org.springframework.messaging.handler.invocation

Interface HandlerMethodArgumentResolver

All Known Implementing Classes:

AbstractNamedValueMethodArgumentResolver, DestinationVariableMethodArgumentResolver, HandlerMethodArgumentResolverComposite, HeaderMethodArgumentResolver, HeadersMethodArgumentResolver, MessageMethodArgumentResolver, PayloadArgumentResolver, PrincipalMethodArgumentResolver

public interface HandlerMethodArgumentResolver

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

Since:

4.0

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method and Description
Object	resolveArgument(MethodParameter parameter, Message<?> message) Resolves a method parameter into an argument value from a given message.
boolean	supportsParameter(MethodParameter parameter) Whether the given method parameter is supported by this resolver.

Method Detail

supportsParameter

boolean supportsParameter(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

@Nullable
Object resolveArgument(MethodParameter parameter,
                                 Message<?> message)
                          throws Exception

Resolves a method parameter into an argument value from a given message.

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.

message - the currently processed message

Returns:

the resolved argument value, or null

Throws:

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