xominterest AT lists.ibiblio.org
Subject: XOM API for Processing XML with Java
List archive
Re: [XOMinterest] Possible ArrayList optimization
 From: dirk bergstrom <dirk AT juniper.net>
 To: Elliotte Rusty Harold <elharo AT metalab.unc.edu>
 Cc: xominterest <xominterest AT lists.ibiblio.org>
 Subject: Re: [XOMinterest] Possible ArrayList optimization
 Date: Mon, 12 May 2003 19:52:24 0700
On 05/12/2003 07:14 PM, Elliotte Rusty Harold was heard to exclaim:
>>Is there any reason why an invocation of ArrayList.trimToSize (),
> I hadn't thought of that. How expensive is trimToSize()?
fairly cheap. about the same cost as extending the array. here's the source:
public void trimToSize() {
modCount++;
int oldCapacity = elementData.length;
if (size < oldCapacity) {
Object oldData[] = elementData;
elementData = new Object[size];
System.arraycopy(oldData, 0, elementData, 0, size);
}
}
> and you might be able to make that up by not having to
> constantly grow the arrays as you build the document. Just start them
> fairly large, and then chop it down when you're finished.
well, you probably don't want to start too big, since as you build a
document you'll have untrimmed ArrayLists for many of the nodes.

Dirk Bergstrom dirk AT juniper.net
_____________________________________________
Juniper Networks Inc., Computer Geek
Tel: 408.745.3182 Fax: 408.745.8905

Re: [XOMinterest] Possible ArrayList optimization
, (continued)

Re: [XOMinterest] Possible ArrayList optimization,
dirk bergstrom, 05/09/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/09/2003
 Re: [XOMinterest] Possible ArrayList optimization, Elliotte Rusty Harold, 05/11/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/09/2003

Re: [XOMinterest] Possible ArrayList optimization,
Bradley S. Huffman, 05/09/2003
 Re: [XOMinterest] Possible ArrayList optimization, Elliotte Rusty Harold, 05/10/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/11/2003

Re: [XOMinterest] Possible ArrayList optimization,
Bradley S. Huffman, 05/12/2003
 Re: [XOMinterest] Possible ArrayList optimization, Elliotte Rusty Harold, 05/12/2003

Re: [XOMinterest] Possible ArrayList optimization,
Bradley S. Huffman, 05/12/2003

Re: [XOMinterest] Possible ArrayList optimization,
Janek Bogucki, 05/11/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/12/2003

Re: [XOMinterest] Possible ArrayList optimization,
dirk bergstrom, 05/12/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/13/2003
 Re: [XOMinterest] Possible ArrayList optimization, Karl Waclawek, 05/13/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/13/2003

Re: [XOMinterest] Possible ArrayList optimization,
dirk bergstrom, 05/12/2003

Re: [XOMinterest] Possible ArrayList optimization,
Elliotte Rusty Harold, 05/12/2003
 RE: [XOMinterest] Possible ArrayList optimization, New, Cecil (GEAE), 05/13/2003

Re: [XOMinterest] Possible ArrayList optimization,
dirk bergstrom, 05/09/2003
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