public static function getRowMap($key=NULL)
    {
        if ($key) {
            return isset(self::$_keyRowMap[$key]) ? self::$_keyRowMap[$key] : NULL;
        } else {
            return self::$_keyRowMap;
        }
    }
public static function getRowMap($key=NULL)
    {
        if ($key) {
            return isset(self::$_keyRowMap[$key]) ? self::$_keyRowMap[$key] : NULL;
        } else {
            return self::$_keyRowMap;
        }
    }
public static function getRowMap ( $ key = NULL ) { if ( $ key ) { return isset ( self :: $ _keyRowMap [ $ key ] ) ? self :: $ _keyRowMap [ $ key ] : NULL ; } else { return self :: $ _keyRowMap ; } }
Get Row Number Map by key or all from the actived sheet

@param string|int $key Key set by addRow()
@return int|array Row number | Key-Coordinate array
Get Row Number Map by key or all from the actived sheet