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https://issues.apache.org/jira/browse/LUCENE-2109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786145#action_12786145
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Paul Elschot commented on LUCENE-2109:
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Vielen Dank für diese Gründlichkeit.
> Make DocsEnum subclass of DocIdSetIterator
> ------------------------------------------
>
> Key: LUCENE-2109
> URL: https://issues.apache.org/jira/browse/LUCENE-2109
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: Flex Branch
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: Flex Branch
>
> Attachments: LUCENE-2109.patch, LUCENE-2109.patch, LUCENE-2109.patch,
> LUCENE-2109.patch
>
>
> Spinoff from LUCENE-1458:
> One thing I came along long time ago, but now with a new API it get's
> interesting again:
> DocsEnum should extend DocIdSetIterator, that would make it simplier to use
> and implement e.g. in MatchAllDocQuery.Scorer, FieldCacheRangeFilter and so
> on. You could e.g. write a filter for all documents that simply returns the
> docs enumeration from IndexReader.
> So it should be an abstract class that extends DocIdSetIterator. It has the
> same methods, only some methods must be a little bit renamed. The problem is,
> because java does not support multiple inheritace, we cannot also extends
> attributesource Would DocIdSetIterator be an interface it would work (this
> is one of the cases where interfaces for really simple patterns can be used,
> like iterators).
> The problem with multiple inheritance could be solved by an additional method
> attributes() that creates a new AttributeSource on first access then (because
> constructing an AttributeSource is costly). The same applies for the other
> *Enums, it should be separated for lazy init.
> DocsEnum could look like this:
> {code}
> public abstract class DocsEnum extends DocIdSetIterator {
> private AttributeSource atts = null;
> public int freq()
> public DontKnowClassName positions()
> public final AttributeSource attributes() {
> if (atts==null) atts=new AttributeSource();
> return atts;
> }
> ...default impl of the bulk access using the abstract methods from
> DocIdSetIterator
> }
> {code}
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