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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2647) Replace String comparison if-then-else with switch
Date Tue, 08 Apr 2014 18:21:22 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963270#comment-13963270
] 

Christopher Tubbs commented on ACCUMULO-2647:
---------------------------------------------

In the code for ACCUMULO-1496, I've used annotations and searched for annotated classes. That
was slow, due to the indexing of the annotations. For this ticket, we could adopt a hybrid
approach, looping over a set of known classes, reading the annotations, rather than doing
all the if statements. (It would also simplify the merge if we revisit ACCUMULO-1496.)

> Replace String comparison if-then-else with switch
> --------------------------------------------------
>
>                 Key: ACCUMULO-2647
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2647
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: start
>    Affects Versions: 1.6.0
>            Reporter: Mike Drob
>              Labels: newbie
>             Fix For: 1.7.0
>
>
> In o.a.a.start.Main we have a giant if-then-else ladder for determining which class to
use. With Java 7, we can replace this with a switch statement.
> bq. The switch statement compares the String object in its expression with the expressions
associated with each case label as if it were using the String.equals method; consequently,
the comparison of String objects in switch statements is case sensitive. The Java compiler
generates generally more efficient bytecode from switch statements that use String objects
than from chained if-then-else statements.



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