org.riotfamily.website.interceptor
Class PushUpInterceptor

java.lang.Object
  org.springframework.web.servlet.handler.HandlerInterceptorAdapter
      org.riotfamily.website.interceptor.PushUpInterceptor

All Implemented Interfaces:

HandlerInterceptor

public class PushUpInterceptor
extends HandlerInterceptorAdapter

HandlerInterceptor that allows an included controller to handle the request before any other controller is executed. This is useful if an included controller needs to send a redirect, which would not work under normal circumstances, since the response would have already been committed.

The interceptor looks for a special request parameter which contains the URI of the controller that should handle the request in the fist place. If such a parameter is present, the interceptor will use a RequestDispatcher to forward the request to that URI. For this forward the response is replaced by a wrapper that captures the output and checks whether a redirect or error has been sent. If yes, the interceptor prevents the execution of the actual handler. Otherwise the execution continues and the captured output is rendered when the controller is requested for the second time.

Field Summary

static String

INCLUDE_URI_PARAM

Constructor Summary

PushUpInterceptor()

Method Summary

protected boolean	handleFirstInclude(Object handler, HttpServletRequest request)
protected boolean	handleSubsequentInclude(Object handler, Object firstHandler, HttpServletRequest request, HttpServletResponse response)
protected boolean	handleUnknown(HttpServletRequest request, HttpServletResponse response)
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

Methods inherited from class org.springframework.web.servlet.handler.HandlerInterceptorAdapter

afterCompletion, postHandle

Methods inherited from class java.lang.Object

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

Field Detail

INCLUDE_URI_PARAM

public static final String INCLUDE_URI_PARAM

See Also:

Constant Field Values

Constructor Detail

PushUpInterceptor

public PushUpInterceptor()

Method Detail

preHandle

public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response,
                         Object handler)
                  throws Exception

Specified by:

preHandle in interface HandlerInterceptor

Overrides:

preHandle in class HandlerInterceptorAdapter

Throws:

Exception

handleUnknown

protected boolean handleUnknown(HttpServletRequest request,
                                HttpServletResponse response)
                         throws Exception

Throws:

Exception

handleFirstInclude

protected boolean handleFirstInclude(Object handler,
                                     HttpServletRequest request)

handleSubsequentInclude

protected boolean handleSubsequentInclude(Object handler,
                                          Object firstHandler,
                                          HttpServletRequest request,
                                          HttpServletResponse response)
                                   throws IOException

Throws:

IOException