cf291c3417
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@121 fd906abe-77d9-0310-91a1-e0d9ade77398
80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
#
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# Copyright (c) 2004 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Definition of the ResourceConstraint class.
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$Id$
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"""
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from zope.interface import implements
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from interfaces import IResourceConstraint
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class ResourceConstraint(object):
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implements(IResourceConstraint)
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explanation = u''
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constraintType = 'select'
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referenceType = 'explicit'
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referenceKey = None
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def __init__(self):
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self.referenceValues = []
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def isResourceAllowed(self, resource, task=None):
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if self.referenceType == 'parent':
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for ref in self.referenceValues:
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m = getattr(ref, self.referenceKey)
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if resource in m():
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return True
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return False
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elif self.referenceType == 'explicit':
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return resource in self.referenceValues
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elif self.referenceType == 'method':
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m = getattr(resource, self.referenceKey, None)
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if m:
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result = m()
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if result is None: # method needs additional task parameter
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result = m(task=task)
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return result
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else:
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return False
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else:
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return False
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def getAllowedResources(self, candidates=None, task=None):
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if self.referenceType == 'parent':
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result = []
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for ref in self.referenceValues:
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m = getattr(ref, self.referenceKey)
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result.extend(m())
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return tuple(result)
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elif self.referenceType == 'explicit':
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return tuple(self.referenceValues)
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else:
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if candidates is None:
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return None
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else:
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return tuple([ r for r in candidates if self.isResourceAllowed(r, task) ])
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