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From "Uwe Schindler (JIRA)" <>
Subject [jira] Commented: (LUCENE-1935) Generify PriorityQueue
Date Thu, 01 Oct 2009 22:30:23 GMT


Uwe Schindler commented on LUCENE-1935:

Was it to avoid a perforance impact of casting or only for cleaner code? Because the generic
version of PQ does noch change anything, the resulting byte code is identical (you can compare
that with a decompilation using JAD). The casts are added by the Java Compiler automatically.
The lessThan method is covariant overloaded (passed through) by javac: lessThan(Integer, Integer)
will appear as such in the class byte code, but javac will add lessThan(Object, Object) that
delgates around (which may be a small perf impact), as it is called by the compiled code of
PQ (PQ does not know anything about generics in its byte code).

> Generify PriorityQueue
> ----------------------
>                 Key: LUCENE-1935
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: Other
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.0
>         Attachments: LUCENE-1935.patch
> Priority Queue should use generics like all other Java 5 Collection API classes. This
very simple, but makes code more readable.

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