text: # Copyright 2012 NEC Corporation
  #
  #    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.
  
  """
  Views for managing Neutron Networks.
  """
  from django.core.urlresolvers import reverse
  from django.core.urlresolvers import reverse_lazy
  from django.utils.translation import ugettext_lazy as _
  
  from horizon import exceptions
  from horizon import forms
  from horizon import tables
  from horizon.utils import memoized
  from horizon import workflows
  
  from openstack_dashboard import api
  
  from openstack_dashboard.dashboards.project.networks \
      import forms as project_forms
  from openstack_dashboard.dashboards.project.networks.ports \
      import tables as port_tables
  from openstack_dashboard.dashboards.project.networks.subnets \
      import tables as subnet_tables
  from openstack_dashboard.dashboards.project.networks \
      import tables as project_tables
  from openstack_dashboard.dashboards.project.networks \
      import workflows as project_workflows
  
  
  class IndexView(tables.DataTableView):
      table_class = project_tables.NetworksTable
      template_name = 'project/networks/index.html'
      page_title = _("Networks")
  
      def get_data(self):
          try:
              tenant_id = self.request.user.tenant_id
              networks = api.neutron.network_list_for_tenant(self.request,
                                                             tenant_id)
          except Exception:
              networks = []
              msg = _('Network list can not be retrieved.')
              exceptions.handle(self.request, msg)
          return networks
  
  
  class CreateView(workflows.WorkflowView):
      workflow_class = project_workflows.CreateNetwork
      ajax_template_name = 'project/networks/create.html'
  
  
  class UpdateView(forms.ModalFormView):
      context_object_name = 'network'
      form_class = project_forms.UpdateNetwork
      form_id = "update_network_form"
      modal_header = _("Edit Network")
      submit_label = _("Save Changes")
      submit_url = "horizon:project:networks:update"
      success_url = reverse_lazy("horizon:project:networks:index")
      template_name = 'project/networks/update.html'
      page_title = _("Update Network")
  
      def get_context_data(self, **kwargs):
          context = super(UpdateView, self).get_context_data(**kwargs)
          args = (self.kwargs['network_id'],)
          context["network_id"] = self.kwargs['network_id']
          context["submit_url"] = reverse(self.submit_url, args=args)
          return context
  
      @memoized.memoized_method
      def _get_object(self, *args, **kwargs):
          network_id = self.kwargs['network_id']
          try:
              return api.neutron.network_get(self.request, network_id)
          except Exception:
              redirect = self.success_url
              msg = _('Unable to retrieve network details.')
              exceptions.handle(self.request, msg, redirect=redirect)
  
      def get_initial(self):
          network = self._get_object()
          return {'network_id': network['id'],
                  'tenant_id': network['tenant_id'],
                  'name': network['name'],
                  'admin_state': network['admin_state_up']}
  
  
  class DetailView(tables.MultiTableView):
      table_classes = (subnet_tables.SubnetsTable, port_tables.PortsTable)
      template_name = 'project/networks/detail.html'
      page_title = _("Network Details")
  
      def get_subnets_data(self):
          try:
              network = self._get_data()
              subnets = api.neutron.subnet_list(self.request,
                                                network_id=network.id)
          except Exception:
              subnets = []
              msg = _('Subnet list can not be retrieved.')
              exceptions.handle(self.request, msg)
          return subnets
  
      def get_ports_data(self):
          try:
              network_id = self.kwargs['network_id']
              ports = api.neutron.port_list(self.request, network_id=network_id)
          except Exception:
              ports = []
              msg = _('Port list can not be retrieved.')
              exceptions.handle(self.request, msg)
          return ports
  
      @memoized.memoized_method
      def _get_data(self):
          try:
              network_id = self.kwargs['network_id']
              network = api.neutron.network_get(self.request, network_id)
              network.set_id_as_name_if_empty(length=0)
          except Exception:
              msg = _('Unable to retrieve details for network "%s".') \
                  % (network_id)
              exceptions.handle(self.request, msg,
                                redirect=self.get_redirect_url())
          return network
  
      def get_context_data(self, **kwargs):
          context = super(DetailView, self).get_context_data(**kwargs)
          network = self._get_data()
          context["network"] = network
          table = project_tables.NetworksTable(self.request)
          context["url"] = self.get_redirect_url()
          context["actions"] = table.render_row_actions(network)
          context["page_title"] = _("Network Details: "
                                    "%(network_name)s") % {'network_name':
                                                           network.name}
          return context
  
      @staticmethod
      def get_redirect_url():
          return reverse_lazy('horizon:project:networks:index')
  