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# This file is part of rhizi, a collaborative knowledge graph editor.
# Copyright (C) 2014-2015 Rhizi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import base64
import gzip
import json
class RZCommit():
"""
Rhizi Commit object
Currently this object is substituted by either a diff object, this currently
acts as a model stub.
"""
@staticmethod
def diff_obj_from_blob(blob):
"""
@return json.loads(gzip_decompress(base64_decode(blob)))
"""
blob_gzip = base64.decodestring(blob)
blob = gzip.zlib.decompress(blob_gzip)
return json.loads(blob)
@staticmethod
def blob_from_diff_obj(obj):
"""
@return: blob = base64(gzip(json.dumps(obj)))
"""
obj_str = json.dumps(obj)
blob_gzip = gzip.zlib.compress(obj_str)
blob_base64 = base64.encodestring(blob_gzip)
return blob_base64
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)
class RZDoc():
def __init__(self, rzdoc_name=None):
self.id = None # set upon DB commit
self.name = rzdoc_name
def __eq__(self, other):
if not isinstance(other, RZDoc): return False
assert self.id != None and other.id != None
return self.id == other.id
def __hash__(self):
assert self.id != None
return self.id.__hash__()
def __str__(self):
return 'rzdoc: name: %s' % (self.name)
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