--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/logic/site/settings.py	Sat Sep 13 22:00:51 2008 +0000
@@ -0,0 +1,82 @@
+#!/usr/bin/python2.5
+#
+# Copyright 2008 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.
+
+"""SiteSettings (Model) query functions.
+"""
+
+__authors__ = [
+  '"Pawel Solyga" <pawel.solyga@gmail.com>',
+  ]
+
+from google.appengine.ext import db
+
+import soc.models.site_settings
+import soc.logic.model
+
+def getSiteSettingsFromPath(path):
+  """Returns SiteSettings entity for a given path, or None if not found.  
+    
+  Args:
+    path: a request path of the SiteSettings that uniquely identifies it
+  """
+  # lookup by Settings:path key name
+  key_name = getSiteSettingsKeyNameForPath(path)
+  
+  if key_name:
+    site_settings = soc.models.site_settings.SiteSettings.get_by_key_name(key_name)
+  else:
+    site_settings = None
+  
+  return site_settings
+
+def getSiteSettingsKeyNameForPath(path):
+  """Return a Datastore key_name for a SiteSettings from the path.
+  
+  Args:
+    path: a request path of the SiteSettings that uniquely identifies it
+  """
+  if not path:
+    return None
+
+  return 'Settings:%s' % path
+
+
+def updateOrCreateSiteSettingsFromPath(path, **site_settings_properties):
+  """Update existing SiteSettings entity, or create new one with supplied properties.
+
+  Args:
+    path: a request path of the SiteSettings that uniquely identifies it
+    **site_settings_properties: keyword arguments that correspond to Document entity
+      properties and their values
+
+  Returns:
+    the SiteSettings entity corresponding to the path, with any supplied
+    properties changed, or a new SiteSettings entity now associated with the 
+    supplied path and properties.
+  """
+  # attempt to retrieve the existing Site Settings
+  site_settings = getSiteSettingsFromPath(path)
+
+  if not site_settings:
+    # site settings did not exist, so create one in a transaction
+    key_name = getSiteSettingsKeyNameForPath(path)
+    site_settings = soc.models.site_settings.SiteSettings.get_or_insert(
+      key_name, **site_settings_properties)
+
+  # there is no way to be sure if get_or_insert() returned a new SiteSettings or
+  # got an existing one due to a race, so update with site_settings_properties anyway,
+  # in a transaction
+  return soc.logic.model.updateModelProperties(site_settings, **site_settings_properties)