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Filename : dbdoc.py
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# MySQL Connector/Python - MySQL driver written in Python.
# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

# MySQL Connector/Python is licensed under the terms of the GPLv2
# <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
# MySQL Connectors. There are special exceptions to the terms and
# conditions of the GPLv2 as it is applied to this software, see the
# FOSS License Exception
# <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

"""Implementation of the DbDoc."""

import json
import uuid

from .compat import STRING_TYPES


class DbDoc(object):
    """Represents a generic document in JSON format.

    Args:
        value (object): The value can be a JSON string or a dict.

    Raises:
        ValueError: If ``value`` type is not a basestring or dict.
    """
    def __init__(self, value):
        # TODO: Handle exceptions. What happens if it doesn't load properly?
        if isinstance(value, dict):
            self.__dict__ = value
        elif isinstance(value, STRING_TYPES):
            self.__dict__ = json.loads(value)
        else:
            raise ValueError("Unable to handle type: {0}".format(type(value)))

    def __getitem__(self, index):
        return self.__dict__[index]

    def keys(self):
        return self.__dict__.keys()

    def ensure_id(self):
        if "_id" not in self.__dict__:
            self.__dict__["_id"] = uuid.uuid4().hex
        return self.__dict__["_id"]

    def __str__(self):
        return json.dumps(self.__dict__)