f0928adbd8
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@122 fd906abe-77d9-0310-91a1-e0d9ade77398
79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
#
|
|
# Copyright (c) 2004 Helmut Merz helmutm@cy55.de
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program 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 General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
#
|
|
|
|
"""
|
|
Definition of the ResourceConstraint class.
|
|
|
|
$Id$
|
|
"""
|
|
|
|
from zope.interface import implements
|
|
|
|
from interfaces import IResourceConstraint
|
|
|
|
|
|
class ResourceConstraint(object):
|
|
|
|
implements(IResourceConstraint)
|
|
|
|
explanation = u''
|
|
constraintType = 'require'
|
|
referenceType = 'explicit'
|
|
referenceKey = None
|
|
|
|
|
|
def __init__(self):
|
|
self.referenceValues = []
|
|
|
|
|
|
def isResourceAllowed(self, resource, task=None):
|
|
if self.referenceType == 'parent':
|
|
for ref in self.referenceValues:
|
|
m = getattr(ref, self.referenceKey)
|
|
if resource in m():
|
|
return True
|
|
elif self.referenceType == 'explicit':
|
|
return resource in self.referenceValues
|
|
elif self.referenceType == 'checkmethod':
|
|
m = getattr(resource, self.referenceKey, None)
|
|
if m:
|
|
return m()
|
|
elif self.referenceType == 'selectmethod':
|
|
allowed = self.getAllowedResources(task=task)
|
|
return allowed and resource in allowed or False
|
|
return False
|
|
|
|
|
|
def getAllowedResources(self, candidates=None, task=None):
|
|
if self.referenceType == 'parent':
|
|
result = []
|
|
for ref in self.referenceValues:
|
|
m = getattr(ref, self.referenceKey)
|
|
result.extend(m())
|
|
return tuple(result)
|
|
elif self.referenceType == 'explicit':
|
|
return tuple(self.referenceValues)
|
|
elif self.referenceType == 'selectmethod':
|
|
m = getattr(self, self.referenceKey)
|
|
return m(candidates, task)
|
|
else:
|
|
if candidates is None:
|
|
return None
|
|
else:
|
|
return tuple([ r for r in candidates if self.isResourceAllowed(r, task) ])
|
|
|