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https://issues.apache.org/jira/browse/LUCENE-1701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721830#action_12721830
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Earwin Burrfoot commented on LUCENE-1701:
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Mike, I very much agree with everything you said, except "factory is less
consumable than constructor" and "add stuff to index to handle NumericField".
Out of your three examples the second one is bad, no questions. But first and
last are absolutely equal in terms of consumability.
Static factories are cool (they allow to switch implementations and
instantiation logic without changing API) and are as easy to use (probably even
easier with generics in Java5) as constructors.
If we add some generic storable flags for Lucene fields, this is cool
(probably), NumericField can then capitalize on it, as well as users writing
their own NNNFields.
Tying index format to some particular implementation of numerics is bad design.
Why on earth can't my own split-field (vs single-field as in current Lucene)
trie-encoded number enjoy the same benefits as NumericField from Lucene core?
bq. By this same logic, should we remove NumericRangeFilter/Query and use
static factories instead?
I do use factory methods for all my queries and filters, and it makes me feel
warm and fuzzy! :) Under the hood some of them consult FieldInfo to instantiate
custom-tailored query variants, so I just use range(CREATION_TIME, from, to)
and don't think if this field is trie-encoded or raw.
"Simple things should be simple", okay. Complex things should be simple too,
argh! :)
> Add NumericField and NumericSortField, make plain text numeric parsers public
> in FieldCache, move trie parsers to FieldCache
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1701
> URL: https://issues.apache.org/jira/browse/LUCENE-1701
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index, Search
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 2.9
>
>
> In discussions about LUCENE-1673, Mike & me wanted to add a new NumericField
> to o.a.l.document specific for easy indexing. An alternative would be to add
> a NumericUtils.newXxxField() factory, that creates a preconfigured Field
> instance with norms and tf off, optionally a stored text (LUCENE-1699) and
> the TokenStream already initialized. On the other hand
> NumericUtils.newXxxSortField could be moved to NumericSortField.
> I and Yonik tend to use the factory for both, Mike tends to create the new
> classes.
> Also the parsers for string-formatted numerics are not public in FieldCache.
> As the new SortField API (LUCENE-1478) makes it possible to support a parser
> in SortField instantiation, it would be good to have the static parsers in
> FieldCache public available. SortField would init its member variable to them
> (instead of NULL), so making code a lot easier (FieldComparator has this ugly
> null checks when retrieving values from the cache).
> Moving the Trie parsers also as static instances into FieldCache would make
> the code cleaner and we would be able to hide the "hack"
> StopFillCacheException by making it private to FieldCache (currently its
> public because NumericUtils is in o.a.l.util).
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