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https://issues.apache.org/jira/browse/LUCENE-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-6473:
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Attachment: LUCENE-6473.patch
Patch. This makes Spans an interface, incorporating the DocIdSetIterator
methods that are used in the various implementations. It also adds a
Spans.Iterator wrapper class that represents a Spans as a DocIdSetIterator for
those places that need it.
Another way to do this would be perhaps to make DocIdSetIterator itself an
interface. It currently only has a single concrete method on it,
slowAdvance(), which we could replace in trunk with a default interface method
and in 5.x with a separate utility method. I'd guess that a lot more people
extend DISI in their own code, however, which would make that change more
invasive.
> Make Spans an interface
> -----------------------
>
> Key: LUCENE-6473
> URL: https://issues.apache.org/jira/browse/LUCENE-6473
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Attachments: LUCENE-6473.patch
>
>
> Spans is currently an abstract class, extending DocIdSetIterator. This
> restricts what we can do with implementations of Spans. For example, in
> LUCENE-6371, it would be useful to have PayloadSpan classes that extend
> existing Spans implementations, but that also implement a PayloadSpans
> interface that extends Spans. This isn't possible if Spans is not an
> interface itself.
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