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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-8903) Move SolrJ DateUtil to Extraction module as ExtractionDateUtil
Date Fri, 25 Mar 2016 02:39:25 GMT
David Smiley created SOLR-8903:
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             Summary: Move SolrJ DateUtil to Extraction module as ExtractionDateUtil
                 Key: SOLR-8903
                 URL: https://issues.apache.org/jira/browse/SOLR-8903
             Project: Solr
          Issue Type: Task
          Components: SolrJ
            Reporter: David Smiley
            Assignee: David Smiley


SolrJ doesn't need a DateUtil class, particularly since we're on Java 8 and can simply use
{{new Date(Instant.parse(d).toEpochMilli());}} for parsing and {{DateTimeFormatter.ISO_INSTANT.format(d.toInstant())}}
for formatting.  Yes, they are threadsafe.  I propose that we deprecate DateUtil from SolrJ,
or perhaps outright remove it from SolrJ for Solr 6.  The only SolrJ calls into this class
are to essentially use it to format or parse in the ISO standard format.

I also think we should move it to the "extraction" (SolrCell) module and name it something
like ExtractionDateUtil.  See, this class has a parse method taking a list of formats, and
there's a static list of them taken from HttpClient's DateUtil.  DateUtil's original commit
was SOLR-284 to be used by SolrCell, and SolrCell wants this feature.  So I think it should
move there.

There are a couple other uses:
* Morphlines uses it, but morphlines depends on the extraction module so it could just as
well access it if we move it there.
* The ValueAugmenterFactory (a doc transformer).  I really doubt whoever added it realized
that DateUtil.parseDate would try a bunch of formats instead of only supporting the ISO canonical
format.  So I think we should just remove this reference.



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