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# (C) Copyright 2005-2025 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" The base class for all object serializers. """
# Standard library imports.
import logging
from traceback import print_exc
from os.path import splitext
import pickle
# Enthought library imports.
from apptools.persistence.versioned_unpickler import VersionedUnpickler
from traits.api import HasTraits, Str
# Setup a logger for this module.
logger = logging.getLogger(__name__)
class ObjectSerializer(HasTraits):
""" The base class for all object serializers. """
#### 'ObjectSerializer' interface #########################################
# The file extension recognized by this serializer.
ext = Str(".pickle")
###########################################################################
# 'ObjectSerializer' interface.
###########################################################################
def can_load(self, path):
""" Returns True if the serializer can load a file. """
rest, ext = splitext(path)
return ext == self.ext
def load(self, path):
""" Loads an object from a file. """
# Unpickle the object.
f = open(path, "rb")
try:
try:
obj = VersionedUnpickler(f).load()
except Exception as ex:
print_exc()
logger.exception(
"Failed to load pickle file: %s, %s" % (path, ex)
)
raise
finally:
f.close()
return obj
def can_save(self, obj):
""" Returns True if the serializer can save an object. """
return True
def save(self, path, obj):
""" Saves an object to a file. """
if not path.endswith(self.ext):
actual_path = path + self.ext
else:
actual_path = path
# Pickle the object.
f = open(actual_path, "wb")
try:
pickle.dump(obj, f, 1)
except Exception as ex:
logger.exception(
"Failed to pickle into file: %s, %s, object:%s"
% (path, ex, obj)
)
print_exc()
f.close()
return actual_path
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