ThemeResolver (Spring Framework 4.3.30.RELEASE API)

All Known Implementing Classes:
AbstractThemeResolver, CookieThemeResolver, FixedThemeResolver, SessionThemeResolver
```
public interface ThemeResolver
```
Interface for web-based theme resolution strategies that allows for both theme resolution via the request and theme modification via request and response.
This interface allows for implementations based on session, cookies, etc. The default implementation is FixedThemeResolver, simply using a configured default theme.
Note that this resolver is only responsible for determining the current theme name. The Theme instance for the resolved theme name gets looked up by DispatcherServlet via the respective ThemeSource, i.e. the current WebApplicationContext.
Use RequestContext.getTheme() to retrieve the current theme in controllers or views, independent of the actual resolution strategy.
Since:
17.06.2003
Author:
Jean-Pierre Pawlak, Juergen Hoeller
See Also:
Theme, ThemeSource

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`resolveThemeName(HttpServletRequest request)`	Resolve the current theme name via the given request.
`void`	`setThemeName(HttpServletRequest request, HttpServletResponse response, String themeName)`	Set the current theme name to the given one.

- Method Detail
  - resolveThemeName
```
String resolveThemeName(HttpServletRequest request)
```
    Resolve the current theme name via the given request. Should return a default theme as fallback in any case.
    Parameters:
    request - request to be used for resolution
    Returns:
    the current theme name
  - setThemeName
```
void setThemeName(HttpServletRequest request,
                  HttpServletResponse response,
                  String themeName)
```
    Set the current theme name to the given one.
    Parameters:
    request - request to be used for theme name modification
    response - response to be used for theme name modification
    themeName - the new theme name
    Throws:
    UnsupportedOperationException - if the ThemeResolver implementation does not support dynamic changing of the theme