public IEnumerable <DynamicObject> Aggregate(DynamicObject spec = null)
{
DynamicObject query = null;
DynamicObject projection = null;
if (spec != null && spec.Exists("$match"))
{
query = (DynamicObject)spec.GetMember("$match");
}
if (spec != null && spec.Exists("$project"))
{
projection = (DynamicObject)spec.GetMember("$project");
}
IEnumerable <DynamicObject> result = this.Find(query, projection);
if (spec != null && spec.Exists("$skip"))
{
int n = (int)spec.GetMember("$skip");
result = result.Skip(n);
}
if (spec != null && spec.Exists("$limit"))
{
int n = (int)spec.GetMember("$limit");
result = result.Take(n);
}
if (spec != null && spec.Exists("$sort"))
{
DynamicObject sspec = (DynamicObject)spec.GetMember("$sort");
string[] fldnames = sspec.GetMemberNames().ToArray();
List <int> orders = new List <int>();
foreach (var fldname in fldnames)
{
orders.Add((int)sspec.GetMember(fldname) < 0 ? -1 : 1);
}
int[] fldorders = orders.ToArray();
return(result.OrderBy(dobj => dobj, new DynamicObjectComparer(fldnames, fldorders)));
}
return(result);
}
private bool Match(DynamicObject dynobj, string name)
{
var value = dynobj.GetMember(name);
foreach (var key in this.values.Keys)
{
if (key == "$exists")
{
if (!dynobj.Exists(name).Equals(this.GetMember(key)))
{
return(false);
}
else
{
continue;
}
}
if (key == "$lt")
{
if (!(((IComparable)value).CompareTo(this.EvaluateMember(key)) < 0))
{
return(false);
}
else
{
continue;
}
}
if (key == "$lte")
{
if (!(((IComparable)value).CompareTo(this.EvaluateMember(key)) <= 0))
{
return(false);
}
else
{
continue;
}
}
if (key == "$gt")
{
if (!(((IComparable)value).CompareTo(this.EvaluateMember(key)) > 0))
{
return(false);
}
else
{
continue;
}
}
if (key == "$gte")
{
if (!(((IComparable)value).CompareTo(this.EvaluateMember(key)) >= 0))
{
return(false);
}
else
{
continue;
}
}
if (key == "$ne")
{
if (value.Equals(this.EvaluateMember(key)))
{
return(false);
}
else
{
continue;
}
}
if (key == "$eq")
{
if (!value.Equals(this.EvaluateMember(key)))
{
return(false);
}
else
{
continue;
}
}
if (key == "$in")
{
if (!((IList)this.GetMember(key)).Contains(value))
{
return(false);
}
else
{
continue;
}
}
if (key == "$nin")
{
if (((IList)this.GetMember(key)).Contains(value))
{
return(false);
}
else
{
continue;
}
}
if (key == "$not")
{
if (((DynamicObject)this.GetMember(key)).Match(dynobj, name))
{
return(false);
}
else
{
continue;
}
}
if (key == "$or")
{
bool result = false;
foreach (var dobj in (IEnumerable <DynamicObject>) this.GetMember(key))
{
if (dobj.Match(dynobj, name))
{
result = true;
break;
}
}
if (!result)
{
return(false);
}
continue;
}
if (key == "$nor")
{
foreach (var dobj in (IEnumerable <DynamicObject>) this.GetMember(key))
{
if (dobj.Match(dynobj, name))
{
return(false);
}
}
continue;
}
if (key == "$and")
{
foreach (var dobj in (IEnumerable <DynamicObject>) this.GetMember(key))
{
if (!dobj.Match(dynobj, name))
{
return(false);
}
}
continue;
}
if (key == "$type")
{
Type type = (Type)this.GetMember(key);
if (!type.IsInstanceOfType(value))
{
return(false);
}
continue;
}
throw new InvalidOperationException(string.Format("Invalid operator '{0}'", key));
}
return(true);
}