docs: public static MappedByteBuffer mapExistingFile(
          final File location,
          final FileChannel.MapMode mapMode,
          final String descriptionLabel)
      {
          checkFileExists(location, descriptionLabel);
  
          MappedByteBuffer mappedByteBuffer = null;
          try (RandomAccessFile file = new RandomAccessFile(location, "rw");
              FileChannel channel = file.getChannel())
          {
              mappedByteBuffer = channel.map(mapMode, 0, channel.size());
          }
          catch (final IOException ex)
          {
              LangUtil.rethrowUnchecked(ex);
          }
  
          return mappedByteBuffer;
      }