com.interface21.web.servlet.theme
Class ThemeChangeInterceptor

java.lang.Object
  |
  +--com.interface21.web.servlet.theme.ThemeChangeInterceptor

All Implemented Interfaces:

HandlerInterceptor

public class ThemeChangeInterceptor

extends java.lang.Object

implements HandlerInterceptor

Interceptor that allows for changing the current theme on every request, via a configurable request parameter.

Since:

20.06.2003

Author:

Juergen Hoeller

See Also:

ThemeResolver

Field Summary

static java.lang.String

DEFAULT_PARAM_NAME

Constructor Summary

ThemeChangeInterceptor()

Method Summary

boolean	preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.Object handler) Intercept the execution of a handler.
void	setParamName(java.lang.String paramName) Set the name of the parameter that contains a theme specification in a theme change request.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_PARAM_NAME

public static final java.lang.String DEFAULT_PARAM_NAME

Constructor Detail

ThemeChangeInterceptor

public ThemeChangeInterceptor()

Method Detail

setParamName

public void setParamName(java.lang.String paramName)

Set the name of the parameter that contains a theme specification in a theme change request. Default is "theme".

preHandle

public boolean preHandle(javax.servlet.http.HttpServletRequest request,
                         javax.servlet.http.HttpServletResponse response,
                         java.lang.Object handler)
                  throws javax.servlet.ServletException

Description copied from interface: HandlerInterceptor

Intercept the execution of a handler. Called after HandlerMapping determined an appropriate handler object, but before HandlerAdapter invokes the handler.

DispatcherServlet processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. Each interceptor can decide to abort the execution chain, typically sending a HTTP error or writing a custom response.

Specified by:

preHandle in interface HandlerInterceptor

Following copied from interface: com.interface21.web.servlet.HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - chosen handler to execute, for type and/or instance evaluation

Returns:

if the execution chain should proceed with the next interceptor resp. the handler itself, else DispatcherServlet assumes that this interceptor has already dealed with the response

Throws:

javax.servlet.ServletException - if there is an internal error

java.io.IOException - in case of an I/O error when writing the response