println(
                "transferInitiated",
                message + ": " + event.getResource().getRepositoryUrl()
                        + event.getResource().getResourceName());
    }

    @Override
    public void transferProgressed(TransferEvent event) {
        TransferResource resource = event.getResource();
        downloads.put(resource, event.getTransferredBytes());

  // e.g. Optional<URL> tryGetResource or boolean resourceExists
  public static URL getResource(String resourceName) {
    ClassLoader loader =
        MoreObjects.firstNonNull(
            Thread.currentThread().getContextClassLoader(), Resources.class.getClassLoader());
    URL url = loader.getResource(resourceName);
    checkArgument(url != null, "resource %s not found.", resourceName);
    return url;
  }

        ongoing.putIfAbsent(new TransferResourceIdentifier(event.getResource()), Boolean.TRUE);
        put(event, false);
    }

    @Override
    public void transferStarted(TransferEvent event) throws TransferCancelledException {
        if (ongoing.get(new TransferResourceIdentifier(event.getResource())) == Boolean.FALSE) {
            throw new TransferCancelledException();
        }

    }

    /**
     * @throws Exception
     */
    public void testGetResource() throws Exception {
        assertNotNull(ResourceUtil.getResource("java/lang/String.class", "class"));
        assertNotNull(ResourceUtil.getResource("org/codelibs"));
        try {
            ResourceUtil.getResource("hoge", "xml");
            fail("2");
        } catch (final ResourceNotFoundRuntimeException e) {
            System.out.println(e);

     *
     * @param path
     *            リソースのパス。{@literal null}や空文字列であってはいけません
     * @return リソースの{@link URL}
     * @see #getResource(String, String)
     */
    public static URL getResource(final String path) {
        assertArgumentNotEmpty("path", path);

        return getResource(path, null);
    }

    /**
     * コンテキストクラスローダからリソースを返します。
     *
     * @param path

     */
    @Test
    public void testForEachJarFile() throws Exception {
        final String classFilePath = TestCase.class.getName().replace('.', '/') + ".class";
        final URL classURL = ResourceUtil.getResource(classFilePath);
        final JarURLConnection con = (JarURLConnection) classURL.openConnection();
        ClassTraversalUtil.forEach(con.getJarFile(), (ClassHandler) (packageName, shortClassName) -> {
            if (count < 10) {

        String direction = event.getRequestType() == TransferEvent.RequestType.PUT ? "to" : "from";

        TransferResource resource = event.getResource();
        MessageBuilder message = messageBuilderFactory.builder();
        message.style(STYLE).append(action).append(' ').append(direction).append(' ');
        message.resetStyle().append(resource.getRepositoryId());

        String direction = event.getRequestType() == TransferEvent.RequestType.PUT ? "to" : "from";

        TransferResource resource = event.getResource();
        StringBuilder message = new StringBuilder();
        message.append(action).append(' ').append(direction).append(' ').append(resource.getRepositoryId());
        message.append(": ");

      }
    }
    filesToDelete.clear();
  }

  private File getTestDir() throws IOException {
    if (testDir != null) {
      return testDir;
    }

    URL testFileUrl = IoTestCase.class.getResource("testdata/i18n.txt");
    if (testFileUrl == null) {
      throw new RuntimeException("unable to locate testdata directory");
    }

    if (testFileUrl.getProtocol().equals("file")) {
      try {

        transfers.remove(new TransferResourceIdentifier(event.getResource()));
        overridePreviousTransfer(event);

        super.transferSucceeded(event);
    }

    @Override
    public void transferFailed(TransferEvent event) {
        transfers.remove(new TransferResourceIdentifier(event.getResource()));
        overridePreviousTransfer(event);

        super.transferFailed(event);