/// <summary>
/// Parse queries such as:
/// "aggregate(Amount with sum as Total)" and "aggregate(Amount mul Product/TaxRate with sum as Tax)"
/// </summary>
/// <param name="apply"></param>
/// <param name="query"></param>
/// <param name="oDataUriParserConfiguration"></param>
/// <param name="edmType"></param>
/// <param name="edmNavigationSource"></param>
/// <returns></returns>
private static ApplyAggregateClause ParseAggregate(ApplyClause apply, string query, ODataUriParserConfiguration oDataUriParserConfiguration, IEdmType edmType, IEdmNavigationSource edmNavigationSource)
{
query = IsolateQuery(query, UriQueryConstants.AggregateTransformation);
string aggregatableProperty;
string aggregationMethod;
string alias;
aggregatableProperty = GetAggregatableProperty(query, true, out alias, out aggregationMethod);
//create an projection Expression to the property
var AggregatablePropertyExpression = ODataQueryOptionParser.ParseExpressionImplementation(
aggregatableProperty,
oDataUriParserConfiguration,
edmType,
edmNavigationSource);
return(new ApplyAggregateClause()
{
AggregatablePropertyExpression = AggregatablePropertyExpression,
Alias = alias,
AggregationMethod = aggregationMethod,
AggregatableProperty = aggregatableProperty,
Apply = apply
});
}
/// <summary>
/// Parse queries such as : "groupby(Customer/Name,Customer/ID,Product/Name,Account)" or "groupby((Customer/Country,Product/Name), aggregate(Amount with sum as Total))"
/// </summary>
/// <param name="apply"></param>
/// <param name="query"></param>
/// <param name="oDataUriParserConfiguration"></param>
/// <param name="edmType"></param>
/// <param name="edmNavigationSource"></param>
/// <returns></returns>
private static ApplyGroupbyClause ParseGroupBy(ApplyClause apply, string query,
ODataUriParserConfiguration oDataUriParserConfiguration, IEdmType edmType, IEdmNavigationSource edmNavigationSource)
{
string selectQuery;
ApplyAggregateClause aggregateClause = null;
query = IsolateQuery(query, UriQueryConstants.GroupbyTransformation);
if (query.StartsWith("(") && query.EndsWith(")"))
{
query = query.TrimOne('(', ')');
}
var p = query.IndexOf(UriQueryConstants.AggregateTransformation + '(');
if (p == -1)
{
if (query.StartsWith("(") && query.EndsWith(")"))
{
query = query.TrimOne('(', ')');
}
selectQuery = query;
}
else
{
selectQuery = query.Substring(0, p).Trim().Trim(',').TrimOne('(', ')');
aggregateClause = ParseAggregate(apply, query.Substring(p), oDataUriParserConfiguration, edmType, edmNavigationSource);
}
var selectedStatements = selectQuery.Split(',');
var withIndex = selectQuery.IndexOf("with");
if (withIndex > 0)
{
selectedStatements = selectQuery.Substring(0, withIndex).Split(',');
var withStatement = selectQuery.Substring(withIndex, selectQuery.Length - withIndex);
selectedStatements[selectedStatements.Count() - 1] =
selectedStatements[selectedStatements.Count() - 1] + withStatement;
}
string aggregationMethod, alias;
List <ExpressionClause> aggregatablePropertyExpressions = null;
try
{
aggregatablePropertyExpressions =
selectedStatements.Select(statement => ODataQueryOptionParser.ParseExpressionImplementation(
GetAggregatableProperty(statement, false, out alias, out aggregationMethod),
oDataUriParserConfiguration,
edmType,
edmNavigationSource)).ToList();
}
catch (Exception)
{
//parsing of some expressions (like property on enum such as DateTimeOffset/Minute) are not supported so ODataQueryOptionParser.ParseExpressionImplementation will fail
aggregatablePropertyExpressions = null;
}
return(new ApplyGroupbyClause()
{
SelectedStatements = selectedStatements,
SelectedPropertiesExpressions = aggregatablePropertyExpressions,
Aggregate = aggregateClause,
Apply = apply
});
}
