Package org.springframework.graphql.data.method

Interface HandlerMethodArgumentResolver

All Known Implementing Classes:

ArgumentMapMethodArgumentResolver, ArgumentMethodArgumentResolver, ArgumentsMethodArgumentResolver, AuthenticationPrincipalArgumentResolver, ContextValueMethodArgumentResolver, ContinuationHandlerMethodArgumentResolver, DataFetchingEnvironmentMethodArgumentResolver, DataLoaderMethodArgumentResolver, HandlerMethodArgumentResolverComposite, LocalContextValueMethodArgumentResolver, PrincipalMethodArgumentResolver, ProjectedPayloadMethodArgumentResolver, SourceMethodArgumentResolver

public interface HandlerMethodArgumentResolver

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

Most implementations will be synchronous, simply resolving values from the DataFetchingEnvironment. However, a resolver may also return a Mono if it needs to be asynchronous.

Since:

1.0.0

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method	Description
Object	resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment)	Resolve a method parameter to a value.
boolean	supportsParameter(MethodParameter parameter)	Whether this resolver supports the given MethodParameter.

Method Details

supportsParameter

boolean supportsParameter(MethodParameter parameter)

Whether this resolver supports the given MethodParameter.

resolveArgument

@Nullable
Object resolveArgument(MethodParameter parameter,
 DataFetchingEnvironment environment)
                throws Exception

Resolve a method parameter to a value.

Parameters:

parameter - the method parameter to resolve. This parameter must have previously checked via supportsParameter(org.springframework.core.MethodParameter).

environment - the environment to use to resolve the value

Returns:

the resolved value, which may be null if not resolved; the value may also be a Mono if it requires asynchronous resolution.

Throws:

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