def filter_create_attributes(cls, port):
     """Filter out port attributes not required for a create."""
     # TODO(kmestery): Converting to uppercase due to ODL bug
     # https://bugs.opendaylight.org/show_bug.cgi?id=477
     port['mac_address'] = port['mac_address'].upper()
     cls._filter_unmapped_null(port)
     odl_utils.try_del(port, ['status'])

 def filter_create_port_attributes(cls, port, context):
     """Filter out port attributes not required for a create."""
     cls.add_security_groups(port, context)
     # TODO(kmestery): Converting to uppercase due to ODL bug
     # https://bugs.opendaylight.org/show_bug.cgi?id=477
     port['mac_address'] = port['mac_address'].upper()
     odl_utils.try_del(port, ['status'])

 def filter_update_attributes(cls, port, context):
     """Filter out port attributes for an update operation."""
     cls._add_security_groups(port, context)
     cls._fixup_mac_address(port)
     cls._fixup_allowed_ipaddress_pairs(port[addr_pair.ADDRESS_PAIRS])
     odl_utils.try_del(port, ['network_id', 'id', 'status', 'mac_address',
                       'tenant_id', 'fixed_ips'])

    def filter_create_attributes(cls, port, context):
        """Filter out port attributes not required for a create."""
        cls._add_security_groups(port, context)
        cls._fixup_mac_address(port)
        cls._fixup_allowed_ipaddress_pairs(port[addr_pair.ADDRESS_PAIRS])
        odl_utils.try_del(port, ['status'])

        # NOTE(yamahata): work around for port creation for router
        # tenant_id=''(empty string) is passed when port is created
        # by l3 plugin internally for router.
        # On the other hand, ODL doesn't accept empty string for tenant_id.
        # In that case, deduce tenant_id from network_id for now.
        # Right fix: modify Neutron so that don't allow empty string
        # for tenant_id even for port for internal use.
        # TODO(yamahata): eliminate this work around when neutron side
        # is fixed
        # assert port['tenant_id'] != ''
        if port['tenant_id'] == '':
            LOG.debug('empty string was passed for tenant_id: %s(port)', port)
            port['tenant_id'] = context._network_context._network['tenant_id']

    def filter_create_port_attributes(cls, port, context):
        """Filter out port attributes not required for a create."""
        cls.add_security_groups(port, context)
        # TODO(kmestery): Converting to uppercase due to ODL bug
        # https://bugs.opendaylight.org/show_bug.cgi?id=477
        port['mac_address'] = port['mac_address'].upper()
        odl_utils.try_del(port, ['status'])

        # NOTE(yamahata): work around for port creation for router
        # tenant_id=''(empty string) is passed when port is created
        # by l3 plugin internally for router.
        # On the other hand, ODL doesn't accept empty string for tenant_id.
        # In that case, deduce tenant_id from network_id for now.
        # Right fix: modify Neutron so that don't allow empty string
        # for tenant_id even for port for internal use.
        # TODO(yamahata): eliminate this work around when neutron side
        # is fixed
        # assert port['tenant_id'] != ''
        if port['tenant_id'] == '':
            LOG.debug('empty string was passed for tenant_id: %s(port)', port)
            port['tenant_id'] = context._network_context._network['tenant_id']

def _filter_unmapped_null(resource_dict, unmapped_keys):
    # NOTE(yamahata): bug work around
    # https://bugs.eclipse.org/bugs/show_bug.cgi?id=475475
    #   Null-value for an unmapped element causes next mapped
    #   collection to contain a null value
    #   JSON: { "unmappedField": null, "mappedCollection": [ "a" ] }
    #
    #   Java Object:
    #   class Root {
    #     Collection<String> mappedCollection = new ArrayList<String>;
    #   }
    #
    #   Result:
    #   Field B contains one element; null
    #
    # TODO(yamahata): update along side with neutron and ODL
    #   add when neutron adds more extensions
    #   delete when ODL neutron northbound supports it
    # TODO(yamahata): do same thing for other resources
    keys_to_del = [key for key in unmapped_keys
                   if resource_dict.get(key) is None]
    if keys_to_del:
        odl_utils.try_del(resource_dict, keys_to_del)

 def filter_update_port_attributes(cls, port, context):
     """Filter out port attributes for an update operation."""
     cls.add_security_groups(port, context)
     odl_utils.try_del(port, ['network_id', 'id', 'status', 'mac_address',
                       'tenant_id', 'fixed_ips'])

def _filter_port_update(port):
    """Filter out port attributes for an update operation."""
    odl_utils.try_del(port, ['network_id', 'id', 'status', 'mac_address',
                      'tenant_id', 'fixed_ips'])
    _filter_unmapped_null(port, _PORT_UNMAPPED_KEYS)

def _filter_network_update(network):
    odl_utils.try_del(network, ['id', 'status', 'subnets', 'tenant_id'])

 def filter_create_attributes(cls, port):
     """Filter out port attributes not required for a create."""
     cls._filter_unmapped_null(port)
     odl_utils.try_del(port, ['status'])

 def filter_update_attributes(network):
     """Filter out network attributes for an update operation."""
     odl_utils.try_del(network, ['id', 'status', 'subnets', 'tenant_id'])

 def filter_create_network_attributes(network, context):
     """Filter out network attributes not required for a create."""
     odl_utils.try_del(network, ['status', 'subnets', 'vlan_transparent',
                       'mtu'])

 def filter_update_network_attributes(network, context):
     """Filter out network attributes for an update operation."""
     odl_utils.try_del(network, ['id', 'status', 'subnets', 'tenant_id',
                       'vlan_transparent', 'mtu'])

def _filter_port_create(port):
    """Filter out port attributes not required for a create."""
    _filter_port_unmapped_null(port)
    odl_utils.try_del(port, ['status'])

def _filter_network_create(network):
    odl_utils.try_del(network, ['status', 'subnets'])
    _filter_unmapped_null(network, _NETWORK_UNMAPPED_KEYS)

def _filter_network_update(network):
    odl_utils.try_del(network, ['id', 'status', 'subnets', 'tenant_id'])
    _filter_unmapped_null(network, _NETWORK_UNMAPPED_KEYS)

def _filter_subnet_update(subnet):
    odl_utils.try_del(subnet, ['id', 'network_id', 'ip_version', 'cidr',
                      'allocation_pools', 'tenant_id'])

def _filter_port_create(port):
    """Filter out port attributes not required for a create."""
    odl_utils.try_del(port, ['status'])
    _filter_unmapped_null(port, _PORT_UNMAPPED_KEYS)

def _filter_network_create(network):
    odl_utils.try_del(network, ['status', 'subnets'])