Package org.springframework.messaging.handler.invocation

Class HandlerMethodArgumentResolverComposite

java.lang.Object

org.springframework.messaging.handler.invocation.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:

4.0

Author:

Rossen Stoyanchev, Juergen Hoeller

Constructor Summary

Constructors

Constructor	Description
HandlerMethodArgumentResolverComposite()

Method Summary

Modifier and Type	Method	Description
HandlerMethodArgumentResolverComposite	addResolver(HandlerMethodArgumentResolver resolver)	Add the given HandlerMethodArgumentResolver.
HandlerMethodArgumentResolverComposite	addResolvers(@Nullable List<? extends HandlerMethodArgumentResolver> resolvers)	Add the given HandlerMethodArgumentResolvers.
HandlerMethodArgumentResolverComposite	addResolvers(@Nullable HandlerMethodArgumentResolver... resolvers)	Add the given HandlerMethodArgumentResolvers.
void	clear()	Clear the list of configured resolvers and the resolver cache.
List<HandlerMethodArgumentResolver>	getResolvers()	Return a read-only list with the contained resolvers, or an empty list.
@Nullable Object	resolveArgument(MethodParameter parameter, Message<?> message)	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

Constructor Details

HandlerMethodArgumentResolverComposite

public HandlerMethodArgumentResolverComposite()

Method Details

addResolver

public HandlerMethodArgumentResolverComposite addResolver(HandlerMethodArgumentResolver resolver)

Add the given HandlerMethodArgumentResolver.

addResolvers

public HandlerMethodArgumentResolverComposite addResolvers(@Nullable HandlerMethodArgumentResolver... resolvers)

Add the given HandlerMethodArgumentResolvers.

Since:

4.3

addResolvers

public HandlerMethodArgumentResolverComposite addResolvers(@Nullable List<? extends HandlerMethodArgumentResolver> resolvers)

Add the given HandlerMethodArgumentResolvers.

getResolvers

public List<HandlerMethodArgumentResolver> getResolvers()

Return a read-only list with the contained resolvers, or an empty list.

clear

public void clear()

Clear the list of configured resolvers and the resolver cache.

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 @Nullable Object resolveArgument(MethodParameter parameter,
 Message<?> message)
                                 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) which must have returned true.

message - the currently processed message

Returns:

the resolved argument value, or null

Throws:

IllegalArgumentException - if no suitable argument resolver is found

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