[jira] [Resolved] (GROOVY-8271) Take/TakeRight methods on iterator needlessly calls hasNext for one too many elements

["Paul King (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-8271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King resolved GROOVY-8271.
-------------------------------
       Resolution: Fixed
         Assignee: Paul King
    Fix Version/s: 2.4.13

Fix applied - thanks!

> Take/TakeRight methods on iterator needlessly calls hasNext for one too many elements
> -------------------------------------------------------------------------------------
>
>                 Key: GROOVY-8271
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8271
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-jdk
>    Affects Versions: 2.4.12
>            Reporter: Marty Neal
>            Assignee: Paul King
>            Priority: Minor
>             Fix For: 2.4.13
>
>
> I expect the {{TakeIterator}} to only call the {{hasNext()}} method for the delegate a maximum of {{N}} times where {{N}} is the number of elements to take.  If the iterator represents some expensive operations, or an unexhausted infinite stream that has exactly {{N}} elements available, the {{TakeIterator}} will block waiting for the {{Nth+1}} element only to return {{N}} of them.
> In short, change the {{TakeIterator}}'s {{hasNext}} function from
>             {{return delegate.hasNext() && num > 0;}}
> to
>             {{return num > 0 && delegate.hasNext();}}



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