[Zope3-checkins] CVS: Zope3/src/zope/app/services - folder.py:1.4

[Jim Fulton]

Update of /cvs-repository/Zope3/src/zope/app/services
In directory cvs.zope.org:/tmp/cvs-serv12947/src/zope/app/services

Modified Files:
	folder.py 
Log Message:
Added code to prevent deleting the last configuration manager from a site-management folder

=== Zope3/src/zope/app/services/folder.py 1.3 => 1.4 ===
--- Zope3/src/zope/app/services/folder.py:1.3	Sun Mar 23 12:20:48 2003
+++ Zope3/src/zope/app/services/folder.py	Sun Mar 23 13:04:26 2003
@@ -28,6 +28,7 @@
 from zope.app.traversing import getPath
 from zope.proxy.context import ContextMethod, ContextWrapper
 from zope.app.interfaces.services.configuration import IConfigurationManager
+from zope.app.interfaces.services.folder import NoConfigurationManagerError
 
 class SiteManagementFolder(BTreeContainer):
     __implements__ = ISiteManagementFolder
@@ -36,6 +37,20 @@
         super(SiteManagementFolder, self).__init__()
         self.setObject('configure', ConfigurationManager())
 
+
+    def __delitem__(self, name):
+        """Delete an item, but not if it's the last configuration manager
+        """
+
+        item = self[name]
+        if IConfigurationManager.isImplementedBy(item):
+            # Check to make sure it's not the last one
+            if len([i for i in self.values()
+                    if IConfigurationManager.isImplementedBy(i)]) < 2:
+                raise NoConfigurationManagerError(
+                    "Can't delete the last configuration manager")
+        BTreeContainer.__delitem__(self, name)
+
     def getConfigurationManager(self):
         """Get a configuration manager
         """
@@ -47,7 +62,8 @@
                 # We found one. Get it in context
                 return ContextWrapper(item, self, name=name)
         else:
-            raise SystemError("Couldn't find an configuration manager")
+            raise NoConfigurationManagerError(
+                "Couldn't find an configuration manager")
     
     getConfigurationManager = ContextMethod(getConfigurationManager)