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Source code for kivy.storage.dictstore

'''
Dictionary store
=================

Use a Python dictionary as a store.
'''

__all__ = ('DictStore', )

try:
    import cPickle as pickle
except ImportError:
    import pickle

import errno
from os.path import exists, abspath, dirname
from kivy.compat import iteritems
from kivy.storage import AbstractStore


[docs]class DictStore(AbstractStore): '''Store implementation using a pickled `dict`. See the :mod:`kivy.storage` module documentation for more information. ''' def __init__(self, filename, data=None, **kwargs): if isinstance(filename, dict): # backward compatibility, first argument was a dict. self.filename = None self._data = filename else: self.filename = filename self._data = data or {} self._is_changed = True super(DictStore, self).__init__(**kwargs) def store_load(self): if self.filename is None: return 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, 'rb') as fd: data = fd.read() if data: self._data = pickle.loads(data) def store_sync(self): if self.filename is None: return if not self._is_changed: return with open(self.filename, 'wb') as fd: pickle.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 list(self._data.keys())