private Component buildPreferencesTab() {
    VerticalLayout root = new VerticalLayout();
    root.setCaption("Preferences");
    root.setIcon(FontAwesome.COGS);
    root.setSpacing(true);
    root.setMargin(true);
    root.setSizeFull();

    Label message = new Label("Not implemented in this demo");
    message.setSizeUndefined();
    message.addStyleName(ValoTheme.LABEL_LIGHT);
    root.addComponent(message);
    root.setComponentAlignment(message, Alignment.MIDDLE_CENTER);

    return root;
  }
  /** @param el */
  public BookImage(Books el, String user) {
    super();
    this.Book = el;

    this.setStyleName("cells");
    this.setHeight("250px");
    this.setWidth("200px");

    rating.setAnimated(true);
    rating.setCaption(null);
    rating.setMaxValue(5);
    rating.setStyleName("rating");
    rating.setReadOnly(true);

    rating_my.setAnimated(true);
    rating_my.setCaption(null);
    rating_my.setMaxValue(5);
    rating_my.setStyleName("rating_my");

    IRaitingService iRaitingService = new IRaitingService();
    try {
      double rate = iRaitingService.getRaiting(el.getId());
      rating.setReadOnly(false);
      rating.setValue(rate);
      rating.setReadOnly(true);
      double myrate = iRaitingService.getRaiting(user, el.getId());
      rating_my.setValue(myrate);
    } catch (SQLException e) {
      e.printStackTrace();
    }

    rating_my.addValueChangeListener(
        e -> {
          try {
            Rating rat =
                iRaitingService.getUser(
                    getUI().getSession().getAttribute("user").toString(), el.getId());

            rat.setRaiting(rating_my.getValue());

            iRaitingService.update(rat);

            double rate = iRaitingService.getRaiting(el.getId());
            rating.setReadOnly(false);
            rating.setValue(rate);
            rating.setReadOnly(true);

            new Notification(String.valueOf(rate), Notification.Type.TRAY_NOTIFICATION)
                .show(Page.getCurrent());
          } catch (SQLException e1) {
            e1.printStackTrace();
          }
        });

    rating_layout.addComponent(rating);
    rating_layout.addComponent(rating_my);
    rating_layout.setComponentAlignment(rating, Alignment.MIDDLE_LEFT);
    rating_layout.setComponentAlignment(rating_my, Alignment.MIDDLE_LEFT);
    rating_layout.setStyleName("ratinglayout");

    imageEmbedded.setSource(new FileResource(new File(Book.getImage())));

    title.setValue(Book.getTitle());
    author.setValue(Book.getAuthor());

    if (Book.getFile().isEmpty()) buttonDownload.setEnabled(false);

    buttonDownload.setWidth("80%");
    imageEmbedded.setWidth("100%");
    imageEmbedded.setHeight("100%");

    title.setWidth(null);
    author.setWidth(null);

    VerticalLayout bodyLayout = new VerticalLayout(title, author, imageEmbedded);

    bodyLayout.setExpandRatio(title, 12);
    bodyLayout.setExpandRatio(author, 8);
    bodyLayout.setExpandRatio(imageEmbedded, 80);
    bodyLayout.setSizeFull();
    bodyLayout.setComponentAlignment(title, Alignment.MIDDLE_CENTER);
    bodyLayout.setComponentAlignment(author, Alignment.MIDDLE_CENTER);
    bodyLayout.setComponentAlignment(imageEmbedded, Alignment.MIDDLE_CENTER);

    buttonDownload.setStyleName("super-button");
    title.setStyleName("name-label");
    author.setStyleName("author-label");

    this.addComponent(rating_layout);
    this.addComponent(bodyLayout);
    this.addComponent(buttonDownload);

    this.setComponentAlignment(rating_layout, Alignment.TOP_CENTER);
    this.setComponentAlignment(bodyLayout, Alignment.TOP_CENTER);
    this.setComponentAlignment(buttonDownload, Alignment.BOTTOM_CENTER);
    this.setExpandRatio(rating_layout, 5);
    this.setExpandRatio(bodyLayout, 85);
    this.setExpandRatio(buttonDownload, 10);

