private Func <Triple, bool> Comparator(QueryUnit value)
{
var input = new JValue(value.Value);
switch (value.Operator)
{
case "gt":
return((Triple x) =>
{
var jValue = x.Object.ToTypedJSON();
return (jValue.CompareTo(input) > 0);
});
case "ge":
return((Triple x) =>
{
var jValue = x.Object.ToTypedJSON();
return (jValue.CompareTo(input) >= 0);
});
case "lt":
return((Triple x) =>
{
var jValue = x.Object.ToTypedJSON();
return (jValue.CompareTo(input) < 0);
});
case "le":
return((Triple x) =>
{
var jValue = x.Object.ToTypedJSON();
return (jValue.CompareTo(input) <= 0);
});
case "contains":
return((Triple x) =>
{
var jValue = x.Object.ToValue();
return jValue.Contains(value.Value.ToString());
});
default:
throw _storeErrors.UnknownComparator;
}
}
private IEnumerable <Triple> CreateConstraint(IStoreGraph graph, string key, QueryUnit value, Triple continuation)
{
var input = new JValue(value.Value);
switch (value.Operator)
{
case "eq":
return(graph.PO(key, TripleObject.FromData(value.Value.ToString()), continuation));
case "gt":
case "ge":
case "lt":
case "le":
case "contains":
return(graph.P(key, continuation).Where(Comparator(value)));
default:
throw _storeErrors.UnknownComparator;
}
}
private IEnumerable <Triple> ApplyConstraint(IEnumerable <Triple> rsp, IGraph graph, string key, QueryUnit value)
{
var input = new JValue(value.Value);
switch (value.Operator)
{
case "eq":
return(rsp.Where(x => graph.Exists(x.Subject, key, TripleObject.FromData(value.Value.ToString()))));
case "gt":
case "ge":
case "lt":
case "le":
case "contains":
return(rsp.Where((x) => {
var t = graph.SP(x.Subject, key).Any(Comparator(value));
return t;
}));
default:
throw _storeErrors.UnknownComparator;
}
}
