/usr/share/pyshared/melange/common/pagination.py is in python-melange 1:2012.1-3.
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# Copyright 2011 OpenStack LLC.
# 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 urllib
import urlparse
from xml.dom import minidom
class AtomLink(object):
def __init__(self, rel, href):
self.rel = rel
self.href = href
def to_xml(self):
ATOM_NAMESPACE = "http://www.w3.org/2005/Atom"
doc = minidom.Document()
atom_elem = doc.createElementNS(ATOM_NAMESPACE, "link")
atom_elem.setAttribute("rel", self.rel)
atom_elem.setAttribute("href", self.href)
return atom_elem
class PaginatedDataView(object):
def __init__(self, collection_type, collection, current_page_url,
next_page_marker=None):
self.collection_type = collection_type
self.collection = collection
self.current_page_url = current_page_url
self.next_page_marker = next_page_marker
def data_for_json(self):
json_dict = {self.collection_type: self.collection}
if self._links():
links_key = self.collection_type + "_links"
json_dict[links_key] = self._links()
return json_dict
def data_for_xml(self):
atom_links = [AtomLink(link['rel'], link['href'])
for link in self._links()]
return {self.collection_type: self.collection + atom_links}
def _create_link(self, marker):
app_url = AppUrl(self.current_page_url)
return str(app_url.change_query_params(marker=marker))
def _links(self):
if not self.next_page_marker:
return []
next_link = dict(rel='next',
href=self._create_link(self.next_page_marker))
return [next_link]
class AppUrl(object):
def __init__(self, url):
self.url = url
def __str__(self):
return self.url
def change_query_params(self, **kwargs):
parsed_url = urlparse.urlparse(self.url)
query_params = dict(urlparse.parse_qsl(parsed_url.query))
query_params.update(kwargs)
new_query_params = urllib.urlencode(query_params)
return self.__class__(
urlparse.ParseResult(parsed_url.scheme,
parsed_url.netloc, parsed_url.path,
parsed_url.params, new_query_params,
parsed_url.fragment).geturl())
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