Example usage for com.vaadin.ui HasComponents getLocale

Introduction

In this page you can find the example usage for com.vaadin.ui HasComponents getLocale.

Prototype

public Locale getLocale();

Source Link

Document

Gets the locale of the component.

Usage

From source file:com.validation.manager.core.VaadinUtils.java

License:Apache License

/**
 * Change all {@code Locale} dependant properties of the
 * {@code com.vaadin.ui.Component}s within of the given component container
 * (typically an {@link UI} or other top level layout component). If the
 * specified {@code Locale} is the same as the current {@code Locale} of the
 * component container, this method does nothing. Otherwise it'll go thru
 * the components searching for it's component id. If it is in the resource
 * bundle, it'll set it's caption to the right translated string.
 *
 * <p>/*from   w ww . java 2 s  .com*/
 * To use this method, do something like:
 * <pre>
 * public class MyUI extends UI {
 *
 *     {@literal @}Override
 *     public void init(final VaadinRequest request) {
 *         // ... usual code
 *         // somewhere in the UI the user can change the "Form Locale". This code must
 *         // call myUI#setLocale(newLocale);
 *     }
 *
 *     // ...
 *
 * }
 *
 *      String key = "demo.tab.message";
 *      VerticalLayout vl = new VerticalLayout();
 *      Button b = new Button(key);
 *      vl.addComponent(b);
 *      ResourceBundle rb = ResourceBundle.getBundle(
 *              "resource.bundle",
 *              new Locale("es"));
 *      VaadinUtils.updateLocale(vl, new Locale("es"), rb);
 *
 *      It also works with components implementing Property:
 *
 *      VerticalLayout vl = new VerticalLayout();
 *      Label l = new Label(key);
 *      vl.addComponent(l);
 *      ResourceBundle rb = ResourceBundle.getBundle(
 *              "resource.bundle",
 *              new Locale("es"));
 *      VaadinUtils.updateLocale(vl, new Locale("es"), rb);
 * </pre>
 *
 * @param ui The component container for which the {@code Locale} dependent
 * component properties must be changed, never {@code null}
 * @param locale The new {@code Locale}, never {@code null}
 * @param rb The {@code ResourceBundle} for the specified {@code Locale},
 * never {@code null}
 */
public static void updateLocale(final HasComponents ui, final Locale locale, final ResourceBundle rb) {

    // locale may not be null, however the current UI Locale may be null!
    if (locale.equals(ui.getLocale())) {
        return;
    }
    final long time = System.currentTimeMillis();
    walkComponentTree(ui, (Component c) -> {
        String id = c.getId();
        String caption;
        if (c instanceof Property && ((Property) c).getValue() instanceof String) {
            caption = (String) ((Property) c).getValue();
        } else {
            caption = c.getCaption();
        }
        if (id != null && !id.trim().isEmpty()) {
            if (rb.containsKey(id)) {
                try {
                    c.setCaption(new String(rb.getString(id).getBytes("ISO-8859-1"), "UTF-8"));
                } catch (UnsupportedEncodingException ex) {
                    LOG.log(Level.SEVERE, null, ex);
                }
            }
        } else if (caption != null && !caption.trim().isEmpty()) {
            /**
             * This is a more complex scenario where the caption uses more
             * than one key for translation. Sort the keys in reverse so
             * substitutions are correct.
             */
            final SortedSet<String> ss = new TreeSet<>(Collections.reverseOrder());
            for (Enumeration<String> e = rb.getKeys(); e.hasMoreElements();) {
                try {
                    String key = e.nextElement();
                    ss.add(key);
                    caption = caption.replaceAll(key,
                            new String(rb.getString(key).getBytes("ISO-8859-1"), "UTF-8"));
                } catch (UnsupportedEncodingException ex) {
                    LOG.log(Level.SEVERE, null, ex);
                }
            }
            if (c instanceof Property) {
                ((Property) c).setValue(caption);
            } else {
                c.setCaption(caption);
            }
        }
    });
    LOG.log(Level.FINE, "Locale updated: {0} -> {1} in {2} ms.",
            new Object[] { ui.getLocale(), locale, System.currentTimeMillis() - time });
}

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