public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws ServletException {
boolean result = super.preHandle(request, response, handler);
ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(request);
String newTheme = themeResolver.resolveThemeName(request);
if (!validThemes.contains(newTheme)) {
// not found.
logger.error("Invalid theme passed in: " + newTheme);
try {
response.sendRedirect("accessDenied.jsp");
return false;
} catch (IOException e) {
throw new ServletException("Could not redirect to accessDenied page.", e);
}
} else if (request.getParameter(this.paramName) != null) {
// found. redirect to page without "param=.." extension.
logger.warn("New theme set: " + newTheme + ". Redirecting to login.htm");
try {
response.sendRedirect("login.htm");
} catch (IOException e) {
throw new ServletException("Could not redirect to login page.", e);
}
}
return result;
}
/**
* Change the current theme to the specified theme by name, storing the new theme name through the
* configured {@link ThemeResolver}.
*
* @param themeName the name of the new theme
* @see ThemeResolver#setThemeName
*/
public void changeTheme(String themeName) {
ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(this.request);
if (themeResolver == null) {
throw new IllegalStateException("Cannot change theme if no ThemeResolver configured");
}
themeResolver.setThemeName(this.request, this.response, themeName);
// Ask for re-resolution on next getTheme call.
this.theme = null;
}
/**
* Change the current theme to the specified one, storing the new theme name through the
* configured {@link ThemeResolver}.
*
* @param theme the new theme
* @see ThemeResolver#setThemeName
*/
public void changeTheme(Theme theme) {
ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(this.request);
if (themeResolver == null) {
throw new IllegalStateException("Cannot change theme if no ThemeResolver configured");
}
themeResolver.setThemeName(
this.request, this.response, (theme != null ? theme.getName() : null));
this.theme = theme;
}