ErrorChecker.py :  » Mobile » pyscard » pyscard-1.6.10 » smartcard » sw » Python Open Source

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Python Open Source » Mobile » pyscard 
pyscard » pyscard 1.6.10 » smartcard » sw » ErrorChecker.py
"""Base class for status word error checkers.

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

Copyright 2001-2010 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
"""

class ErrorChecker:
    """Base class for status word error checking strategies.

    Error checking strategies are chained into an ErrorCheckingChain to implement
    a Chain of Responsibility. Each strategy in the chain is called until an error
    is  detected. The strategy raises a smartcard.sw.SWException exception when an
    error is detected.

    Implementation derived from Bruce Eckel, Thinking in Python. The ErrorCheckingChain
    implements the Chain Of Responsibility design pattern.
    """
    def __call__( data, sw1, sw2 ):
        """Called to test data, sw1 and sw2 for error.

        data:       apdu response data
        sw1, sw2:   apdu data status words

        Derived classes must raise a smartcard.sw.SWException upon error."""
        pass
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