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Viewing changes to plainbox/plainbox/impl/unit/validators.py

  • Committer: Daniel Manrique
  • Author(s): Zygmunt Krynicki
  • Date: 2015-03-27 20:47:36 UTC
  • mfrom: (3626.1.1 launchpad/more-pods)
  • Revision ID: daniel_manrique-20150327204736-sr2plieces35h5bk
"automatic merge of lp:~zyga/checkbox/more-pods/ by tarmac [r=roadmr][bug=][author=zyga]"

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plainbox/plainbox/impl/unit/validators.py
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from plainbox.i18n import gettext as _
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from plainbox.i18n import ngettext
 
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from plainbox.impl import pod
 
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from plainbox.abc import IProvider1
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from plainbox.impl.unit import get_accessed_parameters
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from plainbox.impl.validation import Issue
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from plainbox.impl.validation import Problem
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    return str(field).replace('-', '_')
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class UnitValidationContext:
 
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class UnitValidationContext(pod.POD):
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    """
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    Helper class for validating units in a bigger context
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    1) to allow a the validated object to see "everything" (other units)
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    2) to allow validators to share temporary data structures
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       and to prevent O(N**2) complexity of some checks.
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    :attr provider_list:
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        A list of Provider1 objects
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    """
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    def __init__(self, provider_list):
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        """
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        Initialize a new validation context
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        :param provider_list:
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            A list of Provider1 objects
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        """
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        self._provider_list = provider_list
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        self._shared_cache = {}
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    @property
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    def provider_list(self):
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        return self._provider_list
 
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    provider_list = pod.Field(
 
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        "list of all the providers", list, pod.MANDATORY,
 
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        assign_filter_list=[pod.typed, pod.typed.sequence(IProvider1)])
 
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    shared_cache = pod.Field(
 
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        "cached computations", dict, initial_fn=dict,
 
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        assign_filter_list=[pod.typed])
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    def compute_shared(self, cache_key, func, *args, **kwargs):
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        """
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            The caller is responsible for ensuring that ``args`` and ``kwargs``
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            match the `cache_key` each time this function is called.
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        """
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        if cache_key not in self._shared_cache:
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            self._shared_cache[cache_key] = func(*args, **kwargs)
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        return self._shared_cache[cache_key]
 
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        if cache_key not in self.shared_cache:
 
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            self.shared_cache[cache_key] = func(*args, **kwargs)
 
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        return self.shared_cache[cache_key]
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class UnitFieldIssue(Issue):