code: protected void setAddOnLoaded(boolean isLoaded) {
          String oldState = mMetaData.getStatus();
          mMetaData.setStatus(AddOnMetadata.LOAD);
          firePropertyChangedEvent(new PropertyChangeEvent(this, PROPERTY_LOAD_STATE, oldState, mMetaData.getStatus()));
      }
docs: Changes the add-on loading state. Fires a property change event ({@link #PROPERTY_LOAD_STATE}).
  
  @param isLoaded The new add-on loading state.