org.springframework.graphql.data.method

Interface HandlerMethodArgumentResolver

All Known Implementing Classes:

ArgumentMapMethodArgumentResolver, ArgumentMethodArgumentResolver, DataFetchingEnvironmentMethodArgumentResolver, HandlerMethodArgumentResolverComposite, SourceMethodArgumentResolver

public interface HandlerMethodArgumentResolver

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

Since:

1.0.0

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method and Description
Object	resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment) Resolves a method parameter into an argument value from a given request.
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,
                                 DataFetchingEnvironment environment)
                          throws Exception

Resolves a method parameter into an argument value from a given request. A ModelAndViewContainer provides access to the model for the request. A WebDataBinderFactory provides a way to create a WebDataBinder instance when needed for data binding and type conversion purposes.

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.

environment - the GraphQL DataFetchingEnvironment

Returns:

the resolved argument value, or null if not resolvable

Throws:

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