package org.argeo.cms.e4.addons;
   
   import java.security.AccessController;
   import java.util.List;
   import java.util.Locale;
   import java.util.Set;
   
   import javax.annotation.PostConstruct;
   import javax.security.auth.Subject;
  
  import org.argeo.eclipse.ui.specific.UiContext;
  import org.eclipse.e4.core.services.nls.ILocaleChangeService;
  import org.eclipse.e4.ui.model.application.MApplication;
  import org.eclipse.e4.ui.model.application.ui.basic.MWindow;
  import org.eclipse.e4.ui.workbench.modeling.EModelService;
  import org.eclipse.e4.ui.workbench.modeling.ElementMatcher;
  import org.eclipse.swt.SWT;
  
  /** Integrate workbench with the locale provided at log in. */
  public class LocaleAddon {
  	private final static String STYLE_OVERRIDE = "styleOverride";
  
  	// Right to left languages
  	private final static String ARABIC = "ar";
  	private final static String HEBREW = "he";
  
  	@PostConstruct
  	public void init(ILocaleChangeService localeChangeService, EModelService modelService, MApplication application) {
  		Subject subject = Subject.getSubject(AccessController.getContext());
  		Set<Locale> locales = subject.getPublicCredentials(Locale.class);
  		if (!locales.isEmpty()) {
  			Locale locale = locales.iterator().next();
  			localeChangeService.changeApplicationLocale(locale);
  			UiContext.setLocale(locale);
  
  			if (locale.getLanguage().equals(ARABIC) || locale.getLanguage().equals(HEBREW)) {
  				List<MWindow> windows = modelService.findElements(application, MWindow.class, EModelService.ANYWHERE,
  						new ElementMatcher(null, null, (String) null));
  				for (MWindow window : windows) {
  					String currentStyle = window.getPersistedState().get(STYLE_OVERRIDE);
  					int style = 0;
  					if (currentStyle != null) {
  						style = Integer.parseInt(currentStyle);
  					}
  					style = style | SWT.RIGHT_TO_LEFT;
  					window.getPersistedState().put(STYLE_OVERRIDE, Integer.toString(style));
  				}
  			}
  		}
  	}
  }