Method length

guava/src/com/google/common/io/CharSource.java:213–228

Returns the length of this source in chars, even if doing so requires opening and traversing an entire stream. To avoid a potentially expensive operation, see {@link #lengthIfKnown}. <p>The default implementation calls {@link #lengthIfKnown} and returns the value if present. If absent, it will fall

()

   * @since 19.0
   */
  public long length() throws IOException {
    Optional<Long> lengthIfKnown = lengthIfKnown();
    if (lengthIfKnown.isPresent()) {
      return lengthIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      Reader reader = closer.register(openStream());
      return countBySkipping(reader);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  private static long countBySkipping(Reader reader) throws IOException {
    long count = 0;