Added QNameDAO.updateNamespaceEntity and related tests

- To use directly, get the 'qnameDAO' bean; it implements the QNameDAO interface.
 - The new namespace must not exist
 - No reindexing is done


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@11002 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/QNameDAO.java

@@ -67,6 +67,16 @@ public interface QNameDAO
      */
     NamespaceEntity newNamespaceEntity(String namespaceUri);
     
+    /**
+     * Modifies an existing namespace URI.  If the new URI already exists, then no
+     * new entity is created and a concurrency 
+     * 
+     * @param oldNamespaceUri           the old namespace URI
+     * @param newNamespaceUri           the new namespace URI
+     * @throws AlfrescoRuntimeException if the new namespace is in use
+     */
+    void updateNamespaceEntity(String oldNamespaceUri, String newNamespaceUri);
+    
     /**
      * @param id            the unique ID of the entity
      * @return              the QName entity (never null)