code: @Override
    public void reset() {
      mappings.clear();
      lastMapping = null;
      sourceFileMap.clear();
      sourceFileContentMap.clear();
      originalNameMap.clear();
      lastSourceFile = null;
      lastSourceFileIndex = -1;
      offsetPosition = new FilePosition(0, 0);
      prefixPosition = new FilePosition(0, 0);
    }
docs: {@inheritDoc}