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"""CardConnectionObserver interface.

CardConnectionObserver is a base class for objects that are to be notified
upon CardConnection events.

__author__ = "http://www.gemalto.com"

Copyright 2001-2012 gemalto
Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com

This file is part of pyscard.

pyscard is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

pyscard is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with pyscard; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""

from __future__ import print_function
from smartcard.util import toHexString
from smartcard.Observer import Observer


# ReaderObserver interface
class CardConnectionObserver(Observer):
    """
    CardConnectionObserver is a base class for objects that are to be notified
    upon CardConnection events.
    """

    def update(self, cardconnection, cardconnectionevent):
        """Called upon CardConnection event.

        cardconnection:         the observed card connection object
        cardconnectionevent:    the CardConnectionEvent sent by the connection
        """
        pass


class ConsoleCardConnectionObserver(CardConnectionObserver):

    def update(self, cardconnection, ccevent):

        if 'connect' == ccevent.type:
            print('connecting to ' + cardconnection.getReader())

        elif 'disconnect' == ccevent.type:
            print('disconnecting from ' + cardconnection.getReader())

        elif 'command' == ccevent.type:
            print('> ' + toHexString(ccevent.args[0]))

        elif 'response' == ccevent.type:
            if [] == ccevent.args[0]:
                print('<  [] %02X %02X' % tuple(ccevent.args[-2:]))
            else:
                print('< ' +
                      toHexString(ccevent.args[0]) + " " +
                      "%02X %02X" % tuple(ccevent.args[-2:]))