How to use

setThemeName

method

in

org.springframework.web.servlet.ThemeResolver

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
    throws ServletException {
  String newTheme = request.getParameter(this.paramName);
  if (newTheme != null) {
    ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(request);
    if (themeResolver == null) {
      throw new IllegalStateException("No ThemeResolver found: not in a DispatcherServlet request?");
    }
    themeResolver.setThemeName(request, response, newTheme);
  }
  // Proceed in any case.
  return true;
}

/**
 * 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(@Nullable 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;
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
    throws ServletException {
  String newTheme = request.getParameter(this.paramName);
  if (newTheme != null) {
    ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(request);
    if (themeResolver == null) {
      throw new IllegalStateException("No ThemeResolver found: not in a DispatcherServlet request?");
    }
    themeResolver.setThemeName(request, response, newTheme);
  }
  // Proceed in any case.
  return true;
}

/**
 * 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(@Nullable 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;
}

private void internalTest(ThemeResolver themeResolver, boolean shouldSet, String defaultName) {
  // create mocks
  MockServletContext context = new MockServletContext();
  MockHttpServletRequest request = new MockHttpServletRequest(context);
  MockHttpServletResponse response = new MockHttpServletResponse();
  // check original theme
  String themeName = themeResolver.resolveThemeName(request);
  assertEquals(themeName, defaultName);
  // set new theme name
  try {
    themeResolver.setThemeName(request, response, TEST_THEME_NAME);
    if (!shouldSet)
      fail("should not be able to set Theme name");
    // check new theme namelocale
    themeName = themeResolver.resolveThemeName(request);
    assertEquals(TEST_THEME_NAME, themeName);
    themeResolver.setThemeName(request, response, null);
    themeName = themeResolver.resolveThemeName(request);
    assertEquals(themeName, defaultName);
  }
  catch (UnsupportedOperationException ex) {
    if (shouldSet)
      fail("should be able to set Theme name");
  }
}

@Override
public void setThemeName(HttpServletRequest request, HttpServletResponse response, String themeName) {
  themeName = StringUtils.hasText(themeName) ? themeName : defaultTheme;
  
  for (ThemeResolver themeResolver : themeResolvers) {
    themeResolver.setThemeName(request, response, themeName);
  }
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
    throws ServletException {
  String newTheme = request.getParameter(this.paramName);
  if (newTheme != null) {
    ThemeResolver themeResolver = RequestContextUtils.getThemeResolver(request);
    if (themeResolver == null) {
      throw new IllegalStateException("No ThemeResolver found: not in a DispatcherServlet request?");
    }
    themeResolver.setThemeName(request, response, newTheme);
  }
  // Proceed in any case.
  return true;
}

/**
 * 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;
}

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException {
    String newTheme = request.getParameter(getParamName());
    if (newTheme != null) {
      ThemeResolver themeResolver = cookieThemeResolver();
      if (themeResolver != null) {
        themeResolver.setThemeName(request, response, newTheme);
      }
    }
    return true;
  }
};

/**
 * 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(@Nullable 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;
}

@Override
public void setThemeName(HttpServletRequest request, HttpServletResponse response, String themeName) {
  if (isNested()) {
    for (ThemeResolver localeResolver : getResolvers()) {
      localeResolver.setThemeName(request, response, themeName);
    }
  }
}

public void setThemeName(HttpServletRequest request,
             HttpServletResponse response, String themeName) {
  ThemeResolver themeResolver = RequestInstanceHolder
      .getMappingInstance().getCommonThemeResolver();
  if (themeResolver != null) {
    logger.logMessage(LogLevel.DEBUG,
        " invoke themeResolver.setThemeName() method that will proxy ["
            + themeResolver + "]");
    themeResolver.setThemeName(request, response, themeName);
  }
}

themeResolver.setThemeName(request, response, newTheme);

@Override
public void postHandle(HttpServletRequest request,
    HttpServletResponse response, Object handler,
    ModelAndView modelAndView) throws Exception {
  Locale locale = localeResolver.resolveLocale(request);
  userSettingsHolder.setLocale(locale);
  localeResolver.setLocale(request, response, locale);
  String themeName = themeResolver.resolveThemeName(request);
  userSettingsHolder.setTheme(themeName);
  themeResolver.setThemeName(request, response, themeName);
  final String timezone = timezoneResolver.resolveSetting(request);
  userSettingsHolder.setTimezone(timezone);
  timezoneResolver.setSetting(timezone);
}