Class HandlerMethodArgumentResolverComposite

java.lang.Object

org.springframework.graphql.data.method.HandlerMethodArgumentResolverComposite

All Implemented Interfaces:

HandlerMethodArgumentResolver

public class HandlerMethodArgumentResolverComposite
extends Object
implements HandlerMethodArgumentResolver

Container for a list of resolvers that looks for one that supports a given method parameter type, and delegates to it.

Since:

1.0.0

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
HandlerMethodArgumentResolverComposite()

Method Summary

Modifier and Type	Method	Description
void	addResolver(HandlerMethodArgumentResolver resolver)	Add the given HandlerMethodArgumentResolver.
@Nullable HandlerMethodArgumentResolver	getArgumentResolver(MethodParameter parameter)	Find a registered HandlerMethodArgumentResolver that supports the given method parameter.
List<HandlerMethodArgumentResolver>	getResolvers()	Return a read-only list with the contained resolvers, or an empty list.
@Nullable Object	resolveArgument(MethodParameter parameter, graphql.schema.DataFetchingEnvironment environment)	Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.
boolean	supportsParameter(MethodParameter parameter)	Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HandlerMethodArgumentResolverComposite

public HandlerMethodArgumentResolverComposite()

Method Details

addResolver

public void addResolver(HandlerMethodArgumentResolver resolver)

Add the given HandlerMethodArgumentResolver.

Parameters:

resolver - the argument resolver

getResolvers

public List<HandlerMethodArgumentResolver> getResolvers()

Return a read-only list with the contained resolvers, or an empty list.

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

Specified by:

supportsParameter in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to check for support

resolveArgument

public @Nullable Object resolveArgument(MethodParameter parameter,
 graphql.schema.DataFetchingEnvironment environment)
                                 throws Exception

Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.

Specified by:

resolveArgument in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to resolve. This parameter must have previously checked via HandlerMethodArgumentResolver.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:

IllegalArgumentException - if no suitable argument resolver is found

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

getArgumentResolver

public @Nullable HandlerMethodArgumentResolver getArgumentResolver(MethodParameter parameter)

Find a registered HandlerMethodArgumentResolver that supports the given method parameter.

Parameters:

parameter - the method parameter