Re: [Tracker] Using tracker extractors from other applications

[Nikolaus Rath <Nikolaus rath org>]

Ivan Frade <ivan frade-Re5JQEeQqe8AvxtiuMwx3w public gmane org> writes:
> Hi,
>
> On Wed, Nov 17, 2010 at 5:16 PM, Nikolaus Rath <Nikolaus-BTH8mxji4b0 public gmane org> wrote:
>
> > Martyn Russell <martyn-bhGbAngMcJvQT0dZR+AlfA-XMD5yJDbdMReXY1tMh2IBg public gmane 
> > org<martyn-bhGbAngMcJvQT0dZR%2BAlfA-XMD5yJDbdMReXY1tMh2IBg public gmane org>>
> > writes:
> > > On 17/11/10 00:02, Nikolaus Rath wrote:
> > This gives me the following result:
> >
> > ...
> >
> > So it seems that I still have to parse the entire string. Is there a way
> > to get the data in more structured form?
>
>  We have code in python doing that for our extraction test cases. Check the
> class ExtractorHelper in:
>
> http://git.gnome.org/browse/tracker/tree/tests/functional-tests/common/utils/helpers.py
>
>   Basically:
> extractor = ExtractorHelper ()
> results = extractor.get_metadata (filename)
>
> results is a dictionary with property as key, and a list of values as value.
> There are few tricks in the translation property->key (because of anonymous
> nodes)... but i think that with some prints you can figure out how it works.

This seems to work fine for the OpenOffice file:

In [39]: tracker_helper.ExtractorHelper().get_metadata('file:///home/nikratio/misc/Transaktionen.ods', 
'').keys()
Out[39]: 
[u'a',
 u'nie:generator',
 u'nie:plainTextContent',
 u'nco:publisher',
 u'nie:contentCreated']

but for the plain text file, there are no contents:

In [42]: tracker_helper.ExtractorHelper().get_metadata('file:///home/nikratio/misc/victoria.tex', '').keys()
Out[42]: [u'a']

Even though tracker itself returns the contents:

In [48]:     proxy = bus.get_object('org.freedesktop.Tracker1.Extract', 
                                    '/org/freedesktop/Tracker1/Extract')
             tracker = dbus.Interface(proxy, 'org.freedesktop.Tracker1.Extract')
             tracker.GetMetadata('file:///home/nikratio/misc/victoria.tex', '')
Out[52]: 
(dbus.String(u''),
 dbus.String(u' a nfo:PlainTextDocument ;\n\t nie:plainTextContent "blablabla" .\n'))


Is this a bug in  ExtractorHelper?


Best,
 
   -Nikolaus

-- 
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