public CollectionService(PageService pager, IndexService indexer, DataService data, TransactionService trans, Logger log)
{
_pager = pager;
_indexer = indexer;
_data = data;
_trans = trans;
_log = log;
}
/// <summary>
/// Create instances for all engine services
/// </summary>
private void InitializeServices()
{
_cache = new CacheService(_disk, _log);
_pager = new PageService(_disk, _crypto, _cache, _log);
_indexer = new IndexService(_pager, _log);
_data = new DataService(_pager, _log);
_trans = new TransactionService(_disk, _crypto, _pager, _cache, _cacheSize, _log);
_collections = new CollectionService(_pager, _indexer, _data, _trans, _log);
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
foreach (var value in _values.Distinct())
{
foreach (var node in Query.EQ(this.Field, value).ExecuteIndex(indexer, index))
{
yield return(node);
}
}
}
internal override IEnumerable <IndexNode> Run(CollectionPage col, IndexService indexer)
{
var left = _left.Run(col, indexer);
var right = _right.Run(col, indexer);
// if any query (left/right) is FullScan, this query is full scan too
this.UseIndex = _left.UseIndex && _right.UseIndex;
this.UseFilter = _left.UseFilter || _right.UseFilter;
return(left.Union(right, new IndexNodeComparer()));
}
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> Run(CollectionPage col, IndexService indexer)
{
// run base query
var result = _query.Run(col, indexer);
this.UseIndex = _query.UseIndex;
this.UseFilter = _query.UseFilter;
if (_query.UseIndex)
{
// if is by index, resolve here
var all = new QueryAll("_id", _order).Run(col, indexer);
return(all.Except(result, new IndexNodeComparer()));
}
else
{
// if is by document, must return all nodes to be ExecuteDocument after
return(result);
}
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
foreach (var node in indexer.FindAll(index, Query.Ascending))
{
// 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))
{
break;
}
if (node.IsHeadTail(index))
{
yield break;
}
yield return(node);
}
}
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
return(indexer.FindAll(index, _order));
}
/// <summary> /// Abstract method that must be implement for index seek/scan - Returns IndexNodes that match with index /// </summary> internal abstract IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index);
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
throw new NotSupportedException();
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
yield break;
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
return(indexer
.FindAll(index, Query.Ascending)
.Where(x => x.Key.CompareTo(_value) != 0));
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
return(indexer
.FindAll(index, Query.Ascending)
.Where(x => x.Key.IsString && x.Key.AsString.Contains(_value)));
}