/// <summary>
/// Creates new instance of LightningCursor
/// </summary>
/// <param name="db">Database</param>
/// <param name="txn">Transaction</param>
internal LightningCursor(LightningDatabase db, LightningTransaction txn)
{
if (db == null)
{
throw new ArgumentNullException(nameof(db));
}
if (txn == null)
{
throw new ArgumentNullException(nameof(txn));
}
_currentWithOptimizedPair = () => _currentPair;
_currentDefault = () =>
{
if (_currentKeyStructure.size == IntPtr.Zero)
{
return(default(KeyValuePair <byte[], byte[]>));
}
return(new KeyValuePair <byte[], byte[]>(_currentKeyStructure.GetBytes(),
_currentValueStructure.GetBytes()));
};
_getCurrent = _currentDefault;
mdb_cursor_open(txn.Handle(), db.Handle(), out _handle);
Database = db;
Transaction = txn;
Transaction.Disposing += Dispose;
}
private int IsDuplicate(ref ValueStructure left, ref ValueStructure right)
{
return(_duplicatesComparer.Compare(left.GetBytes(), right.GetBytes()));
}
private int Compare(ref ValueStructure left, ref ValueStructure right)
{
return(_comparer.Compare(left.GetBytes(), right.GetBytes()));
}