/// <summary>
/// Reads a BsonType from the reader.
/// </summary>
/// <typeparam name="TValue">The type of the BsonTrie values.</typeparam>
/// <param name="bsonTrie">An optional trie to search for a value that matches the next element name.</param>
/// <param name="found">Set to true if a matching value was found in the trie.</param>
/// <param name="value">Set to the matching value found in the trie or null if no matching value was found.</param>
/// <returns>A BsonType.</returns>
public override BsonType ReadBsonType <TValue>(BsonTrie <TValue> bsonTrie, out bool found, out TValue value)
{
if (Disposed)
{
ThrowObjectDisposedException();
}
found = false;
value = default(TValue);
if (State == BsonReaderState.Initial || State == BsonReaderState.Done || State == BsonReaderState.ScopeDocument)
{
// there is an implied type of Document for the top level and for scope documents
CurrentBsonType = BsonType.Document;
State = BsonReaderState.Value;
return(CurrentBsonType);
}
if (State != BsonReaderState.Type)
{
ThrowInvalidState("ReadBsonType", BsonReaderState.Type);
}
CurrentBsonType = _buffer.ReadBsonType();
if (CurrentBsonType == BsonType.EndOfDocument)
{
switch (_context.ContextType)
{
case ContextType.Array:
State = BsonReaderState.EndOfArray;
return(BsonType.EndOfDocument);
case ContextType.Document:
case ContextType.ScopeDocument:
State = BsonReaderState.EndOfDocument;
return(BsonType.EndOfDocument);
default:
var message = string.Format("BsonType EndOfDocument is not valid when ContextType is {0}.", _context.ContextType);
throw new FileFormatException(message);
}
}
else
{
switch (_context.ContextType)
{
case ContextType.Array:
_buffer.SkipCString(); // ignore array element names
State = BsonReaderState.Value;
break;
case ContextType.Document:
case ContextType.ScopeDocument:
CurrentName = _buffer.ReadName(bsonTrie, out found, out value);
State = BsonReaderState.Name;
break;
default:
throw new BsonInternalException("Unexpected ContextType.");
}
return(CurrentBsonType);
}
}