+
−# -*- coding: UTF-8 -*-
+
−# Copyright (c) 2008 - 2012, Pascal Volk
+
−# See COPYING for distribution information.
+
−"""
+
−    VirtualMailManager.transport
+
−    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
−
+
−    Virtual Mail Manager's Transport class to manage the transport for
+
−    domains and accounts.
+
−"""
+
−
+
−from VirtualMailManager.pycompat import any
+
−
+
−_ = lambda msg: msg
+
−
+
−
+
−class Transport(object):
+
−    """A wrapper class that provides access to the transport table"""
+
−    __slots__ = ('_tid', '_transport', '_dbh')
+
−
+
−    def __init__(self, dbh, tid=None, transport=None):
+
−        """Creates a new Transport instance.
+
−
+
−        Either tid or transport must be specified. When both arguments
+
−        are given, tid will be used.
+
−
+
−        Keyword arguments:
+
−        dbh -- a pyPgSQL.PgSQL.connection
+
−        tid -- the id of a transport (int/long)
+
−        transport -- the value of the transport (str)
+
−
+
−        """
+
−        self._dbh = dbh
+
−        self._tid = 0
+
−        assert any((tid, transport))
+
−        if tid:
+
−            assert not isinstance(tid, bool) and isinstance(tid, (int, long))
+
−            self._load_by_id(tid)
+
−        else:
+
−            assert isinstance(transport, basestring)
+
−            self._transport = transport
+
−            self._load_by_name()
+
−
+
−    @property
+
−    def tid(self):
+
−        """The transport's unique ID."""
+
−        return self._tid
+
−
+
−    @property
+
−    def transport(self):
+
−        """The transport's value, ex: 'dovecot:'"""
+
−        return self._transport
+
−
+
−    def __eq__(self, other):
+
−        if isinstance(other, self.__class__):
+
−            return self._tid == other._tid
+
−        return NotImplemented
+
−
+
−    def __ne__(self, other):
+
−        if isinstance(other, self.__class__):
+
−            return self._tid != other._tid
+
−        return NotImplemented
+
−
+
−    def __str__(self):
+
−        return self._transport
+
−
+
−    def _load_by_id(self, tid):
+
−        """load a transport by its id from the database"""
+
−        dbc = self._dbh.cursor()
+
−        dbc.execute('SELECT transport FROM transport WHERE tid = %s', (tid,))
+
−        result = dbc.fetchone()
+
−        dbc.close()
+
−        if not result:
+
−            raise ValueError('Unknown transport id specified: %r' % tid)
+
−        self._transport = result[0]
+
−        self._tid = tid
+
−
+
−    def _load_by_name(self):
+
−        """Load a transport by its transport name from the database."""
+
−        dbc = self._dbh.cursor()
+
−        dbc.execute('SELECT tid FROM transport WHERE transport = %s',
+
−                    (self._transport,))
+
−        result = dbc.fetchone()
+
−        dbc.close()
+
−        if result:
+
−            self._tid = result[0]
+
−        else:
+
−            self._save()
+
−
+
−    def _save(self):
+
−        """Save the new transport in the database."""
+
−        dbc = self._dbh.cursor()
+
−        dbc.execute("SELECT nextval('transport_id')")
+
−        self._tid = dbc.fetchone()[0]
+
−        dbc.execute('INSERT INTO transport (tid, transport) VALUES (%s, %s)',
+
−                    (self._tid, self._transport))
+
−        self._dbh.commit()
+
−        dbc.close()
+
−
+
−del _