code: public Collection<LogFilePath> getPaths(TopicPartitionGroup topicPartitionGroup) {
          HashSet<LogFilePath> logFilePaths = mFiles.get(topicPartitionGroup);
          if (logFilePaths == null) {
              return new HashSet<LogFilePath>();
          }
          return new HashSet<LogFilePath>(logFilePaths);
      }
docs: Get paths in a given topic partition.
  @param topicPartitionGroup The topic partition to retrieve paths for.
  @return Collection of file paths in the given topic partition.