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−#!/usr/bin/python2.5
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−#
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−# Copyright 2008 the Melange authors.
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−#
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−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
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−# You may obtain a copy of the License at
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−#
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−#   http://www.apache.org/licenses/LICENSE-2.0
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−#
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−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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−# See the License for the specific language governing permissions and
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−# limitations under the License.
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−
+
−"""Sponsor (Model) query functions.
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−"""
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−
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−__authors__ = [
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−  '"Pawel Solyga" <pawel.solyga@gmail.com>',
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−  ]
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−
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−
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−from soc.logic import key_name
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−from soc.logic import out_of_band
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−
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−import soc.models.sponsor
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−import soc.logic.model
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−
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−
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−def doesLinkNameExist(link_name=None):
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−  """Returns True if link name exists in the Datastore.
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−
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−  Args:
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−    link_name: link name used in URLs to identify Sponsor
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−  """
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−  if getSponsorFromLinkName(link_name):
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−    return True
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−  else:
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−    return False
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−
+
−
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−def getSponsorFromLinkName(link_name):
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−  """Returns Sponsor entity for a given link name, or None if not found.  
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−    
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−  Args:
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−    link_name: a link name of the Sponsor that uniquely identifies it
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−  """
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−  # lookup by Sponsor key name
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−  sponsor_key_name = getSponsorKeyNameForLinkName(link_name)
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−  
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−  if key_name:
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−    sponsor = soc.models.sponsor.Sponsor.get_by_key_name(sponsor_key_name)
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−  else:
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−    sponsor = None
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−  
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−  return sponsor
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−
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−
+
−def getSponsorIfLinkName(link_name=None):
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−  """Returns Sponsor entity for supplied link name if one exists.
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−
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−  Args:
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−    link_name: a link name of the Sponsor that uniquely identifies it
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−
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−  Returns:
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−    * None if link name is false.
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−    * Sponsor entity for supplied linkname
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−
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−  Raises:
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−    out_of_band.ErrorResponse if link name is not false, but no Sponsor entity
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−    with the supplied link name exists in the Datastore
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−  """
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−  if not link_name:
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−    # exit without error, to let view know that link_name was not supplied
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−    return None
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−
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−  linkname_sponsor = getSponsorFromLinkName(link_name=link_name)
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−
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−  if linkname_sponsor:
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−    # a Sponsor exist for this linkname, so return that Sponsor entity
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−    return linkname_sponsor
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−
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−  # else: a linkname was supplied, but there is no Sponsor that has it
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−  raise out_of_band.ErrorResponse(
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−      'There is no sponsor with a "link name" of "%s".' % link_name, status=404)
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−
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−
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−def getSponsorKeyNameForLinkName(link_name):
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−  """Return a Datastore key_name for a Sponsor from the link name.
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−  
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−  Args:
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−    link_name: a link name of the Sponsor that uniquely identifies it
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−  """
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−  if not link_name:
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−    return None
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−
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−  return key_name.nameSponsor(link_name)
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−
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−
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−def getSponsorsForLimitAndOffset(limit, offset=0):
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−  """Returns Sponsors entities for given offset and limit or None if not found.
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−
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−  Args:
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−    limit: max amount of entities to return
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−    offset: optional offset in entities list which defines first entity to
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−      return; default is zero (first entity)
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−  """
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−  query = soc.models.sponsor.Sponsor.all()
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−  return query.fetch(limit, offset)
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−
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−
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−def updateOrCreateSponsorFromLinkName(sponsor_link_name, **sponsor_properties):
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−  """Update existing Sponsor entity, or create new one with supplied properties.
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−
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−  Args:
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−    sponsor_name: a linkname of the Sponsor that uniquely identifies it
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−    **sponsor_properties: keyword arguments that correspond to Sponsor entity
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−      properties and their values
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−
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−  Returns:
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−    the Sponsor entity corresponding to the path, with any supplied
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−    properties changed, or a new Sponsor entity now associated with the 
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−    supplied path and properties.
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−  """
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−  # attempt to retrieve the existing Sponsor
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−  sponsor = getSponsorFromLinkName(sponsor_link_name)
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−
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−  if not sponsor:
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−    # sponsor did not exist, so create one in a transaction
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−    sponsor_key_name = getSponsorKeyNameForLinkName(sponsor_link_name)
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−    sponsor = soc.models.sponsor.Sponsor.get_or_insert(
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−      sponsor_key_name, **sponsor_properties)
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−
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−  # there is no way to be sure if get_or_insert() returned a new Sponsor or
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−  # got an existing one due to a race, so update with sponsor_properties anyway,
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−  # in a transaction
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−  return soc.logic.model.updateModelProperties(sponsor, **sponsor_properties)