internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
// define order
var order = _start.CompareTo(_end) <= 0 ? Query.Ascending : Query.Descending;
// find first indexNode
var node = indexer.Find(index, _start, true, order);
// returns (or not) equals start value
while (node != null)
{
var diff = node.Key.CompareTo(_start);
// if current value are not equals start, go out this loop
if (diff != 0)
{
break;
}
if (_startEquals)
{
yield return(node);
}
node = indexer.GetNode(node.NextPrev(0, order));
}
// navigate using next[0] do next node - if less or equals returns
while (node != null)
{
var diff = node.Key.CompareTo(_end);
if (_endEquals && diff == 0)
{
yield return(node);
}
else if (diff == -order)
{
yield return(node);
}
else
{
break;
}
node = indexer.GetNode(node.NextPrev(0, order));
}
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
// find first indexNode
var node = indexer.Find(index, _value, true, Query.Ascending);
if (node == null)
{
yield break;
}
// move until next is last
while (node != null)
{
// compares only with are same type
if (node.Key.Type == _value.Type || (node.Key.IsNumber && _value.IsNumber))
{
var diff = node.Key.CompareTo(_value);
if (diff == 1 || (_equals && diff == 0))
{
if (node.IsHeadTail(index))
{
yield break;
}
yield return(node);
}
}
node = indexer.GetNode(node.Next[0]);
}
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
// find first indexNode
var node = indexer.Find(index, _value, true, Query.Ascending);
var str = _value.AsString;
// navigate using next[0] do next node - if less or equals returns
while (node != null)
{
var valueString = node.Key.AsString;
// value will not be null because null occurs before string (bsontype sort order)
if (valueString.StartsWith(str))
{
if (!node.DataBlock.IsEmpty)
{
yield return(node);
}
}
else
{
break; // if no more starts with, stop scanning
}
node = indexer.GetNode(node.Next[0]);
}
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
var node = indexer.Find(index, _value, false, Query.Ascending);
if (node == null)
{
yield break;
}
yield return(node);
if (index.Unique == false)
{
// navigate using next[0] do next node - if equals, returns
while (!node.Next[0].IsEmpty && ((node = indexer.GetNode(node.Next[0])).Key.CompareTo(_value) == 0))
{
if (node.IsHeadTail(index))
{
yield break;
}
yield return(node);
}
}
}
