Method copyTo

guava/src/com/google/common/io/CharSource.java:247–260

Appends the contents of this source to the given {@link Appendable} (such as a {@link Writer}). Does not close {@code appendable} if it is {@code Closeable}. @return the number of characters copied @throws IOException if an I/O error occurs while reading from this source or writing to {@code ap

(Appendable appendable)

   *     appendable}
   */
  @CanIgnoreReturnValue
  public long copyTo(Appendable appendable) throws IOException {
    checkNotNull(appendable);

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

  /**
   * Copies the contents of this source to the given sink.