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## org.springframework.web.portlet.handler
Class WebRequestHandlerInterceptorAdapter

    java.lang.Object
      org.springframework.web.portlet.handler.WebRequestHandlerInterceptorAdapter

All Implemented Interfaces:
  HandlerInterceptor

    public class WebRequestHandlerInterceptorAdapter

extends Object
implements HandlerInterceptor

Adapter that implements the Portlet HandlerInterceptor interface and wraps an underlying WebRequestInterceptor.

NOTE: The WebRequestInterceptor is by default only applied to the Portlet render phase, which is dealing with preparing and rendering a Portlet view. The Portlet action phase will only be intercepted with WebRequestInterceptor calls if the `renderPhaseOnly` flag is explicitly set to `false`. In general, it is recommended to use the Portlet-specific HandlerInterceptor mechanism for differentiating between action and render interception.

Since:
  2.0
Author:
  Juergen Hoeller
See Also:
  `WebRequestInterceptor`, `HandlerInterceptor`

Constructor Summary
`WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor)` Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor, applying to the render phase only.
`WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor, boolean renderPhaseOnly)` Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor.

Method Summary
`void` | `afterActionCompletion(ActionRequest request, ActionResponse response, Object handler, Exception ex)` Callback after completion of request processing in the action phase, that is, after rendering the view.
`void` | `afterRenderCompletion(RenderRequest request, RenderResponse response, Object handler, Exception ex)` Callback after completion of request processing, that is, after rendering the view.
`void` | `postHandleRender(RenderRequest request, RenderResponse response, Object handler, ModelAndView modelAndView)` Intercept the execution of a handler in the render phase.
`boolean` | `preHandleAction(ActionRequest request, ActionResponse response, Object handler)` Intercept the execution of a handler in the action phase.
`boolean` | `preHandleRender(RenderRequest request, RenderResponse response, Object handler)` Intercept the execution of a handler in the render phase.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### WebRequestHandlerInterceptorAdapter

    public WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor)

  Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor, applying to the render phase only.

  Parameters:
    `requestInterceptor` - the WebRequestInterceptor to wrap

### WebRequestHandlerInterceptorAdapter

    public WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor,
                                               boolean renderPhaseOnly)

  Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor.

  Parameters:
    `requestInterceptor` - the WebRequestInterceptor to wrap
    `renderPhaseOnly` - whether to apply to the render phase only (`true`) or to the action phase as well (`false`)

Method Detail

### preHandleAction

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

  Description copied from interface: `HandlerInterceptor`
  Intercept the execution of a handler in the action phase.

  Called after a HandlerMapping determines an appropriate handler object to handle an `ActionRequest`, but before said HandlerAdapter actually invokes the handler.

  `DispatcherPortlet` processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can decide to abort the execution chain, typically throwing an exception or writing a custom response.

  Specified by:
    `preHandleAction` in interface `HandlerInterceptor`
  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
  Throws:
    `Exception` - in case of errors

### afterActionCompletion

    public void afterActionCompletion(ActionRequest request,
                                      ActionResponse response,
                                      Object handler,
                                      Exception ex)
                               throws Exception

  Description copied from interface: `HandlerInterceptor`
  Callback after completion of request processing in the action phase, that is, after rendering the view. Will be called on any outcome of handler execution, thus allowing for proper resource cleanup.

  Note: Will only be called if this interceptor's `HandlerInterceptor.preHandleAction(javax.portlet.ActionRequest, javax.portlet.ActionResponse, Object)` method has successfully completed and returned `true`!

  Specified by:
    `afterActionCompletion` in interface `HandlerInterceptor`
  Parameters:
    `request` - current portlet action request
    `response` - current portlet action response
    `handler` - chosen handler to execute, for type and/or instance examination
    `ex` - exception thrown on handler execution, if any (only included as additional context information for the case where a handler threw an exception; request execution may have failed even when this argument is `null`)
  Throws:
    `Exception` - in case of errors

### preHandleRender

    public boolean preHandleRender(RenderRequest request,
                                   RenderResponse response,
                                   Object handler)
                            throws Exception

  Description copied from interface: `HandlerInterceptor`
  Intercept the execution of a handler in the render phase.

  Called after a HandlerMapping determines an appropriate handler object to handle a `RenderRequest`, but before said HandlerAdapter actually invokes the handler.

  `DispatcherPortlet` processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can decide to abort the execution chain, typically throwing an exception or writing a custom response.

  Specified by:
    `preHandleRender` in interface `HandlerInterceptor`
  Parameters:
    `request` - current portlet render request
    `response` - current portlet render 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
  Throws:
    `Exception` - in case of errors

### postHandleRender

    public void postHandleRender(RenderRequest request,
                                 RenderResponse response,
                                 Object handler,
                                 ModelAndView modelAndView)
                          throws Exception

  Description copied from interface: `HandlerInterceptor`
  Intercept the execution of a handler in the render phase.

  Called after a `HandlerAdapter` actually invoked the handler, but before the `DispatcherPortlet` renders the view. Can thus expose additional model objects to the view via the given `ModelAndView`.

  `DispatcherPortlet` processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can post-process an execution, getting applied in inverse order of the execution chain.

  Specified by:
    `postHandleRender` in interface `HandlerInterceptor`
  Parameters:
    `request` - current portlet render request
    `response` - current portlet render response
    `handler` - chosen handler to execute, for type and/or instance examination
    `modelAndView` - the `ModelAndView` that the handler returned (can also be `null`)
  Throws:
    `Exception` - in case of errors

### afterRenderCompletion

    public void afterRenderCompletion(RenderRequest request,
                                      RenderResponse response,
                                      Object handler,
                                      Exception ex)
                               throws Exception

  Description copied from interface: `HandlerInterceptor`
  Callback after completion of request processing, that is, after rendering the view. Will be called on any outcome of handler execution, thus allowing for proper resource cleanup.

  Note: Will only be called if this interceptor's `HandlerInterceptor.preHandleRender(javax.portlet.RenderRequest, javax.portlet.RenderResponse, Object)` method has successfully completed and returned `true`!

  Specified by:
    `afterRenderCompletion` in interface `HandlerInterceptor`
  Parameters:
    `request` - current portlet render request
    `response` - current portlet render response
    `handler` - chosen handler to execute, for type and/or instance examination
    `ex` - exception thrown on handler execution, if any
  Throws:
    `Exception` - in case of errors

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