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class Link():
"""
documentation anchor - this class currently carries no implementation
and only acts as a documentation anchor
link['__src'] - meta attribute for link source object
link['__dst'] - meta attribute for link destination object
"""
def __init__(self, src=None, dst=None):
assert False, 'currently unused'
class Link_Ptr(dict):
"""
link['__src_id'] - meta attribute for link source id
link['__dst_id'] - meta attribute for link destination id
"""
def __init__(self, src_id=None, dst_id=None):
assert None != src_id or None != dst_id
self['__src_id'] = src_id
self['__dst_id'] = dst_id
@property
def src_id(self):
return self['__src_id']
@property
def dst_id(self):
return self['__dst_id']
@staticmethod
def link_ptr(src_id=None, dst_id=None):
"""
init from src_id or dst_id attributes - at least one must be provided
"""
return Link.Link_Ptr(src_id, dst_id)
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