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# Copyright 2013 Red Hat, Inc. 

# All Rights Reserved. 

# 

#    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. 

 

import pecan 

from wsme import types as wtypes 

 

from magnum.api.controllers import base 

from magnum.api.controllers import link 

 

 

class Collection(base.APIBase): 

 

    next = wtypes.text 

    """A link to retrieve the next subset of the collection""" 

 

    @property 

    def collection(self): 

        return getattr(self, self._type) 

 

    def has_next(self, limit): 

        """Return whether collection has more items.""" 

        return len(self.collection) and len(self.collection) == limit 

 

    def get_next(self, limit, url=None, **kwargs): 

        """Return a link to the next subset of the collection.""" 

        if not self.has_next(limit): 

            return wtypes.Unset 

 

        resource_url = url or self._type 

        q_args = ''.join(['%s=%s&' % (key, kwargs[key]) for key in kwargs]) 

        next_args = '?%(args)slimit=%(limit)d&marker=%(marker)s' % { 

                                            'args': q_args, 'limit': limit, 

                                            'marker': self.collection[-1].uuid} 

 

        return link.Link.make_link('next', pecan.request.host_url, 

                                   resource_url, next_args).href