def _as_cfacet ( self, original_facet ):
""" Returns the low-level C-based facet for this FacetValue.
"""
if self.default is not None:
facet = CFacet( 0 )
facet.clone( original_facet )
if original_facet.__dict__ is not None:
facet.__dict__ = original_facet.__dict__.copy()
facet.default_value( 7, ( self.default, self.args, self.kw ) )
elif self.type is not None:
type = self.type
try:
rc = issubclass( type, FacetType )
except:
rc = False
if rc:
type = type( *self.args, **self.kw )
if not isinstance( type, FacetType ):
raise FacetError(
("The 'type' attribute of a FacetValue instance must be a "
"FacetType instance or subclass, but a value of %s was "
"specified.") % self.facet
)
self._cfacet = facet = type.as_cfacet()
facet.value_allowed( True )
elif self.delegate is None:
return None
else:
if self.name == '':
raise FacetError(
"You must specify a non-empty string value for the 'name' "
"attribute when using the 'delegate' facet of a FacetValue "
"instance."
)
metadata = {
'type': 'property',
'_facet_value': self,
'transient': True
}
getter = self._delegate_getter
setter = self._delegate_setter
validate = None
self.add_facet( 'value', Event() )
self.delegate.on_facet_set( self._delegate_modified,
self.name + '[]' )
facet = self._property_facet( getter, setter, validate, metadata )
return facet
def as_cfacet ( self, original_facet ):
""" Returns the low-level C-based facet for this FacetValue.
"""
notifiers = original_facet._notifiers( 0 )
if self._cfacet is not None:
if (notifiers is None) or (len( notifiers ) == 0):
return self._cfacet
facet = CFacet( 0 )
facet.clone( self._cfacet )
else:
facet = self._as_cfacet( original_facet )
if ((facet is not None) and
(notifiers is not None) and
(len( notifiers ) > 0)):
facet._notifiers( 1 ).extend( notifiers )
return facet
def _property_facet ( self, getter, setter, validate, metadata ):
""" Returns a properly constructed 'property' facet.
"""
n = 0
if validate is not None:
n = _arg_count( validate )
facet = CFacet( 4 )
facet.property(
getter, _arg_count( getter ),
setter, _arg_count( setter ),
validate, n
)
facet.value_allowed( True )
facet.value_property( True )
facet.__dict__ = metadata
return facet
