Re: Parsing HTML

On Wednesday 26 March 2003 18:33, Ben Sinclair wrote:
> Is there good documentation on how to do [ automatic reloading 
> of *ML pages ]? 

Sorry, there's not much documentation at the site yet, I didn't get around to 
document the new features. Maybe you want to write a howto based on your 
experiences?

Anyway, here's the basiscs that should get you going:

Prerequisites:
- Use XMLC 2.2. Either from CVS, or the binary package provided by David Li
- When you initally compile the pages, pass the "-for-deferred-parsing" option
   to XMLC

For the following, I'm assuming that you use XMLC in a servlet environment. In 
this case, the XMLC factory settings are controlled by servlet context 
parameters specified in web.xml. A detailed list of the availalbe parameters 
is included in the javadocs for org.enhydra.xml.xmlc.servlet.XMLCContext. 
Here are the most important ones pertaining to auto reloading:

- xmlcReloading: Must have the value "reparse" to enable on-the-fly reparsing
- xmlcReparseResourceDirs: A list of directories that XMLC uses to find HTML 
  files. Set this to your HTML document root (or document roots, you can
  specify a path here - XMLC will use the first matching file it finds on this
  path)

Let's assume you store your HTML pages in "/my/document/root", and you've got 
a page named "myPage.html". You've compiled the page with XMLC for deferred 
parsing which gave you the XMLC class "myPageHTML", and you've put a context 
parameter entry in web.xml that sets the reparse resource dir to  
"/my/document/root".

Here's what you need do in the servlet doGet() method in order to access the 
page:

// Get the XMLC context. "this" is the servlet.
XMLCContext ctx = XMLCContext.getContext(this); 
// Get the XMLC factory from the context
XMLCFactory factory = ctx.getXMLCFactory();
// Get the page
MyPageHTML page = (MyPageHTML)factory.create(MyPageHTML.class);

The factory automatically takes care of reparsing the HTML every time that 
either "/my/document/root/myPage.html" or "/my/document/root/mypage.xmlc" is 
changed. Changes are detected by checking the last modified timestamp of the 
files against the time of the last reparse, so you can force a reparse simply 
by touching the file.

Hope this helps,

Richard
-- 
Richard Kunze 

[ t]ivano Software, Bahnhofstr. 18, 63263 Neu-Isenburg
Tel.: +49 6102 80 99 07 - 0, Fax.: +49 6102 80 99 07 - 1
http://www.tivano.de, kunze@xxxxxxxxx

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