"""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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