Package org.springframework.web.method.annotation

Class ModelMethodProcessor

java.lang.Object

org.springframework.web.method.annotation.ModelMethodProcessor

All Implemented Interfaces:

HandlerMethodArgumentResolver, HandlerMethodReturnValueHandler

public class ModelMethodProcessor
extends Object
implements HandlerMethodArgumentResolver, HandlerMethodReturnValueHandler

Resolves Model arguments and handles Model return values.

A Model return type has a set purpose. Therefore this handler should be configured ahead of handlers that support any return value type annotated with @ModelAttribute or @ResponseBody to ensure they don't take over.

Since:

3.1

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
ModelMethodProcessor()

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.
Object	resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory)	Resolves a method parameter into an argument value from a given request.
boolean	supportsParameter(MethodParameter parameter)	Whether the given method parameter is supported by this resolver.
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 Details

ModelMethodProcessor

public ModelMethodProcessor()

Method Details

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Description copied from interface: HandlerMethodArgumentResolver

Whether the given method parameter is supported by this resolver.

Specified by:

supportsParameter in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to check

Returns:

true if this resolver supports the supplied parameter; false otherwise

resolveArgument

@Nullable
public Object resolveArgument(MethodParameter parameter,
 @Nullable
 ModelAndViewContainer mavContainer,
 NativeWebRequest webRequest,
 @Nullable
 WebDataBinderFactory binderFactory)
                       throws Exception

Description copied from interface: HandlerMethodArgumentResolver

Resolves a method parameter into an argument value from a given request. A ModelAndViewContainer provides access to the model for the request. A WebDataBinderFactory provides a way to create a WebDataBinder instance when needed for data binding and type conversion purposes.

Specified by:

resolveArgument in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to resolve. This parameter must have previously been passed to HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter) which must have returned true.

mavContainer - the ModelAndViewContainer for the current request

webRequest - the current request

binderFactory - a factory for creating WebDataBinder instances

Returns:

the resolved argument value, or null if not resolvable

Throws:

Exception - in case of errors with the preparation of argument values

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(@Nullable
 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) 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