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Source code for kivy.storage.jsonstore

'''
JSON store
==========

A :mod:`Storage <kivy.storage>` module used to save/load key-value pairs from
a json file.
'''

__all__ = ('JsonStore', )


import errno
from os.path import exists, abspath, dirname
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 key-value pairs. See the :mod:`kivy.storage` module documentation for more information. ''' def __init__(self, filename, indent=None, sort_keys=False, **kwargs): self.filename = filename self.indent = indent self.sort_keys = sort_keys self._data = {} self._is_changed = True super(JsonStore, self).__init__(**kwargs) def store_load(self): if not exists(self.filename): folder = abspath(dirname(self.filename)) if not exists(folder): not_found = IOError( "The folder '{}' doesn't exist!" "".format(folder) ) not_found.errno = errno.ENOENT raise not_found return with open(self.filename) as fd: data = fd.read() if len(data) == 0: return self._data = loads(data) def store_sync(self): if not self._is_changed: return with open(self.filename, 'w') as fd: dump( self._data, fd, indent=self.indent, sort_keys=self.sort_keys ) 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()