Method listFiles

solr/core/src/java/org/apache/solr/cli/PostTool.java:439–445

(Path directory, Predicate<Path> fileFilter)

  }

  private static Collection<Path> listFiles(Path directory, Predicate<Path> fileFilter)
      throws IOException {
    Predicate<Path> filter = fileFilter != null ? fileFilter : p -> true;
    try (Stream<Path> directoryFiles = Files.list(directory)) {
      return directoryFiles.filter(filter).collect(Collectors.toList());
    }
  }

  /**
   * Check all the arguments looking to see if any are directories, and if so then we can recurse