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/usr/lib/python2.7/dist-packages/horizon/browsers/views.py is in python-django-horizon 1:2014.1.5-0ubuntu2.1.

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# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2012 Nebula, Inc.
#
#    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.

from django.utils.translation import ugettext_lazy as _

from horizon.tables import MultiTableView  # noqa
from horizon.utils import memoized


class ResourceBrowserView(MultiTableView):
    browser_class = None

    def __init__(self, *args, **kwargs):
        if not self.browser_class:
            raise ValueError("You must specify a ResourceBrowser subclass "
                             "for the browser_class attribute on %s."
                             % self.__class__.__name__)
        self.table_classes = (self.browser_class.navigation_table_class,
                              self.browser_class.content_table_class)
        self.navigation_selection = False
        super(ResourceBrowserView, self).__init__(*args, **kwargs)

    @memoized.memoized_method
    def get_browser(self):
        browser = self.browser_class(self.request, **self.kwargs)
        browser.set_tables(self.get_tables())
        if not self.navigation_selection:
            ct = browser.content_table
            item = browser.navigable_item_name.lower()
            ct._no_data_message = _("Select a %s to browse.") % item
        return browser

    def get_context_data(self, **kwargs):
        context = super(ResourceBrowserView, self).get_context_data(**kwargs)
        browser = self.get_browser()
        context["%s_browser" % browser.name] = browser
        return context