org.springframework.web.method.support

Interface HandlerMethodArgumentResolver

All Known Implementing Classes:

AbstractCookieValueMethodArgumentResolver, AbstractNamedValueMethodArgumentResolver, AbstractWebArgumentResolverAdapter, ErrorsMethodArgumentResolver, ExpressionValueMethodArgumentResolver, HandlerMethodArgumentResolverComposite, MapMethodProcessor, ModelAttributeMethodProcessor, ModelMethodProcessor, RequestHeaderMapMethodArgumentResolver, RequestHeaderMethodArgumentResolver, RequestParamMapMethodArgumentResolver, RequestParamMethodArgumentResolver, SessionStatusMethodArgumentResolver

public interface HandlerMethodArgumentResolver

Strategy interface for resolving method parameters into argument values in the context of a given request.

Since:

3.1

Author:

Arjen Poutsma

See Also:

HandlerMethodReturnValueHandler

Method Summary

Modifier and Type	Method and Description
Object	resolveArgument(org.springframework.core.MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) Resolves a method parameter into an argument value from a given request.
boolean	supportsParameter(org.springframework.core.MethodParameter parameter) Whether the given method parameter is supported by this resolver.

Method Detail

supportsParameter

boolean supportsParameter(org.springframework.core.MethodParameter parameter)

Whether the given method parameter is supported by this resolver.

Parameters:

parameter - the method parameter to check

Returns:

true if this resolver supports the supplied parameter; false otherwise

resolveArgument

Object resolveArgument(org.springframework.core.MethodParameter parameter,
                       ModelAndViewContainer mavContainer,
                       NativeWebRequest webRequest,
                       WebDataBinderFactory binderFactory)
                throws Exception

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.

Parameters:

parameter - the method parameter to resolve. This parameter must have previously been passed to 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

Throws:

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