java.lang.Object
- org.springframework.messaging.handler.annotation.support.MessageMethodArgumentResolver

All Implemented Interfaces:
HandlerMethodArgumentResolver
```
public class MessageMethodArgumentResolver
extends Object
implements HandlerMethodArgumentResolver
```
HandlerMethodArgumentResolver for Message method arguments. Validates that the generic type of the payload matches to the message value or otherwise applies MessageConverter to convert to the expected payload type.
Since:
4.0
Author:
Rossen Stoyanchev, Stephane Nicoll, Juergen Hoeller

Constructor Summary

Constructors
Constructor	Description
`MessageMethodArgumentResolver()`	Create a default resolver instance without message conversion.
`MessageMethodArgumentResolver(MessageConverter converter)`	Create a resolver instance with the given `MessageConverter`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected Class<?>`	`getPayloadType(MethodParameter parameter, Message<?> message)`	Resolve the target class to convert the payload to.
`protected boolean`	`isEmptyPayload(Object payload)`	Check if the given `payload` is empty.
`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MessageMethodArgumentResolver
```
public MessageMethodArgumentResolver()
```
    Create a default resolver instance without message conversion.
  - MessageMethodArgumentResolver
```
public MessageMethodArgumentResolver(@Nullable
                                     MessageConverter converter)
```
    Create a resolver instance with the given MessageConverter.
    Parameters:
    converter - the MessageConverter to use (may be null)
    Since:
    4.3
- Method Detail
  - 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
```
public Object resolveArgument(MethodParameter parameter,
                              Message<?> message)
                       throws Exception
```
    Description copied from interface: HandlerMethodArgumentResolver
    Resolves a method parameter into an argument value from a given message.
    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:
    Exception - in case of errors with the preparation of argument values
  - getPayloadType
```
protected Class<?> getPayloadType(MethodParameter parameter,
                                  Message<?> message)
```
    Resolve the target class to convert the payload to.
    By default this is the generic type declared in the Message method parameter but that can be overridden to select a more specific target type after also taking into account the "Content-Type", e.g. return String if target type is Object and "Content-Type:text/**".
    Parameters:
    parameter - the target method parameter
    message - the message being processed
    Returns:
    the target type to use
    Since:
    5.2
  - isEmptyPayload
```
protected boolean isEmptyPayload(@Nullable
                                 Object payload)
```
    Check if the given payload is empty.
    Parameters:
    payload - the payload to check (can be null)

Class MessageMethodArgumentResolver

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

MessageMethodArgumentResolver

MessageMethodArgumentResolver

Method Detail

supportsParameter

resolveArgument

getPayloadType

isEmptyPayload