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https://issues.apache.org/jira/browse/LUCENE-2310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13010032#comment-13010032
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Chris Male commented on LUCENE-2310:
------------------------------------

Yes Field would still compile if you removed the extends.  However if we empty 
AbstractField then any client code that also extends AbstractField would break. 
 Thats why I deprecate the whole class but leave its code in.  We could empty 
it and change it to extend Field, I think that would still work.

> Reduce Fieldable, AbstractField and Field complexity
> ----------------------------------------------------
>
>                 Key: LUCENE-2310
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2310
>             Project: Lucene - Java
>          Issue Type: Sub-task
>          Components: Index
>            Reporter: Chris Male
>         Attachments: LUCENE-2310-Deprecate-AbstractField-CleanField.patch, 
> LUCENE-2310-Deprecate-AbstractField.patch, 
> LUCENE-2310-Deprecate-AbstractField.patch, 
> LUCENE-2310-Deprecate-AbstractField.patch, 
> LUCENE-2310-Deprecate-DocumentGetFields-core.patch, 
> LUCENE-2310-Deprecate-DocumentGetFields.patch, 
> LUCENE-2310-Deprecate-DocumentGetFields.patch, LUCENE-2310.patch
>
>
> In order to move field type like functionality into its own class, we really 
> need to try to tackle the hierarchy of Fieldable, AbstractField and Field.  
> Currently AbstractField depends on Field, and does not provide much more 
> functionality that storing fields, most of which are being moved over to 
> FieldType.  Therefore it seems ideal to try to deprecate AbstractField (and 
> possible Fieldable), moving much of the functionality into Field and 
> FieldType.

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