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########################################################################
#
# File Name: Context.py
#
#
"""
Context that is passed around for the current evaluation
WWW: http://4suite.org/4XSLT e-mail: support@4suite.org
Copyright (c) 1999-2001 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.org/COPYRIGHT for license and copyright information
"""
from Ft.Rdf import RDF_MS_BASE, RDF_SCHEMA_BASE
from Ft.Rdf import RdfException
import ResourceExpressions
class Context:
def __init__(self, driver, nsMapping, varBindings, scope=None):
self.driver = driver
self.nsMapping = nsMapping
self.varBindings = varBindings
self.current = None
self.cachedSuperProps = None
self.scope = scope
return
def isTransitive(self, property):
if property in TRANSITIVE_BY_RULE:
return 1
return 0
def clone(self):
new_con = Context(self.driver, self.nsMapping.copy(),
self.varBindings.copy(), self.scope)
new_con.current = self.current
if self.cachedSuperProps is not None:
new_con.cachedSuperProps = self.cachedSuperProps.copy()
return new_con
def getCachedSuperProps(self):
from Ft.Rdf.Parsers.Versa import RDF_TYPE_PROP, RDF_SUBCLASSOF_PROP, RDF_SUBPROPOF_PROP
if self.cachedSuperProps is None:
self.cachedSuperProps = ResourceExpressions.GetRelations(
None, RDF_SUBPROPOF_PROP, self, 1, 0
)
return self.cachedSuperProps
def ContextFromKeyWord(kw):
"""Create a new context for processing, allowed params:
model = an instance of an Ft.Rdf.Model.Model
driver = an instance of Ft.Rdf.Drivers.*
nsMapping = a dictionary that map prefix to namespace
varBindings = a dictionary. keys are a tuple of (namepsace,localName) and values are any allowed data type
"""
defaultNs = {'rdf':RDF_MS_BASE,
'rdfs':RDF_SCHEMA_BASE,
}
driver=None
nsMapping = defaultNs
varBindings = {}
scope = None
for name, value in kw.items():
if name == 'driver':
driver = value
elif name == 'model':
driver = value._driver
elif name == 'nsMapping':
nsMapping = value.copy()
nsMapping.update(defaultNs)
elif name == 'varBindings':
varBindings = value
elif name == 'scope':
scope = value
else:
raise RdfException(FtRdfException.INVALID_ARGUMENT, name=name)
if driver is None:
raise RdfException(FtRdfException.MISSING_DRIVER)
return Context(driver, nsMapping, varBindings, scope)
import DataTypes
TRANSITIVE_BY_RULE = [DataTypes.Resource(RDF_SCHEMA_BASE + 'subPropertyOf'),
DataTypes.Resource(RDF_SCHEMA_BASE + 'subClassOf')]
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