[jira] [Resolved] (LUCENE-7277) Make Query.hashCode and Query.equals abstract

["Dawid Weiss (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dawid Weiss resolved LUCENE-7277.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 6.x

Pushed to master and branch_6x. Thanks for helping out, Paul!

> 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
>             Fix For: 6.x, master (7.0)
>
>         Attachments: LUCENE-7277-20160518.patch, LUCENE-7277.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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