protected override void InternalReset()
{
_sourceTable.Reset();
_sourceCounter = 0;
_lastCompareRow.ClearValues();
_hasLastCompareRow = false;
}
protected void FindUniqueKey()
{
if (!(_table.BOF() || _table.EOF()))
{
if (_uniqueKey == null)
{
_uniqueKey = BuildUniqueKeyRow();
}
else
{
_uniqueKey.ClearValues();
}
_table.Select(_uniqueKey);
}
else
if (_uniqueKey != null)
{
_uniqueKey.Dispose();
_uniqueKey = null;
}
}
protected override bool InternalNext()
{
if (!_scan.Next())
{
ITable table;
while (_sourceTables.Count > 0)
{
// Retrieve the current cursor to be iterated
table = (ITable)_sourceTables[0];
bool contextPopped = false;
bool contextPushed = false;
if (_sourceTables.Count > 1)
{
// Push it's parent row context, if necessary
Program.Stack.Push(_parentRows.Peek(0));
contextPushed = true;
}
try
{
if (table.Next())
{
_sequence++;
table.Select(_sourceRow);
if (contextPushed)
{
contextPopped = true;
Program.Stack.Pop();
}
_targetRow.ClearValues();
for (int index = 0; index < _sourceRow.DataType.Columns.Count; index++)
{
_targetRow[index] = _sourceRow[index];
}
if (Node.LevelColumnIndex >= 0)
{
_targetRow[Node.LevelColumnIndex] = _sourceTables.Count;
}
if (_sequenceColumnIndex >= 0)
{
_targetRow[_sequenceColumnIndex] = _sequence;
}
_buffer.Insert(Manager, _targetRow);
if (!_scan.FindKey(_targetRow))
{
throw new RuntimeException(RuntimeException.Codes.NewRowNotFound);
}
// Use the current row to push a new cursor looking for children of this row
PushSourceTable(_sourceRow);
return(true);
}
else
{
// The current cursor has been exhausted, pop it.
PopSourceTable();
}
}
finally
{
if (contextPushed && !contextPopped)
{
Program.Stack.Pop();
}
}
}
return(false);
}
return(true);
}
