Merged BRANCHES/DEV/V4.1-BUG-FIX to HEAD

47670: ALF-18245 - BM-0013: Soak: Run 06: Search population of ScriptNode is expensive
          - Optimizations to improve the performance of the repository when retrieving the populating data needed for Share Search results
          - Additional service method to PersonService to allow retrieval of a person or null in a single operation - rather than exists() followed get()
          - Improvements to generate of full name strings for a Person - only retrieve minimum needed properties rather than allprops from cm:person
          - Improvements to generation of DisplayPath to avoid multiple permission checks

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@47674 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/service/cmr/security/PersonService.java

@@ -65,6 +65,20 @@ public interface PersonService
      */
     @Auditable(parameters = {"userName"})
     public NodeRef getPerson(String userName);
+    
+    /**
+     * Get a person by userName. The person is store in the repository. No missing
+     * person objects will be created as a side effect of this call. If the person
+     * is missing from the repository null will be returned.
+     * 
+     * @param userName -
+     *            the userName key to find the person
+     * @return Returns the existing person node, or null if does not exist.
+     * 
+     * @see #createMissingPeople()
+     */
+    @Auditable(parameters = {"userName"})
+    public NodeRef getPersonOrNull(String userName);
 
     /**
      * Retrieve the person NodeRef for a {@code username}, optionally creating