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Re: attribute order (RE: Syntax Sugar and XML informationmodels)

• From: Justin Couch <justin@v...>
• To: "Simon St.Laurent" <simonstl@s...>
• Date: Sat, 31 Mar 2001 00:16:52 +1000

"Simon St.Laurent" wrote:
 
> It is possible, but is it optimal?  I suspect the HashMap takes more
> overhead than the array, though I could be wrong about that.

[Waving hands randomly] 

Depends on your hashing implementation and then the bucket handling (ie
making sure the map is big enough in the first place to support all the
attributes without having to re-hash). As most parsers are likely to use
the standard java.util.HashMap, then probably not as it's impl isn't the
worlds best. 

If the code just used an array list, I'm not sure that it would be any
better than a HashMap either. *If* the hashmap used just string
name/value pairs there is less object allocation overhead than having to
create an Attribute object representation for each item. Object
allocation is expensive compared to inserts and possible rehash of the
map. From the SAX perspective, it really depends on whether the
Attributes class implements the holders of information as separate
arrays for each item to be kept (type, name, value etc) or uses a
lighweight container class.

-- 
Justin Couch                         http://www.vlc.com.au/~justin/
Freelance Java Consultant                  http://www.yumetech.com/
Author, Java 3D FAQ Maintainer                  http://www.j3d.org/
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• Follow-Ups:
  • Re: attribute order (RE: Syntax Sugar and XML informationmodels)
    • From: "Martin v. Loewis" <martin@l...>

• References:
  • Re: attribute order (RE: Syntax Sugar and XML information models)
    • From: Rick Jelliffe <ricko@a...>
  • RE: attribute order (RE: Syntax Sugar and XML information models)
    • From: "Simon St.Laurent" <simonstl@s...>
  • Re: attribute order (RE: Syntax Sugar and XML information models)
    • From: "Simon St.Laurent" <simonstl@s...>

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