/**
  * Obtains all {@link MappingClass}es for this adapter's tree root.
  *
  * @return the <code>MappingClass</code>es or an empty list
  */
 public List getAllMappingClasses() {
   // startTracking("getAllMappingClasses()"); //$NON-NLS-1$
   List returnList = Collections.unmodifiableList(mappingLocator.getMappingClasses());
   // stopTracking("getAllMappingClasses()"); //$NON-NLS-1$
   return returnList;
 }