RFR: 1256: Provide a common method to get the corresponding csr issue

[Guoxiong Li]

On Tue, 30 Nov 2021 13:26:12 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> Hi all,
> 
> This patch adds the common methods `Issue#linksWithRelationships`, `Issue#csrLink` and `Issue#csrIssue` and refactors the code to reduce the loop nested statements by using these common methods.
> 
> All the existing tests passed.
> 
> Best Regards,
> -- Guoxiong

> I'm not sure there will ever be a need to filter links with multiple different relationships. Do you know of any such case that you are planning to convert?

It can be used in the method `Backports#findMainIssue`:


// method Backports#findMainIssue
var links = issue.linksWithRelationships(List.of("backported by", "backport of"));


But If we use the stream api, it is not need now.

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PR: https://git.openjdk.java.net/skara/pull/1248