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#!/usr/bin/env python

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

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

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

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#

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

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#

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# See COPYING file for copyrights details.

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#

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

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

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

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

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#

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

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

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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

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

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

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# Package initialisation

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from os import listdir, path

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_base_path = path.split(__file__)[0]

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def _GetLocalConnectorClassFactory(name):

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

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connectors = {name:_GetLocalConnectorClassFactory(name)

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                  for name in listdir(_base_path)

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

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                          and not name.startswith("__")}

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def ConnectorFactory(uri, confnodesroot):

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    """

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    Return a connector corresponding to the URI

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    or None if cannot connect to URI

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    """

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

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    if servicetype == "LOCAL":

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        # Local is special case

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        # pyro connection to local runtime

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        # started on demand, listening on random port

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        servicetype = "PYRO"

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        runtime_port = confnodesroot.AppFrame.StartLocalRuntime(

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            taskbaricon=True)

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

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    elif servicetype in connectors:

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        pass

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

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        servicetype = servicetype[:-1]

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    else:

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        return None

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    # import module according to uri type

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    connectorclass = connectors[servicetype]()

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    return connectorclass(uri, confnodesroot)