code: public static Path[] getInputPaths(Configuration conf) {
      String[] pathStrs = Preconditions.checkNotNull(conf.getStrings(INPUT_PATHS_KEY),
          "You must call LuceneIndexInputFormat.setInputPaths()");
      Path[] paths = new Path[pathStrs.length];
      for (int i = 0; i < pathStrs.length; i++) {
        paths[i] = new Path(pathStrs[i]);
      }
      return paths;
    }
docs: Gets the input paths for this input format
  
  @param conf the job conf