreate(aggregateOperator, continuationToken)
.Try((aggregateValue) => (SingleGroupAggregator) new SelectValueAggregateValues(aggregateValue)));
}