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# Copyright 2009 Canonical Ltd.

# This file is part of lazr.restfulclient.
#
# lazr.restfulclient is free software: you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, version 3 of the
# License.
#
# lazr.restfulclient 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with lazr.restfulclient. If not, see
# <http://www.gnu.org/licenses/>.

"""Classes for working with JSON."""

__metaclass__ = type
__all__ = ['DatetimeJSONEncoder']

import datetime

try:
    # Python 3 and sufficiently modern Python 2 versions.
    from json import JSONEncoder
except ImportError:
    from simplejson import JSONEncoder


class DatetimeJSONEncoder(JSONEncoder):
    """A JSON encoder that understands datetime objects.

    Datetime objects are formatted according to ISO 1601.
    """
    def default(self, obj):
        if isinstance(obj, datetime.datetime):
            return obj.isoformat()
        return JSONEncoder.default(self, obj)