Method readFirstLine

guava/src/com/google/common/io/CharSource.java:312–322

Reads the first line of this source as a string. Returns {@code null} if this source is empty. <p>Like {@link BufferedReader#readLine()}, this method considers a line to be a sequence of text that is terminated by (but does not include) one of {@code \r\n}, {@code \r} or {@code \n}. If the source's

()

   * @throws IOException if an I/O error occurs while reading from this source
   */
  public @Nullable String readFirstLine() throws IOException {
    Closer closer = Closer.create();
    try {
      BufferedReader reader = closer.register(openBufferedStream());
      return reader.readLine();
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Reads all the lines of this source as a list of strings. The returned list will be empty if