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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 library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library 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 GNU

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#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

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

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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from LPCProto import *

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class LPCObject():

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    def __init__(self, confnodesroot, comportstr):

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        self.TransactionLock = Lock()

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        self.PLCStatus = "Disconnected"

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        self.confnodesroot = confnodesroot

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        self.PLCprint = confnodesroot.logger.writeyield

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        self._Idxs = []

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        try:

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            self.connect(comportstr)

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        except Exception,e:

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            self.confnodesroot.logger.write_error(str(e)+"\n")

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            self.SerialConnection = None

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            self.PLCStatus = "Disconnected"

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    def HandleSerialTransaction(self, transaction):

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        res = None

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        disconnected=False

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        failure=None

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        self.TransactionLock.acquire()

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        if self.SerialConnection is not None:

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            try:

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                self.PLCStatus, res = \

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                    self.SerialConnection.HandleTransaction(transaction)

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            except LPCProtoError,e:

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                disconnected=True

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                if self.SerialConnection is not None:

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                    self.SerialConnection.close()

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                    self.SerialConnection = None

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                self.PLCStatus = "Disconnected"

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            except Exception,e:

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                failure = str(e)

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        self.TransactionLock.release()

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        if disconnected:

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            self.confnodesroot.logger.write(_("PLC disconnected\n"))

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        if failure is not None:

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            self.confnodesroot.logger.write_warning(failure+"\n")

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        return res

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    def StartPLC(self, debug=False):

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        raise LPCProtoError("Not implemented")

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    def StopPLC(self):

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        raise LPCProtoError("Not implemented")

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    def GetPLCstatus(self):

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        raise LPCProtoError("Not implemented")

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    def NewPLC(self, md5sum, data, extrafiles):

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        raise LPCProtoError("Not implemented")

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    def MatchMD5(self, MD5):

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        raise LPCProtoError("Not implemented")

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    def SetTraceVariablesList(self, idxs):

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        raise LPCProtoError("Not implemented")

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    def GetTraceVariables(self):

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        raise LPCProtoError("Not implemented")

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