Table Of Contents
Source code for kivy.storage.jsonstore
'''
JSON store
==========
Can be used to save/load key-value pairs from a json file.
'''
__all__ = ('JsonStore', )
from os.path import exists
from kivy.compat import iteritems
from kivy.storage import AbstractStore
from json import loads, dump
[docs]class JsonStore(AbstractStore):
'''Store implementation using a json file for storing the keys-value pairs.
See the :mod:`kivy.storage` module documentation for more information.
'''
def __init__(self, filename, **kwargs):
self.filename = filename
self._data = {}
self._is_changed = True
super(JsonStore, self).__init__(**kwargs)
def store_load(self):
if not exists(self.filename):
return
with open(self.filename) as fd:
data = fd.read()
if len(data) == 0:
return
self._data = loads(data)
def store_sync(self):
if self._is_changed is False:
return
with open(self.filename, 'w') as fd:
dump(self._data, fd)
self._is_changed = False
def store_exists(self, key):
return key in self._data
def store_get(self, key):
return self._data[key]
def store_put(self, key, value):
self._data[key] = value
self._is_changed = True
return True
def store_delete(self, key):
del self._data[key]
self._is_changed = True
return True
def store_find(self, filters):
for key, values in iteritems(self._data):
found = True
for fkey, fvalue in iteritems(filters):
if fkey not in values:
found = False
break
if values[fkey] != fvalue:
found = False
break
if found:
yield key, values
def store_count(self):
return len(self._data)
def store_keys(self):
return self._data.keys()