--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/logic/out_of_band.py	Thu Aug 28 16:17:42 2008 +0000
@@ -0,0 +1,46 @@
+#!/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.
+
+"""Out-of-band responses to render instead of the usual HTTP response.
+"""
+
+__authors__ = [
+  '"Todd Larsen" <tlarsen@google.com>',
+  ]
+
+
+class OutOfBandResponse(Exception):
+  """Base exception for out-of-band responses raised by controller logic.
+  """
+  pass
+
+
+class ErrorResponse(OutOfBandResponse):
+  """Out-of-band response when controller logic needs a special error page.
+  """
+
+  def __init__(self, message, **response_args):
+    """Constructor used to set error message and HTTP response arguments.
+  
+    Args:
+      message: error message to display on the error page
+      **response_args: keyword arguments that are supplied directly to
+        django.http.HttpResponse; the most commonly used is 'status' to
+        set the HTTP status code for the response
+    """
+    self.message = message
+    self.response_args = response_args
+