org.springframework.web.servlet.mvc.method.annotation

Class ViewNameMethodReturnValueHandler

java.lang.Object

org.springframework.web.servlet.mvc.method.annotation.ViewNameMethodReturnValueHandler

All Implemented Interfaces:

HandlerMethodReturnValueHandler

public class ViewNameMethodReturnValueHandler
extends Object
implements HandlerMethodReturnValueHandler

Handles return values of types void and String interpreting them as view name reference.

A null return value, either due to a void return type or as the actual return value is left as-is allowing the configured RequestToViewNameTranslator to select a view name by convention.

A String return value can be interpreted in more than one ways depending on the presence of annotations like @ModelAttribute or @ResponseBody. Therefore this handler should be configured after the handlers that support these annotations.

Since:

3.1

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor and Description
ViewNameMethodReturnValueHandler()

Method Summary

Methods

Modifier and Type	Method and Description
void	handleReturnValue(Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer, NativeWebRequest webRequest) Handle the given return value by adding attributes to the model and setting a view or setting the ModelAndViewContainer.setRequestHandled(boolean) flag to true to indicate the response has been handled directly.
protected boolean	isRedirectViewName(String viewName) Whether the given view name is a redirect view reference.
boolean	supportsReturnType(MethodParameter returnType) Whether the given method return type is supported by this handler.

Methods inherited from class java.lang.Object

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

Constructor Detail

ViewNameMethodReturnValueHandler

public ViewNameMethodReturnValueHandler()

Method Detail

supportsReturnType

public boolean supportsReturnType(MethodParameter returnType)

Description copied from interface: HandlerMethodReturnValueHandler

Whether the given method return type is supported by this handler.

Specified by:

supportsReturnType in interface HandlerMethodReturnValueHandler

Parameters:

returnType - the method return type to check

Returns:

true if this handler supports the supplied return type; false otherwise

handleReturnValue

public void handleReturnValue(Object returnValue,
                     MethodParameter returnType,
                     ModelAndViewContainer mavContainer,
                     NativeWebRequest webRequest)
                       throws Exception

Description copied from interface: HandlerMethodReturnValueHandler

Handle the given return value by adding attributes to the model and setting a view or setting the ModelAndViewContainer.setRequestHandled(boolean) flag to true to indicate the response has been handled directly.

Specified by:

handleReturnValue in interface HandlerMethodReturnValueHandler

Parameters:

returnValue - the value returned from the handler method

returnType - the type of the return value. This type must have previously been passed to HandlerMethodReturnValueHandler.supportsReturnType(org.springframework.core.MethodParameter) and it must have returned true

mavContainer - the ModelAndViewContainer for the current request

webRequest - the current request

Throws:

Exception - if the return value handling results in an error

isRedirectViewName

protected boolean isRedirectViewName(String viewName)

Whether the given view name is a redirect view reference.

Parameters:

viewName - the view name to check, never null

Returns:

"true" if the given view name is recognized as a redirect view reference; "false" otherwise.