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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3312) Break out StorableField from IndexableField
Date Wed, 11 Jul 2012 09:48:35 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411355#comment-13411355
] 

Uwe Schindler commented on LUCENE-3312:
---------------------------------------

Nikola: Did you get the test running now? Otherwise I see no problems with the code at the
moment, but I will wait for other comment contributions!

I still have a question to the iterator again:

{code:java}
public abstract class FilterIterator<T, U extends T> implements Iterator<T> {
{code}

This seems strange U extends T, so the iterator returns a wider type than it was in the original.
I would expect it to be the other way round. In general for this FilteredIterator I would
make no generics magic and let it return the same as the delegate. If the predicate changes
type, then this should be done by the caller (who provides the predicate). Do I miss something?
                
> Break out StorableField from IndexableField
> -------------------------------------------
>
>                 Key: LUCENE-3312
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3312
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Michael McCandless
>            Assignee: Nikola Tankovic
>              Labels: gsoc2012, lucene-gsoc-12
>             Fix For: Field Type branch
>
>         Attachments: lucene-3312-patch-01.patch, lucene-3312-patch-02.patch, lucene-3312-patch-03.patch,
lucene-3312-patch-04.patch, lucene-3312-patch-05.patch, lucene-3312-patch-06.patch, lucene-3312-patch-07.patch
>
>
> In the field type branch we have strongly decoupled
> Document/Field/FieldType impl from the indexer, by having only a
> narrow API (IndexableField) passed to IndexWriter.  This frees apps up
> use their own "documents" instead of the "user-space" impls we provide
> in oal.document.
> Similarly, with LUCENE-3309, we've done the same thing on the
> doc/field retrieval side (from IndexReader), with the
> StoredFieldsVisitor.
> But, maybe we should break out StorableField from IndexableField,
> such that when you index a doc you provide two Iterables -- one for the
> IndexableFields and one for the StorableFields.  Either can be null.
> One downside is possible perf hit for fields that are both indexed &
> stored (ie, we visit them twice, lookup their name in a hash twice,
> etc.).  But the upside is a cleaner separation of concerns in API....

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