org.springframework.web.method.support
Class HandlerMethodArgumentResolverComposite

java.lang.Object
  org.springframework.web.method.support.HandlerMethodArgumentResolverComposite

All Implemented Interfaces:

HandlerMethodArgumentResolver

public class HandlerMethodArgumentResolverComposite
extends Object
implements HandlerMethodArgumentResolver

Resolves method parameters by delegating to a list of registered HandlerMethodArgumentResolvers. Previously resolved method parameters are cached for faster lookups.

Since:

3.1

Author:

Rossen Stoyanchev

Field Summary

protected Log

logger

Constructor Summary

HandlerMethodArgumentResolverComposite()

Method Summary

void	addResolver(HandlerMethodArgumentResolver argumentResolver) Add the given HandlerMethodArgumentResolver.
void	addResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) Add the given HandlerMethodArgumentResolvers.
Object	resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.
boolean	supportsParameter(MethodParameter parameter) Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

Constructor Detail

HandlerMethodArgumentResolverComposite

public HandlerMethodArgumentResolverComposite()

Method Detail

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

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

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

Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.

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) and it 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:

IllegalStateException - if no suitable HandlerMethodArgumentResolver is found.

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

addResolver

public void addResolver(HandlerMethodArgumentResolver argumentResolver)

Add the given HandlerMethodArgumentResolver.

addResolvers

public void addResolvers(List<HandlerMethodArgumentResolver> argumentResolvers)

Add the given HandlerMethodArgumentResolvers.