    StreamResource sr = getStream();
    FileDownloader fileDownloader = new FileDownloader(sr);
    fileDownloader.extend(buttonDownload);

    bodyLayout.addLayoutClickListener(
        e -> {
          BookWin win = new BookWin(this.Book);
          UI.getCurrent().addWindow(win);
        });
  }
  private Component buildProfileTab() {
    HorizontalLayout root = new HorizontalLayout();
    root.setCaption("Profile");
    root.setIcon(FontAwesome.USER);
    root.setWidth(100.0f, Unit.PERCENTAGE);
    root.setSpacing(true);
    root.setMargin(true);
    root.addStyleName("profile-form");

    VerticalLayout pic = new VerticalLayout();
    pic.setSizeUndefined();
    pic.setSpacing(true);
    Image profilePic = new Image(null, new ThemeResource("img/profile-pic-300px.jpg"));
    profilePic.setWidth(100.0f, Unit.PIXELS);
    pic.addComponent(profilePic);

    Button upload =
        new Button(
            "Change…",
            event -> {
              Notification.show("Not implemented in this demo");
            });
    upload.addStyleName(ValoTheme.BUTTON_TINY);
    pic.addComponent(upload);

    root.addComponent(pic);

    FormLayout details = new FormLayout();
    details.addStyleName(ValoTheme.FORMLAYOUT_LIGHT);
    root.addComponent(details);
    root.setExpandRatio(details, 1);

    firstNameField = new TextField("First Name");
    details.addComponent(firstNameField);
    lastNameField = new TextField("Last Name");
    details.addComponent(lastNameField);

    titleField = new ComboBox("Title");
    titleField.setInputPrompt("Please specify");
    titleField.addItem("Mr.");
    titleField.addItem("Mrs.");
    titleField.addItem("Ms.");
    titleField.setNewItemsAllowed(true);
    details.addComponent(titleField);

    sexField = new OptionGroup("Sex");
    sexField.addItem(Boolean.FALSE);
    sexField.setItemCaption(Boolean.FALSE, "Female");
    sexField.addItem(Boolean.TRUE);
    sexField.setItemCaption(Boolean.TRUE, "Male");
    sexField.addStyleName("horizontal");
    details.addComponent(sexField);

    Label section = new Label("Contact Info");
    section.addStyleName(ValoTheme.LABEL_H4);
    section.addStyleName(ValoTheme.LABEL_COLORED);
    details.addComponent(section);

    emailField = new TextField("Email");
    emailField.setWidth("100%");
    emailField.setRequired(true);
    emailField.setNullRepresentation("");
    details.addComponent(emailField);

    locationField = new TextField("Location");
    locationField.setWidth("100%");
    locationField.setNullRepresentation("");
    locationField.setComponentError(new UserError("This address doesn't exist"));
    details.addComponent(locationField);

    phoneField = new TextField("Phone");
    phoneField.setWidth("100%");
    phoneField.setNullRepresentation("");
    details.addComponent(phoneField);

    newsletterField = new OptionalSelect<>();
    newsletterField.addOption(0, "Daily");
    newsletterField.addOption(1, "Weekly");
    newsletterField.addOption(2, "Monthly");
    details.addComponent(newsletterField);

    section = new Label("Additional Info");
    section.addStyleName(ValoTheme.LABEL_H4);
    section.addStyleName(ValoTheme.LABEL_COLORED);
    details.addComponent(section);

    websiteField = new TextField("Website");
    websiteField.setInputPrompt("http://");
    websiteField.setWidth("100%");
    websiteField.setNullRepresentation("");
    details.addComponent(websiteField);

    bioField = new TextArea("Bio");
    bioField.setWidth("100%");
    bioField.setRows(4);
    bioField.setNullRepresentation("");
    details.addComponent(bioField);

    return root;
  }