/**
* Returns the id of the currently active theme.
*
* @return the id of the current theme, never <code>null</code>
*/
public static String getCurrentThemeId() {
ThemeManager manager = ThemeManager.getInstance();
ISessionStore session = ContextProvider.getSession();
// 1) try URL parameter
String result = ContextProvider.getRequest().getParameter(THEME_URL_PARM);
if (result != null && manager.hasTheme(result)) {
// TODO [rh] a method named get... should be constant, i.e. shouldn't
// have side-effects like altering session attributes
session.setAttribute(CURR_THEME_ATTR, result);
}
// 2) try session attribute
else {
result = (String) session.getAttribute(CURR_THEME_ATTR);
}
// 3) use default
if (result == null) {
result = ThemeManager.DEFAULT_THEME_ID;
}
return result;
}
/**
* Sets the current theme to the theme identified by the given id.
*
* @param themeId the id of the theme to activate
* @throws IllegalArgumentException if no theme with the given id is registered
*/
public static void setCurrentThemeId(final String themeId) {
if (!ThemeManager.getInstance().hasTheme(themeId)) {
throw new IllegalArgumentException("Illegal theme id: " + themeId);
}
ContextProvider.getSession().setAttribute(CURR_THEME_ATTR, themeId);
}