1

#!/usr/bin/env python

     2

# -*- coding: utf-8 -*-

     3

     4

# This file is part of Beremiz, a Integrated Development Environment for

     5

# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

     6

#

     7

# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

     9

#

    10

# See COPYING file for copyrights details.

    11

#

    12

# This program is free software; you can redistribute it and/or

    13

# modify it under the terms of the GNU General Public License

    14

# as published by the Free Software Foundation; either version 2

    15

# of the License, or (at your option) any later version.

    16

#

    17

# This program is distributed in the hope that it will be useful,

    18

# but WITHOUT ANY WARRANTY; without even the implied warranty of

    19

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    20

# GNU General Public License for more details.

    21

#

    22

# You should have received a copy of the GNU General Public License

    23

# along with this program; if not, write to the Free Software

    24

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    25

    26

# Package initialisation

    27

    28

from os import listdir, path

    30

    32

    33

    34

def _GetLocalConnectorClassFactory(name):

    35

    return lambda: getattr(__import__(name, globals(), locals()), name + "_connector_factory")

    36

    37

connectors = {name:_GetLocalConnectorClassFactory(name)

    38

                  for name in listdir(_base_path)

    39

                      if path.isdir(path.join(_base_path, name))

    40

                          and not name.startswith("__")}

    41

    42

    43

def ConnectorFactory(uri, confnodesroot):

    44

    """

    45

    Return a connector corresponding to the URI

    46

    or None if cannot connect to URI

    47

    """

    48

    servicetype = uri.split("://")[0].upper()

    49

    if servicetype == "LOCAL":

    50

        # Local is special case

    51

        # pyro connection to local runtime

    52

        # started on demand, listening on random port

    53

        servicetype = "PYRO"

    54

        runtime_port = confnodesroot.AppFrame.StartLocalRuntime(

    55

            taskbaricon=True)

    56

        uri = "PYROLOC://127.0.0.1:" + str(runtime_port)

    57

    elif servicetype in connectors:

    58

        pass

    59

    elif servicetype[-1] == 'S' and servicetype[:-1] in connectors:

    60

        servicetype = servicetype[:-1]

    61

    else:

    62

        return None

    63

    64

    # import module according to uri type

    65

    connectorclass = connectors[servicetype]()

    66

    return connectorclass(uri, confnodesroot)