code: @Override
      public final void fireDiff(final EDiff paramDiff, final ITreeStructData paramNewNode,
          final ITreeStructData paramOldNode, final DiffDepth paramDepth) {
          for (final IDiffObserver observer : mDiffObservers) {
              observer.diffListener(paramDiff, paramNewNode, paramOldNode, paramDepth);
          }
      }
docs: {@inheritDoc}