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https://issues.apache.org/jira/browse/LUCENE-7277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Elschot updated LUCENE-7277:
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Attachment: LUCENE-7277-20160518.patch
Patch of 18 May 2016.
This is for lucene core and for the other lucene modules, solr fails to compile.
I added Objects.requireNonNull in a few constructors to simplify the
hashCode/equals implementations.
In the suggest module the queries throw UOE in hashCode/equals, that is
probably correct, but I'm not sure.
> Make Query.hashCode and Query.equals abstract
> ---------------------------------------------
>
> Key: LUCENE-7277
> URL: https://issues.apache.org/jira/browse/LUCENE-7277
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Trivial
> Attachments: LUCENE-7277-20160518.patch, LUCENE-7277.patch
>
>
> Custom subclasses of the Query class have the default implementation of
> hashCode/equals that make all instances of the subclass equal. If somebody
> doesn't know this it can be pretty tricky to debug with IndexSearcher's query
> cache on.
> Is there any rationale for declaring it this way instead of making those
> methods abstract (and enforcing their proper implementation in a subclass)?
> {code}
> public int hashCode() {
> return getClass().hashCode();
> }
> public boolean equals(Object obj) {
> if (obj == null)
> return false;
> return getClass() == obj.getClass();
> }
> {code}
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