code: @Override
      public final String nameForKey(final int mKey) {
          checkState(!mPageReadTrx.isClosed(), "Transaction is already closed.");
          NodeMetaPageFactory.MetaKey key = new NodeMetaPageFactory.MetaKey(mKey);
          NodeMetaPageFactory.MetaValue value = (MetaValue)mPageReadTrx.getMetaBucket().get(key);
          return value == null ? null : value.getData();
      }
docs: {@inheritDoc}