Method writeFrom

guava/src/com/google/common/io/CharSink.java:167–174

Writes all the text from the given {@link Readable} (such as a {@link Reader}) to this sink. Does not close {@code readable} if it is {@code Closeable}. @return the number of characters written @throws IOException if an I/O error occurs while reading from {@code readable} or writing to this sin

(Readable readable)

   *     this sink
   */
  @CanIgnoreReturnValue
  public long writeFrom(Readable readable) throws IOException {
    checkNotNull(readable);

    try (Writer out = openStream()) {
      return CharStreams.copy(readable, out);
    }
  }
}