[Zope-CVS] CVS: Products/AdaptableStorage/mapper_std - MappingGateway.py:1.2

[Shane Hathaway]

Update of /cvs-repository/Products/AdaptableStorage/mapper_std
In directory cvs.zope.org:/tmp/cvs-serv19323/mapper_std

Modified Files:
	MappingGateway.py 
Log Message:
- Added LoadEvent and StoreEvent, which currently serve only to
clarify the code.

- Added tests of conflict detection.

- Added NoStateFoundError.  Classification gateways now raise
NoStateFoundError at the right times so it's possible to detect
attempts to overwrite state with new objects

- Made it easier for a SQL gateway to use multiple tables by adding a
setupTables() method to SQLGatewayBase

- Made FieldSchema.addFieldType public.



=== Products/AdaptableStorage/mapper_std/MappingGateway.py 1.1 => 1.2 ===
--- Products/AdaptableStorage/mapper_std/MappingGateway.py:1.1	Tue Dec 31 16:47:47 2002
+++ Products/AdaptableStorage/mapper_std/MappingGateway.py	Thu Jan  9 09:34:05 2003
@@ -18,7 +18,7 @@
 
 import time
 
-from mapper_public import IGateway
+from mapper_public import IGateway, NoStateFoundError
 
 class MappingGateway:
     """Stores data in a mapping."""
@@ -34,7 +34,11 @@
 
     def load(self, event):
         # Returns (data, serial)
-        return self.data[event.getKeychain()]
+        keychain = event.getKeychain()
+        try:
+            return self.data[keychain]
+        except KeyError:
+            raise NoStateFoundError(keychain)
 
     def store(self, event, data):
         serial = time.time()