Method lengthIfKnown

corpus/java/training/guava/io/CharSource.java:129–132

Returns the size of this source in chars, if the size can be easily determined without actually opening the data stream. The default implementation returns Optional#absent. Some sources, such as a CharSequence, may return a non-absent value. Note that in such cases, it is poss

()

   * @since 19.0
   */
  @Beta
  public Optional<Long> lengthIfKnown() {
    return Optional.absent();
  }

  /**
   * Returns the length of this source in chars, even if doing so requires opening and traversing an