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https://issues.apache.org/jira/browse/TINKERPOP-800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yang Xia closed TINKERPOP-800.
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Resolution: Won't Do
Closing given
[discussion|https://lists.apache.org/thread/om2m0phg25s83529p9w0gldmcxz7578h] -
it can be reopened if there is expectation that there will be active work on
this item.
> Domain/Range checking during traversal construction.
> ----------------------------------------------------
>
> Key: TINKERPOP-800
> URL: https://issues.apache.org/jira/browse/TINKERPOP-800
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.0.2-incubating
> Reporter: Marko A. Rodriguez
> Priority: Major
> Labels: breaking
>
> I think we should add two new methods to {{Step}}.
> {code}
> Step.getDomain() -> Class
> Step.getRange() -> Class
> {code}
> Now, when someone does:
> {code}
> g.V().out()
> {code}
> {{GraphStep}} will report that its range is {{Vertex.class}}. {{VertexStep}}
> will report its domain to be {{Vertex.class}}. Good. No typing issues.
> However, when you do this:
> {code}
> g.E().out()
> {code}
> {{GraphStep}} will report that its range is {{Edge.class}}. {{VertexStep}}
> will report its domain to be {{Vertex.class}} --- {{IllegalArgumentException:
> "The provided traversal has an illegal function composition."}}.
> Why is this good -- much better than getting random {{ClassCastExceptions}}
> at execution time.
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