Package smartcard :: Package sw :: Module ErrorCheckingChain :: Class ErrorCheckingChain

Class ErrorCheckingChain

The error checking chain is a list of response apdu status word (sw1, sw2) error check strategies. Each strategy in the chain is called until an error is detected. A smartcard.sw.SWException exception is raised when an error is detected. No exception is raised if no error is detected.

Implementation derived from Bruce Eckel, Thinking in Python. The ErrorCheckingChain implements the Chain Of Responsibility design pattern.

Instance Methods

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__init__(self, chain, strategy)
constructor.

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next(self)
Returns next error checking strategy.

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addFilterException(self, exClass)
Add an exception filter to the error checking chain.

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end(self)
Returns True if this is the end of the error checking strategy chain.

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__call__(self, data, sw1, sw2)
Called to test data, sw1 and sw2 for error on the chain.

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Method Details

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init(self, chain, strategy)
(Constructor)

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constructor. Appends a strategy to the ErrorCheckingChain chain.

addFilterException(self, exClass)

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Add an exception filter to the error checking chain.

Parameters:

exClass - the exception to exclude, e.g. smartcard.sw.SWExceptions.WarningProcessingException A filtered exception will not be raised when the sw1,sw2 conditions that would raise the excption are met.

Class ErrorCheckingChain

__init__(self, chain, strategy) (Constructor)

addFilterException(self, exClass)

init(self, chain, strategy)
(Constructor)