java.lang.Object
- org.springframework.messaging.handler.annotation.reactive.AbstractNamedValueMethodArgumentResolver
- - org.springframework.messaging.handler.annotation.reactive.HeaderMethodArgumentResolver

All Implemented Interfaces:
HandlerMethodArgumentResolver, SyncHandlerMethodArgumentResolver
```
public class HeaderMethodArgumentResolver
extends AbstractNamedValueMethodArgumentResolver
```
Resolver for @Header arguments. Headers are resolved from either the top-level header map or the nested native header map.
Since:
5.2
Author:
Rossen Stoyanchev
See Also:
HeadersMethodArgumentResolver, NativeMessageHeaderAccessor

Nested Class Summary
- Nested classes/interfaces inherited from class org.springframework.messaging.handler.annotation.reactive.AbstractNamedValueMethodArgumentResolver
  AbstractNamedValueMethodArgumentResolver.NamedValueInfo

Constructor Summary
Constructors
Constructor Description
HeaderMethodArgumentResolver(ConversionService conversionService, ConfigurableBeanFactory beanFactory)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected AbstractNamedValueMethodArgumentResolver.NamedValueInfo`	`createNamedValueInfo(MethodParameter parameter)`	Create the `AbstractNamedValueMethodArgumentResolver.NamedValueInfo` object for the given method parameter.
`protected void`	`handleMissingValue(String headerName, MethodParameter parameter, Message<?> message)`	Invoked when a value is required, but `AbstractNamedValueMethodArgumentResolver.resolveArgumentInternal(org.springframework.core.MethodParameter, org.springframework.messaging.Message<?>, java.lang.String)` returned `null` and there is no default value.
`protected Object`	`resolveArgumentInternal(MethodParameter parameter, Message<?> message, String name)`	Resolves the given parameter type and value name into an argument value.
`boolean`	`supportsParameter(MethodParameter parameter)`	Whether the given method parameter is supported by this resolver.

Methods inherited from class org.springframework.messaging.handler.annotation.reactive.AbstractNamedValueMethodArgumentResolver
resolveArgumentValue

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

Methods inherited from interface org.springframework.messaging.handler.invocation.reactive.SyncHandlerMethodArgumentResolver
resolveArgument

- Constructor Detail
  - HeaderMethodArgumentResolver
```
public HeaderMethodArgumentResolver(ConversionService conversionService,
                                    @Nullable
                                    ConfigurableBeanFactory beanFactory)
```
- Method Detail
  - supportsParameter
```
public boolean supportsParameter(MethodParameter parameter)
```
    Description copied from interface: HandlerMethodArgumentResolver
    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
  - createNamedValueInfo
```
protected AbstractNamedValueMethodArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)
```
    Description copied from class: AbstractNamedValueMethodArgumentResolver
    Create the AbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).
    Specified by:
    createNamedValueInfo in class AbstractNamedValueMethodArgumentResolver
    Parameters:
    parameter - the method parameter
    Returns:
    the named value information
  - resolveArgumentInternal
```
@Nullable
protected Object resolveArgumentInternal(MethodParameter parameter,
                                         Message<?> message,
                                         String name)
```
    Description copied from class: AbstractNamedValueMethodArgumentResolver
    Resolves the given parameter type and value name into an argument value.
    Specified by:
    resolveArgumentInternal in class AbstractNamedValueMethodArgumentResolver
    Parameters:
    parameter - the method parameter to resolve to an argument value
    message - the current request
    name - the name of the value being resolved
    Returns:
    the resolved argument. May be null
  - handleMissingValue
```
protected void handleMissingValue(String headerName,
                                  MethodParameter parameter,
                                  Message<?> message)
```
    Description copied from class: AbstractNamedValueMethodArgumentResolver
    Invoked when a value is required, but AbstractNamedValueMethodArgumentResolver.resolveArgumentInternal(org.springframework.core.MethodParameter, org.springframework.messaging.Message<?>, java.lang.String) returned null and there is no default value. Sub-classes can throw an appropriate exception for this case.
    Specified by:
    handleMissingValue in class AbstractNamedValueMethodArgumentResolver
    Parameters:
    headerName - the name for the value
    parameter - the target method parameter
    message - the message being processed

Class HeaderMethodArgumentResolver

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.messaging.handler.annotation.reactive.AbstractNamedValueMethodArgumentResolver

Constructor Summary

Method Summary

Methods inherited from class org.springframework.messaging.handler.annotation.reactive.AbstractNamedValueMethodArgumentResolver

Methods inherited from class java.lang.Object

Methods inherited from interface org.springframework.messaging.handler.invocation.reactive.SyncHandlerMethodArgumentResolver

Constructor Detail

HeaderMethodArgumentResolver

Method Detail

supportsParameter

createNamedValueInfo

resolveArgumentInternal

handleMissingValue