--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/tasks/start_update.py	Sat Sep 12 21:33:52 2009 +0200
@@ -0,0 +1,166 @@
+#!/usr/bin/python2.5
+#
+# Copyright 2009 the Melange authors.
+#
+# 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.
+
+"""Version update Tasks starters.
+"""
+
+__authors__ = [
+  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
+  '"Lennard de Rijk" <ljvderijk@gmail.com>',
+  ]
+
+
+from django import http
+from django.template import loader
+from django.utils.translation import ugettext
+
+from soc.views.helper import responses
+
+
+def getDjangoURLPatterns():
+  """Returns the URL patterns for the views in this module.
+  """
+
+  patterns = [(r'tasks/update/start$', 'soc.tasks.start_update.startTasks'),
+              (r'tasks/update/([a-z]+)$', 'soc.tasks.start_update.runner')]
+
+  return patterns
+
+
+def startTasks(request):
+  """Presents a view that allows the user to start update tasks.
+  """
+
+  template = 'soc/tasks/start_update.html'
+
+  context = responses.getUniversalContext(request)
+
+  options = runner.getOptions()
+
+  sorted_keys = []
+  for key, option in options.iteritems():
+    option['name'] = key
+    sorted_keys.append(
+        (option['from_version'], option['in_version_order'], key))
+
+  # sort the keys
+  sorted_keys.sort()
+
+  # store only the true option
+  sorted_options = []
+
+  for key_tuple in sorted_keys:
+    option_key = key_tuple[2]
+    sorted_options.append(options[option_key])
+
+  context.update(
+      page_name='Update Tasks starter',
+      options=sorted_options,
+      )
+
+  content = loader.render_to_string(template, dictionary=context)
+  return http.HttpResponse(content)
+
+
+class TaskRunner(object):
+  """Runs one of the supported task starters.
+  """
+
+  def __init__(self):
+    """Initializes the TaskRunner.
+    """
+
+    self.options = {
+        'program': self.programConversion(),
+        'student': self.studentConversion(),
+        'organization': self.orgConversion(),
+    }
+
+  def getOptions(self):
+    """Returns the supported options.
+    """
+
+    return self.options
+
+  def __call__(self, request, option):
+    """Starts the specified task.
+    """
+
+    context = responses.getUniversalContext(request)
+    context['page_name'] = 'Start Update Task'
+
+    option = self.options.get(option)
+    if not option:
+      template = 'soc/error.html'
+      context['message'] = 'Uknown option "%s".' % option
+    else:
+      template = 'soc/tasks/run_update.html'
+      context['option'] = option
+      context['success'] = option['updater'](request)
+
+    content = loader.render_to_string(template, dictionary=context)
+    return http.HttpResponse(content)
+
+  def programConversion(self):
+    """
+    """
+
+    description = ugettext('This converts the Program models to contain X,Y,Z. '
+                           'Note that this conversion will only work after Q')
+
+    # TODO(ljvderijk): implement this
+    updater = lambda x:False
+
+    conversion_information = {'from_version': 'V-1',
+                              'in_version_order': 2,
+                              'description': description,
+                              'updater': updater}
+
+    return conversion_information
+
+  def studentConversion(self):
+    """
+    """
+
+    description = ugettext('This converts the Student models to contain X,Y,Z.')
+
+    # TODO(ljvderijk): implement this
+    updater = lambda x:False
+
+    conversion_information = {'from_version': 'V-1',
+                              'in_version_order': 1,
+                              'description': description,
+                              'updater': updater}
+
+    return conversion_information
+
+  def orgConversion(self):
+    """
+    """
+
+    description = ugettext('This converts the Organization models to contain X,Y,Z.')
+
+    # TODO(ljvderijk): implement this
+    updater = lambda x:False
+
+    conversion_information = {'from_version': 'V-2',
+                              'in_version_order': 1,
+                              'description': description,
+                              'updater': updater}
+
+    return conversion_information
+
+runner = TaskRunner()