| This class implements a label bureau.
The database for labels is provided by the underlying file system. The
organisation is as follows:
The LabelBureau is attached to some directory D. For
each service it handles, you have to create a subdirectory, according
to the service name (its identifying URL). So for example, if you want to
provide ratings as www.rating.com, you will have to create
a D/www.rating.com directory.
Uner this service directory, for each site you want to label,
you have to create a sub-directory. In our example, if our rating service
wants to label www.w3.org, you will have to create a
D/www.rating.com/www.w3.org directory. This directory
should reflect the space of the labeled server (ie having the same file
hierarchy), and each file should be the label itself (as transmited).
In our example, if the LabelBureau wants to find the label by
www.rating.com for http://www.w3.org/pub/WWW/Overview.html, it will look
for the file
D/www.rating.com/http/www.w3.org/pub/WWW/Overview.html-label
.
So, we really use the underlying file system as a database for labels.
FIXME: the LabelBureau should be an interface, same stands for the
LabelService and Label classes.
| 