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# Software Management Providers
#
# Copyright (C) 2012-2014 Red Hat, Inc. All rights reserved.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Authors: Michal Minar <miminar@redhat.com>
#
"""
Core functionality of particular providers.
Each provider having functionality useful to others has a submodule
in this subpackage with the same name except for LMI_ prefix.
"""
import pywbem
from lmi.providers import cmpi_logging
@cmpi_logging.trace_function
def generate_references(
env,
object_name,
model,
filter_result_class_name,
filter_role,
filter_result_role,
keys_only,
handlers):
"""
Function for generating references to object_name. It's supposed
to be used directly from references method of provider classes.
@param handlers is a list of tuples:
[ (role, class_name, handler), ... ]
where handler is a function, that will be called for matching
parameters, yielding instance(s/names). It accepts arguments:
env, object_name, model, keys_only.
"""
if not isinstance(object_name, pywbem.CIMInstanceName):
raise TypeError("object_name must be a CIMInstanceName")
if not isinstance(model, pywbem.CIMInstance):
raise TypeError("model must be a CIMInstance")
ch = env.get_cimom_handle()
model.path.update(dict((t[0], None) for t in handlers))
try:
for i, (role, clsname, handler) in enumerate(handlers):
if ( ( filter_role
and filter_role.lower() != role.lower())
or not ch.is_subclass(object_name.namespace,
sub=object_name.classname,
super=clsname)):
continue
other_results = list((htuple[0], htuple[1]) for htuple in (
handlers[:i] + handlers[i+1:]))
for res_role, res_clsname in other_results:
if ( ( not filter_result_role
or filter_result_role.lower() == res_role.lower())
and (not filter_result_class_name or ch.is_subclass(
object_name.namespace,
sub=filter_result_class_name,
super=res_clsname))):
break
else:
continue
# matches filters
for obj in handler(env, object_name, model, keys_only):
yield obj
except pywbem.CIMError as exc:
if exc.args[0] != pywbem.CIM_ERR_NOT_FOUND:
raise
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