Commit 891a0f73 authored by Evan Simpson's avatar Evan Simpson

Add SafeMapping class, for use when mappings (or MultiMappings) need to be...

Add SafeMapping class, for use when mappings (or MultiMappings) need to be exposed to restricted code.
parent b853c3f5
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__doc__='''Read-only Mapping class based on MultiMapping
$Id: SafeMapping.py,v 1.1 2001/05/08 18:15:36 evan Exp $'''
__version__='$Revision: 1.1 $'[11:-2]
from MultiMapping import MultiMapping
_marker = []
class SafeMapping(MultiMapping):
'''Mapping with security declarations and limited method exposure.
Since it subclasses MultiMapping, this class can be used to wrap
one or more mapping objects. Restricted Python code will not be
able to mutate the SafeMapping or the wrapped mappings, but will be
able to read any value.
'''
__allow_access_to_unprotected_subobjects__ = 1
push = pop = None
def _push(self, ob):
MultiMapping.push(self, ob)
def _pop(self, *args):
if args:
return apply(MultiMapping.pop, (self,) + args)
else:
return MultiMapping.pop(self)
def has_get(self, key):
v = self.get(key, _marker)
if v is _marker:
return 0, None
else:
return 1, v
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