/// <summary>
/// Saves strongly typed document to collection.
/// <remarks>If document has property of type <see cref="ObjectId"/> and named 'Id' - it will be set after save</remarks>
/// </summary>
/// <typeparam name="TDocument">Document type</typeparam>
/// <param name="document">Document to save</param>
/// <param name="merge">If true the merge will be performed with old and new objects. Otherwise old object will be replaced</param>
/// <returns>Id of saved document</returns>
public unsafe ObjectId Save <TDocument>(TDocument document, bool merge)
{
using (var stream = Database.StreamPool.GetStream())
using (var writer = new BsonWriter(stream))
{
Serializer.Serialize(writer, document);
ObjectId objectId;
bool saveOk = false;
fixed(byte *streamPointer = &stream.GetBuffer()[0])
{
saveOk = _functions.SaveBson(CollectionHandle, streamPointer, &objectId, merge);
}
if (!saveOk)
{
throw EjdbException.FromDatabase(Database, "Failed to save document");
}
IdHelper <TDocument> .SetId(document, ref objectId);
return(objectId);
}
}
/// <summary>
/// Loads JSON object identified by OID from the collection.
/// </summary>
/// <remarks>
/// Returns <c>null</c> if object is not found.
/// </remarks>
/// <param name="id">Id of an object</param>
public TDocument Load <TDocument>(ObjectId id)
{
using (var bson = new BsonHandle(() => _functions.LoadBson(CollectionHandle, ref id), Database.Library))
{
//document does not exists
if (bson.IsInvalid)
{
return(default(TDocument));
}
using (var stream = Database.Library.ConvertToStream(bson))
using (var reader = new BsonReader(stream))
{
var document = Serializer.Deserialize <TDocument>(reader);
IdHelper <TDocument> .SetId(document, ref id);
return(document);
}
}
}
/// <summary>
/// Returns a result with specified index from results
/// </summary>
public unsafe TDocument this[int index]
{
get
{
EnsureInRange(index);
int size;
var resultPointer = CursorResult(index, out size);
using (var stream = new UnsafeStream(resultPointer))
using (var reader = new BsonReader(stream))
{
//TODO: Try to move this hack to deserialization step
var id = *((ObjectId *)(resultPointer + 9));
TDocument result = Serializer.Deserialize <TDocument>(reader);
IdHelper <TDocument> .SetId(result, ref id);
return(result);
}
}
}
