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Viewing changes to src/lazr/lifecycle/snapshot.py

  • Committer: Brad Crittenden
  • Date: 2009-12-04 15:37:40 UTC
  • mfrom: (34.1.4 snapshot)
  • Revision ID: bac@canonical.com-20091204153740-h8bq1wk16guxlfk7
Tags: 1.1
[r=gary_poster][bug=488762] Create 'doNotSnapshot' and exclude fields so marked from the snapshot.

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src/lazr/lifecycle/snapshot.py
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__metaclass__ = type
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__all__ = ['SnapshotCreationError',
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           'Snapshot',
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           ]
 
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__all__ = [
 
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    'doNotSnapshot',
 
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    'SnapshotCreationError',
 
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    'Snapshot',
 
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    ]
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from zope.component import queryAdapter
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from zope.interface.interfaces import IInterface
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from zope.interface import directlyProvides
 
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from zope.interface import alsoProvides, directlyProvides
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from zope.schema.interfaces import IField
 
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from zope.schema import Field
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from zope.security.proxy import removeSecurityProxy
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from lazr.lifecycle.interfaces import ISnapshotValueFactory
 
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from lazr.lifecycle.interfaces import (
 
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    IDoNotSnapshot, ISnapshotValueFactory)
 
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_marker = object()
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def doNotSnapshot(field):
 
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    """Simple wrapper method to provide `IDoNotSnapshot`."""
 
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    alsoProvides(field, IDoNotSnapshot)
 
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    return field
 
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class SnapshotCreationError(Exception):
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    """Something went wrong while creating a snapshot."""
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            for iface in providing:
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                for name in iface.names(all=True):
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                    field = iface[name]
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                    if IField.providedBy(field):
 
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                    if (IField.providedBy(field) and
 
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                        not IDoNotSnapshot.providedBy(field)):
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                        names.add(name)
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        for name in names: