code: @Override
      public Set<String> getObjectId(File uploadedFile) throws HarvesterException {
          Set<String> objectIds = new HashSet<String>();
          try {
              objectIds.add(createDigitalObject(uploadedFile));
          } catch (StorageException se) {
              throw new HarvesterException(se);
          }
          return objectIds;
      }
docs: Get an individual uploaded file as a digital object. For consistency this
  should be in a list.
  
  @return a list of one object ID
  @throws HarvesterException if there was an error retrieving the objects