Method size

corpus/java/training/guava/io/ByteSource.java:192–217

Returns the size of this source in bytes, even if doing so requires opening and traversing an entire stream. To avoid a potentially expensive operation, see #sizeIfKnown. The default implementation calls #sizeIfKnown and returns the value if present. If absent, it will fall back

()

   * @throws IOException if an I/O error occurs in the process of reading the size of this source
   */
  public long size() throws IOException {
    Optional<Long> sizeIfKnown = sizeIfKnown();
    if (sizeIfKnown.isPresent()) {
      return sizeIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      InputStream in = closer.register(openStream());
      return countBySkipping(in);
    } catch (IOException e) {
      // skip may not be supported... at any rate, try reading
    } finally {
      closer.close();
    }

    closer = Closer.create();
    try {
      InputStream in = closer.register(openStream());
      return ByteStreams.exhaust(in);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Counts the bytes in the given input stream using skip if possible. Returns SKIP_FAILED if the