From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Chris McMahan Newsgroups: gmane.emacs.help Subject: Re: indent-region for long Java strings very slow Date: Thu, 26 Oct 2006 13:43:16 -0400 Organization: PANIX Public Access Internet and UNIX, NYC Message-ID: References: <1161872117.135227.178220@i42g2000cwa.googlegroups.com> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1161888042 29847 80.91.229.2 (26 Oct 2006 18:40:42 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Thu, 26 Oct 2006 18:40:42 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Oct 26 20:40:41 2006 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1GdA9d-0000lr-QI for geh-help-gnu-emacs@m.gmane.org; Thu, 26 Oct 2006 20:40:38 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GdA9d-0007tc-CT for geh-help-gnu-emacs@m.gmane.org; Thu, 26 Oct 2006 14:40:37 -0400 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!postnews.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx01.iad01.newshosting.com!newshosting.com!198.186.194.247.MISMATCH!news-out.readnews.com!news-xxxfer.readnews.com!panix!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 40 Original-NNTP-Posting-Host: panix5.panix.com Original-X-Trace: reader2.panix.com 1161884593 21275 166.84.1.5 (26 Oct 2006 17:43:13 GMT) Original-X-Complaints-To: abuse@panix.com Original-NNTP-Posting-Date: Thu, 26 Oct 2006 17:43:13 +0000 (UTC) User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (windows-nt) Cancel-Lock: sha1:rjQwkg8yjyhJoa+53MEzO0lfMLA= Original-Xref: shelby.stanford.edu gnu.emacs.help:142685 Original-To: help-gnu-emacs@gnu.org X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:38306 Archived-At: I think the issue is not the running time of the program, but the time it takes emacs to parse the string sequence when indenting the java source code. In that case, it is an emacs issue. I would agree, however, with David's assessment that it's extremely inefficient to build a string with the series of concatenated strings, as Java does construct a separate string object for each concatenation. StringBuffer, as suggested, would be the way to go here. - Chris David Hansen writes: > On 26 Oct 2006 07:15:17 -0700 "giethomas@gmail.com" wrote: > >> When I build a very long Java String with lots of components (... + ... >> + ... +), spread out over many lines (each terminated by a newline), >> indent-region gets very, very slow. > > Not emacs related: AFAIK javac creates a new StringBuffer > object for *each* `+'. So if you don't want your program to > be unnecessarily slow do something like > > String foo = (new StringBuffer ()).append (...) > .append (...) > .append (...) > // ... > .toString (); > > David > > > -- (. .) =ooO=(_)=Ooo===================================== Chris McMahan | first_initiallastname@one.dot.net =================================================