[jdev] Re: Parsing XMPP/Jabber protocol

Trejkaz Xaoza trejkaz at trypticon.org
Wed Dec 29 08:06:38 CST 2004


On Thu, 30 Dec 2004 00:45, Mickael Remond wrote:
> Maxym Gorodetskyy wrote:
> > Well,  if I am using java?
>
> To parse stream you need an event-based parser (SAX support) and not a
> tree based parser (like DOM), because a tree-based parser need to have
> the complete document to build the tree in memory.
> Sax based parsing send events during parsing regarding opening/closing
> tags, contents, etc and can thus parse a stream (potentially infinite).
>
> In Java, Xerces support both mode for example.

There is a place in-between.  Parsers like XPP2 have the ability to build 
fragments of the tree as they do incremental parsing.  Plus, the added 
advantage of using pull parsing is that you have (almost) full control over 
the parser loop.

(I say "almost" because if your stream has something like "<stream:str" in it, 
the parser will usually halt waiting for the "eam>" unless you're really 
tricky. :-))

TX

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