# -*- coding: utf-8 -*-
# Copyright 2010 Google Inc.
# Copyright 2012 Richard Lincoln
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.


class EntityProxyId(object):
    """A stable, opaque id of an {@link EntityProxy} that remains stable across
    updates, creates, deletes on the client.
    <p>
    In particular, an {@link EntityProxy} foo that is yet to be persisted and a
    copy of foo after being persisted have equal {@link EntityProxyId}.

    @param <P> the entity type
    """

    def getProxyClass(self):
        """Returns the class of the proxy identified.

        @return a Class object of type P
        """
        raise NotImplementedError
