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https://issues.apache.org/jira/browse/GROOVY-8271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-8271.
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> 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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