/// <summary>
/// Find witch index will be used and run Execute method - define ExecuteMode here
/// </summary>
internal virtual IEnumerable <IndexNode> Run <T>(LiteCollection <T> collection)
where T : new()
{
// get collection page - no collection, no results
var col = collection.GetCollectionPage(false);
// no collection just returns an empty list of indexnode
if (col == null)
{
return(new List <IndexNode>());
}
// get index
var index = col.GetIndex(this.Field);
// if index not found, lets check if type T has [BsonIndex]
if (index == null && typeof(T) != typeof(BsonDocument))
{
var options = collection.Database.Mapper.GetIndexFromAttribute <T>(this.Field);
// create a new index using BsonIndex options
if (options != null)
{
collection.EnsureIndex(this.Field, options);
index = col.GetIndex(this.Field);
}
}
// if no index, let's auto create an index with default index options
if (index == null)
{
collection.EnsureIndex(this.Field);
index = col.GetIndex(this.Field);
}
// execute query to get all IndexNodes
return(this.ExecuteIndex(collection.Database.Indexer, index));
}
/// <summary>
/// Find witch index will be used and run Execute method - define ExecuteMode here
/// </summary>
internal virtual IEnumerable <IndexNode> Run <T>(LiteCollection <T> collection)
where T : new()
{
// get collection page - no collection, no results
var col = collection.GetCollectionPage(false);
// no collection just returns an empty list of indexnode
if (col == null)
{
return(new List <IndexNode>());
}
// get index
var index = col.GetIndex(this.Field);
// if index not found, lets check if type T has [BsonIndex]
if (index == null && typeof(T) != typeof(BsonDocument))
{
var options = collection.Database.Mapper.GetIndexFromAttribute <T>(this.Field);
// create a new index
if (options != null)
{
collection.EnsureIndex(this.Field, options);
index = col.GetIndex(this.Field);
}
}
if (index == null)
{
this.ExecuteMode = QueryExecuteMode.FullScan;
// normalize query values before run full scan
this.NormalizeValues(new IndexOptions());
// if there is no index, returns all index nodes - will be used Full Scan
return(collection.Database.Indexer.FindAll(col.PK, Query.Ascending));
}
else
{
this.ExecuteMode = QueryExecuteMode.IndexSeek;
// execute query to get all IndexNodes
return(this.ExecuteIndex(collection.Database.Indexer, index));
}
}