ncclient:NETCONF Python client

#!/usr/bin/env python

'Boilerplate'

from ncclient import OperationError

from . import MissingCapabilityError

def one_of(*args):

    'Verifies that only one of the arguments is not None'

    for i, arg in enumerate(args):

        if arg is not None:

            for argh in args[i+1:]:

                if argh is not None:

                    raise OperationError('Too many parameters')

            else:

                return

    raise OperationError('Insufficient parameters')

def store_or_url(store, url):

    one_of(store, url)

    node = {}

    if store is not None:

        node['tag'] = store

    else:

        node['tag'] = 'url'

        node['text'] = url

    return node

def build_filter(type, criteria):

    filter = {

        'tag': 'filter',

        'attributes': {'type': type}

    }

    if type == 'xpath':

        filter['attributes']['select'] = criteria

    else:

        filter['subtree'] = [criteria]

    return filter