return _model.getSessionIDCount(_key);
}
public Object getValueAt(int rowIndex, int columnIndex) {
if (_key == null) return null;
SessionID id = _model.getSessionIDAt(_key, rowIndex);
switch(columnIndex) {
case 0: return id.getDate();
case 1: return id.getValue();
case 2: return _model.getSessionIDValue(_key, id);
case 3:
if (rowIndex == 0) {
return null;
} else {
SessionID prev = _model.getSessionIDAt(_key, rowIndex - 1);
BigInteger prevValue = _model.getSessionIDValue(_key, prev);
BigInteger now = _model.getSessionIDValue(_key, id);
if (now != null && prevValue != null) {
return now.subtract(prevValue);
} else {