#!/usr/bin/env python

# -*- coding: UTF-8 -*-

# Copyright 2008 VEB IT

# See COPYING for distribution information.

# $Id$

"""Virtual Mail Manager's MailLocation class to manage the mail_location

for accounts."""

from constants.VERSION import VERSION

__author__ = 'Pascal Volk <p.volk@veb-it.de>'

__version__ = VERSION

__revision__ = 'rev '+'$Rev$'.split()[1]

__date__ = '$Date$'.split()[1]

from Exceptions import VMMMailLocationException as MLE

import constants.ERROR as ERR

class MailLocation:

    """A wrapper class thats provide access to the maillocation table"""

    def __init__(self, dbh, mid=None, maillocation=None):

        """Creates a new MailLocation instance.

        Either mid or maillocation must be specified.

        Keyword arguments:

        dbh -- a pyPgSQL.PgSQL.connection

        mid -- the id of a maillocation (long)

        maillocation -- the value of the maillocation (str)

        """

        self._dbh = dbh

        if mid is None and maillocation is None:

            raise MLE(('Either mid or maillocation must be specified.',

                ERR.MAILLOCATION_INIT))

        elif mid is not None:

            try:

                self.__id = long(mid)

            except ValueError:

                raise MLE(('mid must be an int/long.', ERR.MAILLOCATION_INIT))

            self._loadByID()

        else:

            self.__maillocation = maillocation

            self._loadByName()

    def _loadByID(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT maillocation FROM maillocation WHERE mid = %s',

                self.__id)

        result = dbc.fetchone()

        dbc.close()

        if result is not None:

            self.__maillocation = result[0]

        else:

            raise MLE(('Unknown mid specified.', ERR.UNKNOWN_MAILLOCATION_ID))

    def _loadByName(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT mid FROM maillocation WHERE maillocation = %s',

                self.__maillocation)

        result = dbc.fetchone()

        dbc.close()

        if result is not None:

            self.__id = result[0]

        else:

            self._save()

    def _save(self):

        dbc = self._dbh.cursor()

        dbc.execute("SELECT nextval('maillocation_id')")

        self.__id = dbc.fetchone()[0]

        dbc.execute('INSERT INTO maillocation(mid,maillocation) VALUES(%s,%s)',

                self.__id, self.__maillocation)

        self._dbh.commit()

        dbc.close()

    def getID(self):

        """Returns the unique ID of the maillocation."""

        return self.__id

    def getMailLocation(self):

        """Returns the value of maillocation, ex: 'Maildir'"""

        return self.__maillocation