internal static TypeUsage ValidateGroupBy(
IEnumerable <KeyValuePair <string, DbExpression> > keys,
IEnumerable <KeyValuePair <string, DbAggregate> > aggregates,
out DbExpressionList validKeys,
out ReadOnlyCollection <DbAggregate> validAggregates)
{
List <KeyValuePair <string, TypeUsage> > columns = new List <KeyValuePair <string, TypeUsage> >();
HashSet <string> keyNames = new HashSet <string>();
EnumerableValidator <KeyValuePair <string, DbExpression>, DbExpression, DbExpressionList> validator1 = ArgumentValidation.CreateValidator <KeyValuePair <string, DbExpression>, DbExpression, DbExpressionList>(keys, nameof(keys), (Func <KeyValuePair <string, DbExpression>, int, DbExpression>)((keyInfo, index) =>
{
ArgumentValidation.CheckNamed <DbExpression>(keyInfo, nameof(keys), index);
if (!TypeHelpers.IsValidGroupKeyType(keyInfo.Value.ResultType))
{
throw new ArgumentException(Strings.Cqt_GroupBy_KeyNotEqualityComparable((object)keyInfo.Key));
}
keyNames.Add(keyInfo.Key);
columns.Add(new KeyValuePair <string, TypeUsage>(keyInfo.Key, keyInfo.Value.ResultType));
return(keyInfo.Value);
}), (Func <List <DbExpression>, DbExpressionList>)(expList => new DbExpressionList((IList <DbExpression>)expList)));
validator1.AllowEmpty = true;
validator1.GetName = (Func <KeyValuePair <string, DbExpression>, int, string>)((keyInfo, idx) => keyInfo.Key);
validKeys = validator1.Validate();
bool hasGroupAggregate = false;
EnumerableValidator <KeyValuePair <string, DbAggregate>, DbAggregate, ReadOnlyCollection <DbAggregate> > validator2 = ArgumentValidation.CreateValidator <KeyValuePair <string, DbAggregate>, DbAggregate, ReadOnlyCollection <DbAggregate> >(aggregates, nameof(aggregates), (Func <KeyValuePair <string, DbAggregate>, int, DbAggregate>)((aggInfo, idx) =>
{
ArgumentValidation.CheckNamed <DbAggregate>(aggInfo, nameof(aggregates), idx);
if (keyNames.Contains(aggInfo.Key))
{
throw new ArgumentException(Strings.Cqt_GroupBy_AggregateColumnExistsAsGroupColumn((object)aggInfo.Key));
}
if (aggInfo.Value is DbGroupAggregate)
{
if (hasGroupAggregate)
{
throw new ArgumentException(Strings.Cqt_GroupBy_MoreThanOneGroupAggregate);
}
hasGroupAggregate = true;
}
columns.Add(new KeyValuePair <string, TypeUsage>(aggInfo.Key, aggInfo.Value.ResultType));
return(aggInfo.Value);
}), (Func <List <DbAggregate>, ReadOnlyCollection <DbAggregate> >)(aggList => ArgumentValidation.NewReadOnlyCollection <DbAggregate>((IList <DbAggregate>)aggList)));
validator2.AllowEmpty = true;
validator2.GetName = (Func <KeyValuePair <string, DbAggregate>, int, string>)((aggInfo, idx) => aggInfo.Key);
validAggregates = validator2.Validate();
if (validKeys.Count == 0 && validAggregates.Count == 0)
{
throw new ArgumentException(Strings.Cqt_GroupBy_AtLeastOneKeyOrAggregate);
}
return(ArgumentValidation.CreateCollectionOfRowResultType(columns));
}
internal static TypeUsage ValidateNewRow(
IEnumerable <KeyValuePair <string, DbExpression> > columnValues,
out DbExpressionList validElements)
{
List <KeyValuePair <string, TypeUsage> > columnTypes = new List <KeyValuePair <string, TypeUsage> >();
EnumerableValidator <KeyValuePair <string, DbExpression>, DbExpression, DbExpressionList> validator = ArgumentValidation.CreateValidator <KeyValuePair <string, DbExpression>, DbExpression, DbExpressionList>(columnValues, nameof(columnValues), (Func <KeyValuePair <string, DbExpression>, int, DbExpression>)((columnValue, idx) =>
{
ArgumentValidation.CheckNamed <DbExpression>(columnValue, nameof(columnValues), idx);
columnTypes.Add(new KeyValuePair <string, TypeUsage>(columnValue.Key, columnValue.Value.ResultType));
return(columnValue.Value);
}), (Func <List <DbExpression>, DbExpressionList>)(expList => new DbExpressionList((IList <DbExpression>)expList)));
validator.GetName = (Func <KeyValuePair <string, DbExpression>, int, string>)((columnValue, idx) => columnValue.Key);
validElements = validator.Validate();
return(ArgumentValidation.CreateResultType((EdmType)TypeHelpers.CreateRowType((IEnumerable <KeyValuePair <string, TypeUsage> >)columnTypes)));
}