*     IOException}.
   */
  public static void close(@CheckForNull Closeable closeable, boolean swallowIOException)
      throws IOException {
    if (closeable == null) {
      return;
    }
    try {
      closeable.close();
    } catch (IOException e) {
      if (swallowIOException) {
        logger.log(Level.WARNING, "IOException thrown while closing Closeable.", e);
      } else {
        throw e;

    TestInputStream in = new TestInputStream(new ByteArrayInputStream(new byte[10]));
    assertFalse(in.closed());
    sink.writeFrom(in);
    assertFalse(in.closed());
  }

  public void testClosesOnErrors_copyingFromByteSourceThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, READ_THROWS, CLOSE_THROWS)) {
      TestByteSource failSource = new TestByteSource(new byte[10], option);

        new TestInputStream(new ByteArrayInputStream(new byte[1]), TestOption.CLOSE_THROWS);
    Closeables.closeQuietly(in);
    assertTrue(in.closed());
  }

  public void testCloseQuietly_readerWithEatenException() throws IOException {
    TestReader in = new TestReader(TestOption.CLOSE_THROWS);
    Closeables.closeQuietly(in);
    assertTrue(in.closed());
  }

  public void testCloseNull() throws IOException {

                .readAttributes();
        assertThat(attributes.permissions()).containsExactly(OWNER_READ, OWNER_WRITE);
      }
    }
    out.close();

    // Check that source returns the right data
    assertTrue(Arrays.equals(data, source.read()));

    // Make sure that reset deleted the file
    out.reset();
    if (file != null) {

    writer.write("Hi");
    writer.close();

    assertThrows(IOException.class, () -> writer.write(" Greg"));

    assertThrows(IOException.class, () -> writer.flush());

    // close()ing already closed writer is allowed
    writer.close();
  }

    return 0;
  }

  @Override
  public boolean ready() throws IOException {
    return (current != null) && current.ready();
  }

  @Override
  public void close() throws IOException {
    if (current != null) {
      try {
        current.close();
      } finally {
        current = null;
      }
    }
  }

    checkNotClosed();
    if (target instanceof Flushable) {
      ((Flushable) target).flush();
    }
  }

  @Override
  public void close() throws IOException {
    this.closed = true;
    if (target instanceof Closeable) {
      ((Closeable) target).close();
    }
  }

  @Override
  public Writer append(char c) throws IOException {
    checkNotClosed();
    target.append(c);
    return this;

  public HashCode hash() {
    return hasher.hash();
  }

  // Overriding close() because FilterOutputStream's close() method pre-JDK8 has bad behavior:
  // it silently ignores any exception thrown by flush(). Instead, just close the delegate stream.
  // It should flush itself if necessary.
  @Override
  public void close() throws IOException {
    out.close();
  }

    advance();
  }

  @Override
  public void close() throws IOException {
    if (in != null) {
      try {
        in.close();
      } finally {
        in = null;
      }
    }
  }

  /** Closes the current input stream and opens the next one, if any. */
  private void advance() throws IOException {
    close();
    if (it.hasNext()) {
      in = it.next().openStream();
    }
  }

        new TestInputStream(new ByteArrayInputStream(new byte[1]), TestOption.CLOSE_THROWS);
    Closeables.closeQuietly(in);
    assertTrue(in.closed());
  }

  public void testCloseQuietly_readerWithEatenException() throws IOException {
    TestReader in = new TestReader(TestOption.CLOSE_THROWS);
    Closeables.closeQuietly(in);
    assertTrue(in.closed());
  }

  public void testCloseNull() throws IOException {