jan: thuban/Thuban/UI extensionregistry.py,1.1,1.2

[cvs@intevation.de]

Author: jan

Update of /thubanrepository/thuban/Thuban/UI
In directory doto:/tmp/cvs-serv3346

Modified Files:
	extensionregistry.py 
Log Message:
(ExtensionDesc.__init__): Added »···optional parameter init_callback.
ExtensionDesc.init_ext): New. Executes the callback and sets
a status.


Index: extensionregistry.py
===================================================================
RCS file: /thubanrepository/thuban/Thuban/UI/extensionregistry.py,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -d -r1.1 -r1.2
--- extensionregistry.py	28 Sep 2004 19:13:21 -0000	1.1
+++ extensionregistry.py	10 Mar 2005 22:39:11 -0000	1.2
@@ -1,6 +1,6 @@
-# Copyright (C) 2004 by Intevation GmbH
+# Copyright (C) 2004, 2005 by Intevation GmbH
 # Authors:
-# Jan-Oliver Wagner <jan at intevation.de>
+# Jan-Oliver Wagner <jan at intevation.de> (2004, 2005)
 #
 # This program is free software under the GPL (>=v2)
 # Read the file COPYING coming with Thuban for details.
@@ -23,13 +23,16 @@
 # $Source$
 # $Id$
 
+from Thuban import _
+
 class ExtensionDesc:
 
     """
     A description of a Thuban Extension.
     """
 
-    def __init__(self, name, version, authors, copyright, desc):
+    def __init__(self, name, version, authors, copyright, desc,
+                 init_callback = None):
         """
         Initialize a new Thuban Extension information.
 
@@ -50,13 +53,39 @@
                          Converts GNS (Geographical Name Service of NIMA)
                          to Shapefile format and displays the data.
                          ''')
+        init_callback -- a callback method that is executed if not
+                         None. This method should contain gui specific
+                         initializations of the extension.
+                         Default is None.
 
+                         This callback should return None if
+                         the intialisation as successful. Else
+                         a string describing the problems during
+                         intialization.
         """
         self.name = name
         self.version = version
         self.authors = authors
         self.copyright = copyright
         self.desc = desc
+        self.init_callback = init_callback
+        self.status = _("Initialization not yet requested.")
+
+    def init_ext(self):
+        """Execute the init callback for the extension.
+
+        Do nothing if the callback is None.
+
+        It is expected that the callback function returns
+        None if all was OK and a string if something was wrong.
+        The string is believed to describe the problems.
+        """
+        if self.init_callback is not None:
+            result = self.init_callback()
+            if result is not None:
+                self.status = result
+            else:
+                self.status = _("Initialization successful.")
 
 class ExtensionRegistry: