code: public Map<String, RenameOperation> getRenameOperations() {
      Map<String, RenameOperation> renOperations = new TreeMap<String, RenameOperation>();
      for (Entry<String, IOperation> entry : collectionUpdateData.entrySet()) {
        String key = entry.getKey();
        IOperation op = entry.getValue();
        if (op.getOperationType().equals(Type.RENAME)) {
          renOperations.put(key, (RenameOperation)op);
        }
      }
      return renOperations;
    }
docs: Returns a Map of RENAME operations.
  
  @return Map of RENAME operations which have a non-null  default value specified