Package org.springframework.graphql.data.method.annotation.support

Class SubrangeMethodArgumentResolver<P>

java.lang.Object

org.springframework.graphql.data.method.annotation.support.SubrangeMethodArgumentResolver<P>

Type Parameters:

P - the type of position in the subrange

All Implemented Interfaces:

HandlerMethodArgumentResolver

Direct Known Subclasses:

ScrollSubrangeMethodArgumentResolver

public class SubrangeMethodArgumentResolver<P>
extends Object
implements HandlerMethodArgumentResolver

Resolver for a method argument of type Subrange initialized from "first", "last", "before", and "after" GraphQL arguments.

Since:

1.2.0

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
SubrangeMethodArgumentResolver(CursorStrategy<P> cursorStrategy)

Method Summary

Modifier and Type	Method	Description
protected Subrange<P>	createSubrange(P pos, Integer count, boolean forward)	Allows subclasses to create an extension of Subrange.
Object	resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment)	Resolve a method parameter to a value.
boolean	supportsParameter(MethodParameter parameter)	Whether this resolver supports the given MethodParameter.

Methods inherited from class java.lang.Object

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

Constructor Details

SubrangeMethodArgumentResolver

public SubrangeMethodArgumentResolver(CursorStrategy<P> cursorStrategy)

Method Details

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Description copied from interface: HandlerMethodArgumentResolver

Whether this resolver supports the given MethodParameter.

Specified by:

supportsParameter in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to check for support

resolveArgument

public Object resolveArgument(MethodParameter parameter,
 DataFetchingEnvironment environment)
                       throws Exception

Description copied from interface: HandlerMethodArgumentResolver

Resolve a method parameter to a value.

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:

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

createSubrange

protected Subrange<P> createSubrange(@Nullable
 P pos,
 @Nullable
 Integer count,
 boolean forward)

Allows subclasses to create an extension of Subrange.

Parameters:

pos - the position in the subrange

count - the number of elements in the subrange

forward - whether the scroll direction is forward or backward from this position