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# Source code for sphinx.websupport.storage

    # -*- coding: utf-8 -*-
    """
        sphinx.websupport.storage
        ~~~~~~~~~~~~~~~~~~~~~~~~~

        Storage for the websupport package.

        :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
        :license: BSD, see LICENSE for details.
    """

    class StorageBackend(object):
        def pre_build(self):
            """Called immediately before the build process begins. Use this
            to prepare the StorageBackend for the addition of nodes.
            """
            pass

        def has_node(self, id):
            """Check to see if a node exists.

            :param id: the id to check for.
            """
            raise NotImplementedError()

        def add_node(self, id, document, source):
            """Add a node to the StorageBackend.

            :param id: a unique id for the comment.
            :param document: the name of the document the node belongs to.
            :param source: the source files name.
            """
            raise NotImplementedError()

        def post_build(self):
            """Called after a build has completed. Use this to finalize the
            addition of nodes if needed.
            """
            pass

        def add_comment(self, text, displayed, username, time,
                        proposal, node_id, parent_id, moderator):
            """Called when a comment is being added.

            :param text: the text of the comment
            :param displayed: whether the comment should be displayed
            :param username: the name of the user adding the comment
            :param time: a date object with the time the comment was added
            :param proposal: the text of the proposal the user made
            :param node_id: the id of the node that the comment is being added to
            :param parent_id: the id of the comment's parent comment.
            :param moderator: whether the user adding the comment is a moderator
            """
            raise NotImplementedError()

        def delete_comment(self, comment_id, username, moderator):
            """Delete a comment.

            Raises :class:`~sphinx.websupport.errors.UserNotAuthorizedError`
            if moderator is False and `username` doesn't match the username
            on the comment.

            :param comment_id: The id of the comment being deleted.
            :param username: The username of the user requesting the deletion.
            :param moderator: Whether the user is a moderator.
            """
            raise NotImplementedError()

        def get_metadata(self, docname, moderator):
            """Get metadata for a document. This is currently just a dict
            of node_id's with associated comment counts.

            :param docname: the name of the document to get metadata for.
            :param moderator: whether the requester is a moderator.
            """
            raise NotImplementedError()

        def get_data(self, node_id, username, moderator):
            """Called to retrieve all data for a node. This should return a
            dict with two keys, *source* and *comments* as described by
            :class:`~sphinx.websupport.WebSupport`'s
            :meth:`~sphinx.websupport.WebSupport.get_data` method.

            :param node_id: The id of the node to get data for.
            :param username: The name of the user requesting the data.
            :param moderator: Whether the requestor is a moderator.
            """
            raise NotImplementedError()

        def process_vote(self, comment_id, username, value):
            """Process a vote that is being cast. `value` will be either -1, 0,
            or 1.

            :param comment_id: The id of the comment being voted on.
            :param username: The username of the user casting the vote.
            :param value: The value of the vote being cast.
            """
            raise NotImplementedError()

        def update_username(self, old_username, new_username):
            """If a user is allowed to change their username this method should
            be called so that there is not stagnate data in the storage system.

            :param old_username: The username being changed.
            :param new_username: What the username is being changed to.
            """
            raise NotImplementedError()

        def accept_comment(self, comment_id):
            """Called when a moderator accepts a comment. After the method is
            called the comment should be displayed to all users.

            :param comment_id: The id of the comment being accepted.
            """
            raise NotImplementedError()