def enforceInstructionConstraints(event):
"""Enforce instruction constraints (IBeforeRelationshipEvent subscriber).
"""
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URIInstruction:
return
if ((event.role1, event.role2) != (URIInstructor, URISection)
and (event.role1, event.role2) != (URISection, URIInstructor)):
raise InvalidRelationship('Instruction must have one instructor'
' and one section.')
if not ISection.providedBy(event[URISection]):
raise InvalidRelationship('Sections must provide ISection.')
def enforceInstructionConstraints(event):
"""Enforce instruction constraints (IBeforeRelationshipEvent subscriber).
"""
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URIInstruction:
return
if ((event.role1, event.role2) != (URIInstructor, URISection) and
(event.role1, event.role2) != (URISection, URIInstructor)):
raise InvalidRelationship('Instruction must have one instructor'
' and one section.')
if not ISection.providedBy(event[URISection]):
raise InvalidRelationship('Sections must provide ISection.')
def enforceCourseSectionConstraint(event):
"""Each CourseSections relationship requires one ICourse and one ISection
"""
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URICourseSections:
return
if ((event.role1, event.role2) != (URICourse, URISectionOfCourse) and
(event.role1, event.role2) != (URISectionOfCourse, URIInstructor)):
raise InvalidRelationship('CourseSections must have one course'
' and one section.')
if not ISection.providedBy(event[URISectionOfCourse]):
raise InvalidRelationship('Sections must provide ISection.')
if not ICourse.providedBy(event[URICourse]):
raise InvalidRelationship('Course must provide ICourse.')
def enforceCourseSectionConstraint(event):
"""Each CourseSections relationship requires one ICourse and one ISection
"""
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URICourseSections:
return
if ((event.role1, event.role2) != (URICourse, URISectionOfCourse)
and (event.role1, event.role2) !=
(URISectionOfCourse, URIInstructor)):
raise InvalidRelationship('CourseSections must have one course'
' and one section.')
if not ISection.providedBy(event[URISectionOfCourse]):
raise InvalidRelationship('Sections must provide ISection.')
if not ICourse.providedBy(event[URICourse]):
raise InvalidRelationship('Course must provide ICourse.')
def enforceMembershipConstraints(event):
"""Enforce membership constraints (IBeforeRelationshipEvent subscriber)."""
# XXX look through all the IBeforeRelationshipEvent subscribers,
# if there are any, and convert them to something different.
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URIMembership:
return
if ((event.role1, event.role2) != (URIMember, URIGroup) and
(event.role1, event.role2) != (URIGroup, URIMember)):
raise InvalidRelationship('Membership must have one member'
' and one group.')
if IBaseResource.providedBy(event[URIMember]):
raise InvalidRelationship("Resources cannot be members of a group.")
if not IGroup.providedBy(event[URIGroup]):
raise InvalidRelationship('Groups must provide IGroup.')
if IGroup.providedBy(event[URIMember]):
raise InvalidRelationship("Groups cannot be members of a group anymore.")
if isTransitiveMember(event[URIGroup], event[URIMember]):
raise InvalidRelationship('No cycles are allowed.')
def enforceMembershipConstraints(event):
"""Enforce membership constraints (IBeforeRelationshipEvent subscriber)."""
# XXX look through all the IBeforeRelationshipEvent subscribers,
# if there are any, and convert them to something different.
if not IBeforeRelationshipEvent.providedBy(event):
return
if event.rel_type != URIMembership:
return
if ((event.role1, event.role2) != (URIMember, URIGroup)
and (event.role1, event.role2) != (URIGroup, URIMember)):
raise InvalidRelationship('Membership must have one member'
' and one group.')
if IBaseResource.providedBy(event[URIMember]):
raise InvalidRelationship("Resources cannot be members of a group.")
if not IGroup.providedBy(event[URIGroup]):
raise InvalidRelationship('Groups must provide IGroup.')
if IGroup.providedBy(event[URIMember]):
raise InvalidRelationship(
"Groups cannot be members of a group anymore.")
if isTransitiveMember(event[URIGroup], event[URIMember]):
raise InvalidRelationship('No cycles are allowed.')
