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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1653) Change DateTools to not create a Calendar in every call to dateToString or timeToString
Date Tue, 30 Jun 2009 02:59:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725447#action_12725447
] 

David Smiley commented on LUCENE-1653:
--------------------------------------

I'm looking through DateTools now and can't help but want to clean it up some.  One thing
I see that is odd is the use of a Calendar in timeToString(long,resolution).  The first two
lines look like this right now:
{code}
calInstance.setTimeInMillis(round(time, resolution));
Date date = calInstance.getTime();
{code}

Instead, it can simply be:
{code}
Date date = new Date(round(time, resolution));
{code}.

Secondly... I think a good deal of logic can be cleaned up in the other methods instead of
a bunch of if-else statements that is a bad code smell.  Most of the logic of 3 of those methods
could be put into Resolution and be made tighter.

> Change DateTools to not create a Calendar in every call to dateToString or timeToString
> ---------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1653
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1653
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Other
>            Reporter: Shai Erera
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1653.patch, LUCENE-1653.patch
>
>
> DateTools creates a Calendar instance on every call to dateToString and timeToString.
Specifically:
> # timeToString calls Calendar.getInstance on every call.
> # dateToString calls timeToString(date.getTime()), which then instantiates a new Date().
I think we should change the order of the calls, or not have each call the other.
> # round(), which is called from timeToString (after creating a Calendar instance) creates
another (!) Calendar instance ...
> Seems that if we synchronize the methods and create the Calendar instance once (static),
it should solve it.

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