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https://issues.apache.org/jira/browse/SLING-9550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17144811#comment-17144811
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Bertrand Delacretaz commented on SLING-9550:
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[https://github.com/graphql-java/graphql-java-extended-scalars/blob/master/src/main/java/graphql/scalars/object/ObjectScalar.java]
is a good example which also shows the {{graphql.language.*Value}} types that
need to be supported as literals.
> Support custom GraphQL Scalars
> ------------------------------
>
> Key: SLING-9550
> URL: https://issues.apache.org/jira/browse/SLING-9550
> Project: Sling
> Issue Type: Task
> Components: GraphQL
> Affects Versions: GraphQL Core 0.0.2
> Reporter: Bertrand Delacretaz
> Assignee: Bertrand Delacretaz
> Priority: Major
>
> We should support [custom
> scalars|https://www.graphql-java.com/documentation/v13/scalars/] in the
> GraphQL Core, which is a fancy way to say "custom data types".
> [https://github.com/graphql-java/graphql-java-extended-scalars] has examples
> of those.
> After a quick brainstorm with a colleague I think we need to following:
> * A way to provide "named type converters" that define the Scalar names and
> how to parse and serialize them.
> * A way to define "scalar namespaces" in the schemas, to avoid name
> collisions if multiple Scalars with the same name are used in different
> applications. That's probably a directive like the {{@fetcher}} that we
> already use, maybe something like
> {{@namespace(scalars='com.example.scalars')}}
> So far we've been able to avoid exposing the {{graphql-java}} APIs in the
> GraphQL Core APIs but I'm not sure if it makes sense here, will need to
> explore. If our APIs expose {{graphql-java}} APIs they should be under a
> {{sling.graphql.api.graphqljava}} package to make that clear.
> As an example use case we might add author name and email information to the
> sling-samples website example, using a custom scalar for the email.
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