Re: Parsing an XML file in an archive
- From: Joe Shaw <joe joeshaw org>
- To: filterdex runbox com
- Cc: dashboard-hackers gnome org
- Subject: Re: Parsing an XML file in an archive
- Date: Sat, 21 Mar 2009 11:20:21 -0400
Hi,
On Wed, Mar 18, 2009 at 5:04 PM, <filterdex runbox com> wrote:
> I want to create a filter for Beagle! (Actually, several filters for different formats that are built
> similar….) I have red the documentation, but I cannot wrap my head around it. I hope some-
> one where will take the time to get me started!
If you haven't already, definitely the first place to look at is the
filter tutorial on the wiki:
http://beagle-project.org/Filter_Tutorial
That will hopefully give you an overview on the structure of the
Filter code, how to register it with Beagle, and how to test it.
> The format is simple: zipped files (with extensions other than .zip, but they are still just zips)
> Only one file of interest: meta.xml that contains strings that can be mapped to dc values.
Definitely take a look at the OpenOffice filter. OpenOffice files
follow this exact model: a zip file (with a different extension)
containing a bunch of XML files inside of it. The code is not the
easiest to follow, but it's a decent starting point:
http://svn.gnome.org/viewvc/beagle/trunk/beagle/Filters/FilterOpenOffice.cs?view=markup
Look at the core overridden Filter methods for a start: DoOpen(),
DoPullProperties(), DoPull(), and DoClose().
If I were writing this code today I might use XPath instead of walking
every node in the document, and if I had C# 3.0 support I might even
use Linq-to-XML on it. We're not officially supporting C# 3.0 yet,
although since it's fully supported in Mono 2.2 and 2.4 is coming out
soon, there's no reason why we couldn't make that jump.
Joe
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