Package org.springframework.web.method.support

Interface HandlerMethodReturnValueHandler

All Known Subinterfaces:

AsyncHandlerMethodReturnValueHandler

All Known Implementing Classes:

AbstractMessageConverterMethodProcessor, AsyncTaskMethodReturnValueHandler, CallableMethodReturnValueHandler, DeferredResultMethodReturnValueHandler, HandlerMethodReturnValueHandlerComposite, HttpEntityMethodProcessor, HttpHeadersReturnValueHandler, MapMethodProcessor, ModelAndViewMethodReturnValueHandler, ModelAndViewResolverMethodReturnValueHandler, ModelAttributeMethodProcessor, ModelMethodProcessor, RequestResponseBodyMethodProcessor, ResponseBodyEmitterReturnValueHandler, ServletModelAttributeMethodProcessor, StreamingResponseBodyReturnValueHandler, ViewMethodReturnValueHandler, ViewNameMethodReturnValueHandler

public interface HandlerMethodReturnValueHandler

Strategy interface to handle the value returned from the invocation of a handler method.

Since:

3.1

Author:

Arjen Poutsma

See Also:

• HandlerMethodArgumentResolver

Method Summary

Modifier and Type	Method	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.
boolean	supportsReturnType(MethodParameter returnType)	Whether the given method return type is supported by this handler.

Method Details

supportsReturnType

boolean supportsReturnType(MethodParameter returnType)

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

Parameters:

returnType - the method return type to check

Returns:

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

handleReturnValue

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

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.

Parameters:

returnValue - the value returned from the handler method

returnType - the type of the return value. This type must have previously been passed to supportsReturnType(org.springframework.core.MethodParameter) which 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