public IOrderedDictionaryEnumerator <TK, TV> GetAdvancedEnumerator(AdvancedEnumeratorParam <TK> param) => throw new NotSupportedException();
public IOrderedDictionaryEnumerator <TKey, TValue> GetAdvancedEnumerator(AdvancedEnumeratorParam <TKey> param) => throw new NotImplementedException();
public AdvancedEnumerator(ODBDictionary <TKey, TValue> owner, AdvancedEnumeratorParam <TKey> param)
{
_owner = owner;
_keyValueTrProtector = _owner._keyValueTrProtector;
_keyValueTr = _owner._keyValueTr;
_ascending = param.Order == EnumerationOrder.Ascending;
_keyValueTrProtector.Start();
_prevModificationCounter = _owner._modificationCounter;
_prevProtectionCounter = _keyValueTrProtector.ProtectionCounter;
_keyValueTr.SetKeyPrefix(_owner._prefix);
long startIndex;
long endIndex;
if (param.EndProposition == KeyProposition.Ignored)
{
endIndex = _keyValueTr.GetKeyValueCount() - 1;
}
else
{
var keyBytes = _owner.KeyToByteArray(param.End);
switch (_keyValueTr.Find(keyBytes))
{
case FindResult.Exact:
endIndex = _keyValueTr.GetKeyIndex();
if (param.EndProposition == KeyProposition.Excluded)
{
endIndex--;
}
break;
case FindResult.Previous:
endIndex = _keyValueTr.GetKeyIndex();
break;
case FindResult.Next:
endIndex = _keyValueTr.GetKeyIndex() - 1;
break;
case FindResult.NotFound:
endIndex = -1;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
if (param.StartProposition == KeyProposition.Ignored)
{
startIndex = 0;
}
else
{
var keyBytes = _owner.KeyToByteArray(param.Start);
switch (_keyValueTr.Find(keyBytes))
{
case FindResult.Exact:
startIndex = _keyValueTr.GetKeyIndex();
if (param.StartProposition == KeyProposition.Excluded)
{
startIndex++;
}
break;
case FindResult.Previous:
startIndex = _keyValueTr.GetKeyIndex() + 1;
break;
case FindResult.Next:
startIndex = _keyValueTr.GetKeyIndex();
break;
case FindResult.NotFound:
startIndex = 0;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
_count = (uint)Math.Max(0, endIndex - startIndex + 1);
_startPos = (uint)(_ascending ? startIndex : endIndex);
_pos = 0;
_seekState = SeekState.Undefined;
}
GetAdvancedEnumerator(AdvancedEnumeratorParam <TKey> param) => throw new NotSupportedException();
