} // end method
private IEnumerable<T> CreateObjects<T>(IEnumerable<IRecord> records,
CursorData cursorData) where T : new() {
var objs = new List<T>();
foreach (var record in records)
objs.Add(CreateObject<T>(record));
return objs;
} // end method
} // end method
internal IEnumerable<CursorData> SplitLargeCollections(int maxParameters) {
var cursorDatas = new List<CursorData>();
if (criteria != null)
foreach (var criterion in criteria)
criterion.Distinctify();
var largest = GetLargestCollectionCriterion(ref maxParameters);
if (largest == null)
cursorDatas.Add(this);
else {
// Get the vals from the largest collection and then set the Value to null.
// Value is set to null to allow it to be null when the criterion is cloned
// and is reset its intial value after the split is done.
var vals = largest.GetValues();
largest.Value = null;
CursorData clone = null;
Criterion replacementCriterion = null;
List<object> replacementVals = null;
foreach (var val in vals) {
// If clone is null, which would be either the first iteration or one
// following a break, clone the current CursorData, get a reference to
// the criterion matching the largest criterion (replacementCriterion)
// and set its value to a new list.
if (clone == null) {
clone = Clone();
replacementCriterion = clone.criteria.First(c =>
c.Name == largest.Name &&
c.Operation == largest.Operation &&
c.Value == null);
replacementVals = new List<object>();
replacementCriterion.Value = replacementVals;
} // end if
replacementVals.Add(val);
// Iteration break: when replacementVals is at the max, add the clone
// to cursorDatas and set it to null. If there are move values to add,
// the next iteration will create a new clone.
if (replacementVals.Count == maxParameters) {
cursorDatas.Add(clone);
clone = null;
} // end if
} // end foreach
// If there is clone (and there probably is) add it to cursorDatas.
if (clone != null)
cursorDatas.Add(clone);
largest.Value = vals; // Reset Value to its original, er... value.
} // end if-else
return cursorDatas;
} // end method
public CursorData Clone() {
var newCursorData = new CursorData();
if (criteria != null) {
var newCriteria = new List<Criterion>();
foreach (var criterion in criteria)
newCriteria.Add(criterion.Clone());
newCursorData.criteria = newCriteria;
} // end if
newCursorData.limit = limit;
newCursorData.skip = skip;
if (sort != null) {
var newSort = new Dictionary<string, int>();
foreach (var key in sort.Keys)
newSort[key] = sort[key];
newCursorData.sort = newSort;
} // end if
return newCursorData;
} // end method
public abstract IEnumerable <IRecord> Fetch(IEnumerable <string> tableNames, CursorData cursorData);
