org.springframework.web.portlet.handler
Class ParameterMappingInterceptor

java.lang.Object
  org.springframework.web.portlet.handler.HandlerInterceptorAdapter
      org.springframework.web.portlet.handler.ParameterMappingInterceptor

All Implemented Interfaces:

HandlerInterceptor

public class ParameterMappingInterceptor
extends HandlerInterceptorAdapter

Interceptor to forward a request parameter from the ActionRequest to the RenderRequest.

This can be useful when using ParameterHandlerMapping or PortletModeParameterHandlerMapping. It will ensure that the parameter that was used to map the ActionRequest to a handler will be forwarded to the RenderRequest so that it will also be mapped the same way.

When using this Interceptor, you can still change the value of the mapping parameter in your handler in order to change where the render request will get mapped.

Be aware that this Interceptor does call ActionResponse.setRenderParameter, which means that you will not be able to call ActionResponse.sendRedirect in your handler. If you may need to issue a redirect, then you should avoid this Interceptor and either write a different one that does this in a different way, or manually forward the parameter from within your handler(s).

Thanks to Rainer Schmitz for suggesting this mapping strategy!

Since:

2.0

Author:

John A. Lewis

See Also:

ParameterHandlerMapping, PortletModeParameterHandlerMapping

Field Summary

static String

DEFAULT_PARAMETER_NAME Request parameter name to use for mapping to handlers

Constructor Summary

ParameterMappingInterceptor()

Method Summary

boolean	preHandleAction(ActionRequest request, ActionResponse response, Object handler) If request is an ActionRequest, get handler mapping parameter and add it to the ActionResponse.
void	setParameterName(String parameterName) Set the name of the parameter used for mapping.

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

afterActionCompletion, afterCompletion, afterEventCompletion, afterRenderCompletion, afterResourceCompletion, postHandleRender, postHandleResource, preHandle, preHandleEvent, preHandleRender, preHandleResource

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PARAMETER_NAME

public static final String DEFAULT_PARAMETER_NAME

Request parameter name to use for mapping to handlers

See Also:

Constant Field Values

Constructor Detail

ParameterMappingInterceptor

public ParameterMappingInterceptor()

Method Detail

setParameterName

public void setParameterName(String parameterName)

Set the name of the parameter used for mapping.

preHandleAction

public boolean preHandleAction(ActionRequest request,
                               ActionResponse response,
                               Object handler)

If request is an ActionRequest, get handler mapping parameter and add it to the ActionResponse.

Specified by:

preHandleAction in interface HandlerInterceptor

Overrides:

preHandleAction in class HandlerInterceptorAdapter

Parameters:

request - current portlet action request

response - current portlet action response

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

Returns:

true if the execution chain should proceed with the next interceptor or the handler itself. Else, DispatcherPortlet assumes that this interceptor has already dealt with the response itself