Map as a return value? 2004-01-27 - By Joe Sam Shirah
Back
Hi Erik,
> >Collections.unmodifiableMap() wrapper.
This is a good, and probably the best, solution for Collections.
For other types and non-RMI situations mentioned by Damon,
copying/cloning may be the best option. There's a good article
by Peter Haggar about the topic at
<http://www.informit.com/content/index.asp?product_id=%7B0ED371D2-F3BD-4CF7-
86C2-CE7CE078D5D7%7D>
While performance is a concern,
Delay is preferable to error. - Thomas Jefferson
Joe Sam
Joe Sam Shirah - http://www.conceptgo.com
conceptGO - Consulting/Development/Outsourcing
Java Filter Forum: http://www.ibm.com/developerworks/java/
Just the JDBC FAQs: http://www.jguru.com/faq/JDBC
Going International? http://www.jguru.com/faq/I18N
Que Java400? http://www.jguru.com/faq/Java400
-- -- Original Message -- --
From: "Erik Beijnoff" <erik@(protected)>
To: <J2EE-INTEREST@(protected)>
Sent: Tuesday, January 27, 2004 7:26 AM
Subject: Re: Map as a return value?
> >2) Rather than copy it, if it's not going to change, return it wrapped
> in a
> >Collections.unmodifiableMap() wrapper. Then its safe and efficient for
> local or remote use.
>
> *Exactly* what I am looking for. Strange that I haven't encountered that
> little feature before. I've wondered why the HttpServletRequest can
> return an immutable Map. Eh. Well, it's a big API, and I assume you
> learn something new everyday, even if it's propably something rather
> basic that I should've known by now.
>
> Thanks also for the rest of your comments. Very informative.
>
> Regards Erik Beijnoff
>
===========================================================================
To unsubscribe, send email to listserv@(protected) and include in the body
of the message "signoff J2EE-INTEREST". For general help, send email to
listserv@(protected) and include in the body of the message "help".
|
|
