internal IEnumerable <SparqlResult> Having(IEnumerable <SparqlResult> resultsGroups, RdfQuery11Translator q)
{
// IEnumerable<SparqlResult> resultsGroups = enumerable as SparqlResult[] ?? enumerable.ToArray();
//if (!resultsGroups.Any()) return resultsGroups; //todo
return(this.Aggregate(resultsGroups, (result, testExpr) =>
{
switch (testExpr.AggregateLevel)
{
case SparqlExpression.VariableDependenceGroupLevel.Const:
return (bool)testExpr.Const.Content ? result : Enumerable.Empty <SparqlResult>();
case SparqlExpression.VariableDependenceGroupLevel.UndependableFunc:
return testExpr.Test(null) ? result : Enumerable.Empty <SparqlResult>();
case SparqlExpression.VariableDependenceGroupLevel.SimpleVariable:
return result.Where(testExpr.Test);
case SparqlExpression.VariableDependenceGroupLevel.Group:
var sparqlGroupOfResults = new SparqlGroupOfResults(q)
{
Group = result.Select(sparqlResult => sparqlResult.Clone()).ToArray()
};
return testExpr.Test(sparqlGroupOfResults) ? sparqlGroupOfResults.Group : Enumerable.Empty <SparqlResult>();
case SparqlExpression.VariableDependenceGroupLevel.GroupOfGroups:
default:
throw new Exception("requested grouping");
}
}));
}
internal IEnumerable <SparqlGroupOfResults> Having4CollectionGroups(
IEnumerable <SparqlGroupOfResults> resultsGroups, RdfQuery11Translator q)
{
return(this.Aggregate(resultsGroups, (result, testExpr) =>
{
switch (testExpr.AggregateLevel)
{
case SparqlExpression.VariableDependenceGroupLevel.Const:
if ((bool)testExpr.Const.Content)
{
return result;
}
else
{
return Enumerable.Empty <SparqlGroupOfResults>();
}
case SparqlExpression.VariableDependenceGroupLevel.UndependableFunc:
if ((bool)testExpr.Operator(null))
{
return result;
}
else
{
return Enumerable.Empty <SparqlGroupOfResults>();
}
case SparqlExpression.VariableDependenceGroupLevel.SimpleVariable:
case SparqlExpression.VariableDependenceGroupLevel.Group:
return result.Where(testExpr.Test);
case SparqlExpression.VariableDependenceGroupLevel.GroupOfGroups:
var group = new SparqlGroupOfResults(q)
{
Group = result.Select(sparqlResult => sparqlResult.Clone()).ToArray()
};
return testExpr.Test(group) ? group.Group.Cast <SparqlGroupOfResults>() : Enumerable.Empty <SparqlGroupOfResults>();
default:
throw new ArgumentOutOfRangeException();
}
return resultsGroups;
}));
}
public IEnumerable <SparqlResult> Run4Grouped(IEnumerable <SparqlResult> variableBindings)
{
switch (sparqlExpression.AggregateLevel)
{
case SparqlExpression.VariableDependenceGroupLevel.Const:
return(variableBindings.Select(
variableBinding =>
{
variableBinding.Add(variableNode, sparqlExpression.Const);
return variableBinding;
}));
break;
case SparqlExpression.VariableDependenceGroupLevel.UndependableFunc:
case SparqlExpression.VariableDependenceGroupLevel.SimpleVariable:
case SparqlExpression.VariableDependenceGroupLevel.Group:
return(RunAddVar(variableBindings));
break;
case SparqlExpression.VariableDependenceGroupLevel.GroupOfGroups:
var arr = variableBindings as SparqlResult[] ?? variableBindings.Select(result => result.Clone()).ToArray();
var groupOfGroups = new SparqlGroupOfResults(q)
{
Group = arr
};
return(arr.Select(variableBinding =>
{
variableBinding.Add(variableNode, sparqlExpression.TypedOperator(groupOfGroups));
return variableBinding;
}));
break;
default:
throw new ArgumentOutOfRangeException();
}
}
