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# Copyright 2016 Lars Wirzenius
#
# 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import sys
import json
import obnamlib
class MeliaeReader(object):
def __init__(self):
self._objs = {} # ref to object
self._closures = {} # ref to list of refs
def __iter__(self):
return iter(self._objs.values())
def __contains__(self, ref):
return ref in self._objs
def __len__(self):
return len(self._objs)
def read(self, filename):
with open(filename) as f:
for line in f:
obj = json.loads(line)
self._objs[obj['address']] = obj
self.compute_closures()
def get_total_size(self):
return self.get_size(self._objs.values())
def get_size(self, objs):
return sum(o['size'] for o in objs)
def get_types(self):
return set(o['type'] for o in self)
def get_obnam_types(self): # pragma: no cover
return set(
o['type']
for o in self
if hasattr(obnamlib, o['type'])
)
def get_objs_of_type(self, typename):
return [o for o in self if o['type'] == typename]
def compute_closures_foo(self): # pragma: no cover
all_refs = self._objs.keys()
# Set all closures to be just the object itself.
for ref in all_refs:
self._closures[ref] = set([ref])
# Find new objects that can be reached from current closures.
# Repeat until no more.
added = True
growing_refs = list(all_refs)
while growing_refs:
sys.stderr.write(
'computing closures for {} objs\n'.format(len(growing_refs)))
growing2 = set()
for ref in growing_refs:
if self.add_to_closure(ref):
growing2.add(ref)
growing_refs = growing2
assert set(self._objs.keys()) == set(self._closures.keys())
def add_to_closure(self, ref): # pragma: no cover
grown = False
closure = self._closures[ref]
children = [self.get_object(r) for r in closure]
for child in children:
delta = set(child['refs']).difference(closure)
if delta:
for r in delta:
if r in self:
closure.add(r)
grown = True
return grown
def compute_closures(self):
all_refs = self._objs.keys()
for i, ref in enumerate(all_refs):
sys.stderr.write('{} closures left\n'.format(
len(self) - len(self._closures)))
closure = self._simple_get_closure(ref)
for j in range(0, i):
j_ref = all_refs[j]
if self._closures[j_ref] == closure:
closure = self._closures[j_ref]
break
self._closures[ref] = closure
def _simple_get_closure(self, ref): # pragma: no cover
closure = set()
todo = set([ref])
all_refs = set(self._objs.keys())
while todo:
ref = todo.pop()
assert ref not in closure
closure.add(ref)
obj = self.get_object(ref)
child_refs = set(obj['refs'])
child_refs = child_refs.intersection(all_refs)
child_refs = child_refs.difference(closure)
todo.update(child_refs)
return closure
def get_closure(self, obj, indent=0):
ref = obj['address']
assert ref in self._closures, 'ref {} not in _closures'.format(ref)
return [self.get_object(r) for r in self._closures[ref]]
def get_object(self, ref):
if ref in self:
return self._objs[ref]
raise Exception('No object with address {}'.format(ref))
def get_closure_of_type(self, typename):
sys.stderr.write('get_closure_of_type({})\n'.format(typename))
type_closure = {}
for obj in self.get_objs_of_type(typename):
for o in self.get_closure(obj, indent=1):
type_closure[o['address']] = o
return type_closure.values()
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