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https://issues.apache.org/jira/browse/SOLR-8673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226628#comment-17226628
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Tim Owen commented on SOLR-8673:
--------------------------------
I've attached a patch that I used and it allowed me to port our custom
aggregate functions into our plugin jar instead of being in solr. I added
getters only for FacetContext, as I couldn't see any need for setters there
(and it's a conservative change).
Also I made some changes in SlotAcc because many of the useful base classes
e.g. DoubleFuncSlotAcc were package-private too, and we were using those as the
superclass for our accumulators. So mostly I've made those inner classes
public, and their fields protected, and fixed up some whitespace indentation
issues. Also IntSlotAcc wasn't a static inner class, which I think was just an
oversight from before.
Do you think these are OK to expose now? Could these changes also be put into
8.x?
> o.a.s.search.facet classes not public/extendable
> ------------------------------------------------
>
> Key: SOLR-8673
> URL: https://issues.apache.org/jira/browse/SOLR-8673
> Project: Solr
> Issue Type: Improvement
> Components: Facet Module
> Affects Versions: 5.4.1
> Reporter: Markus Jelsma
> Priority: Major
> Fix For: 6.2, 7.0
>
> Attachments: SOLR-8673.patch
>
>
> It is not easy to create a custom JSON facet function. A simple function
> based on AvgAgg quickly results in the following compilation failures:
> {code}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile)
> on project openindex-solr: Compilation failure: Compilation failure:
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[22,36]
> org.apache.solr.search.facet.FacetContext is not public in
> org.apache.solr.search.facet; cannot be accessed from outside package
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[23,36]
> org.apache.solr.search.facet.FacetDoubleMerger is not public in
> org.apache.solr.search.facet; cannot be accessed from outside package
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[40,32]
> cannot find symbol
> [ERROR] symbol: class FacetContext
> [ERROR] location: class i.o.s.search.facet.CustomAvgAgg
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[49,39]
> cannot find symbol
> [ERROR] symbol: class FacetDoubleMerger
> [ERROR] location: class i.o.s.search.facet.CustomAvgAgg
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[54,43]
> cannot find symbol
> [ERROR] symbol: class Context
> [ERROR] location: class i.o.s.search.facet.CustomAvgAgg.Merger
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[41,16]
> cannot find symbol
> [ERROR] symbol: class AvgSlotAcc
> [ERROR] location: class i.o.s.search.facet.CustomAvgAgg
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[46,12]
> incompatible types: i.o.s.search.facet.CustomAvgAgg.Merger cannot be
> converted to org.apache.solr.search.facet.FacetMerger
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[53,5]
> method does not override or implement a method from a supertype
> [ERROR]
> /home/markus/projects/openindex/solr/trunk/src/main/java/i.o.s.search/facet/CustomAvgAgg.java:[60,5]
> method does not override or implement a method from a supertype
> {code}
> It seems lots of classes are tucked away in FacetModule, which we can't reach
> from outside.
> Originates from this thread:
> http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201602.mbox/%3ccab_8yd9ldbg_0zxm_h1igkfm6bqeypd5ilyy7tty8cztscv...@mail.gmail.com%3E
> ( also available at
> https://lists.apache.org/thread.html/9fddcad3136ec908ce1c57881f8d3069e5d153f08b71f80f3e18d995%401455019826%40%3Csolr-user.lucene.apache.org%3E
> )
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