Accesscodes
***********

:doctest:

We can create accesscodes:

    >>> from waeup.sirp.accesscodes.accesscodes import AccessCode
    >>> ac = AccessCode(0, 'APP', 12, '0123456789', 12.12)
    >>> ac.representation
    'APP-12-0123456789'

We can create batches. Here we create a batch of three entries, with a
cost of 12.12 per code, the batch prefix 'APP', batch number 12,
creator ID 'Fred' and some arbitrary creation date:

    >>> import datetime
    >>> from waeup.sirp.accesscodes.accesscodes import AccessCodeBatch
    >>> batch = AccessCodeBatch(
    ...   datetime.datetime(2009, 12, 23), 'Fred', 10, 'APP', 12.12, 3)

The main point about a batch is that it can act as an iterator over
the generated access codes. The codes are generated on-the-fly when
iterating over the batch for the first time:

    >>> ac_codes = [x.representation for x in batch]
    >>> ac_codes
    ['APP-10-...', 'APP-10-...', 'APP-10-...']

When we ask for the access codes again, we will get equal
entries. 'Equal' means: we will get same representations, but not
neccessarily the same objects:

    >>> ac_codes2 = [x.representation for x in batch]
    >>> ac_codes2 == ac_codes
    True

    >>> ac_codes[0] == ac_codes2[0]
    True

    >>> ac_codes[0] is ac_codes2[0]
    False

`Accesscode` and `AccessCodeBatch` classes implement the respective
interfaces:

    >>> from waeup.sirp.accesscodes.accesscodes import (
    ...   AccessCode, AccessCodeBatch)
    >>> from waeup.sirp.accesscodes.interfaces import(
    ...   IAccessCode, IAccessCodeBatch)
    >>> from zope.interface.verify import verifyClass
    >>> verifyClass(IAccessCode, AccessCode)
    True

    >>> verifyClass(IAccessCodeBatch, AccessCodeBatch)
    True