Method copy

corpus/java/training/guava/io/CharStreams.java:69–82

Copies all characters between the Readable and Appendable objects. Does not close or flush either object. @param from the object to read from @param to the object to write to @return the number of characters copied @throws IOException if an I/O error occurs

(Readable from, Appendable to)

   * @throws IOException if an I/O error occurs
   */
  @CanIgnoreReturnValue
  public static long copy(Readable from, Appendable to) throws IOException {
    checkNotNull(from);
    checkNotNull(to);
    CharBuffer buf = createBuffer();
    long total = 0;
    while (from.read(buf) != -1) {
      buf.flip();
      to.append(buf);
      total += buf.remaining();
      buf.clear();
    }
    return total;
  }

  /**
   * Reads all characters from a {@link Readable} object into a {@link String}. Does not close the