[jira] [Assigned] (TINKERPOP-819) Mapping Cardinality Interface

["Stephen Mallette (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TINKERPOP-819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen Mallette reassigned TINKERPOP-819:
------------------------------------------

    Assignee: Stephen Mallette  (was: Marko A. Rodriguez)

> Mapping Cardinality Interface
> -----------------------------
>
>                 Key: TINKERPOP-819
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-819
>             Project: TinkerPop
>          Issue Type: Improvement
>          Components: process
>    Affects Versions: 3.0.2-incubating
>            Reporter: Marko A. Rodriguez
>            Assignee: Stephen Mallette
>            Priority: Minor
>              Labels: breaking
>
> I think it would be handy (for some {{sack()}} work I'm doing on merging/splitting sacks), but also in general as I've wanted this before (can't remember why). I think we should add the following interfaces.
> {code}
> ManyToOneMapping (e.g. reducing barriers)
> OneToManyMapping (e.g. flatmap)
> OneToOneMapping (e.g. map, sideeffects)
> OneToOneOrNoneMapping (e.g. filter)
> {code}
> We can just rely on {{instanceof FlatMapStep}} or {{instanceof MapStep}} as there are steps that are "map steps" but don't extend {{MapStep}}, but instead {{AbstractStep}}. Either we make it so that all steps MUST extend from {{FlatMapStep}}, {{MapStep}}, etc. or we can add the above interfaces.



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