import xml.etree.ElementTree as XMLParser


class XMLSetup (object):
    """XML Setup Parser"""
    __tree = None                   # Parser
    __dbType = None                 # database connection required: PgSQLConnection
    __dbConnectionRaw = None        # Connection string in raw
    __dbConnectionStr = None        # Connection string to use in sql object connection

    def __init__(self, filename):
        """Parse the file in the constructor"""
        self.__tree = XMLParser.parse(filename)

    def __del__(self):
        """Destructor do nothing"""
        pass

    def getdbConnectionStr(self):
        """XML to database connection string"""
        if self.__dbConnectionRaw is not None:
            return self.__dbConnectionRaw

        for element in self.__tree.iter('db'):
            self.__dbConnectionRaw = element.attrib
            self.__dbType = self.__dbConnectionRaw['type']
            if self.__dbType == "PgSQLConnection":
                self.__dbConnectionStr = self.getPostgresConnectionStr()
            return self.__dbConnectionStr

        return None

    def getPostgresConnectionStr(self):
        """aaaaa"""
        str = self.__dbConnectionRaw
        del str['type']
        return str

    def getMysqlConnectionStr (self):
        """aaaaa"""
        pass

    def getBoard(self, key, default):
        for element in self.__tree.iter('board'):
            if key in element.attrib:
                return element.attrib[key]
        return default