Thanks for help. Here is the complete code to get the reference node work:
Node pictures = rootNode.addNode("pictures");
Node leonardo = pictures.addNode("leonardo");
leonardo.addMixin("mix:versionable");
rootNode.save();
Node classicTag = riootNode.addNode("tags").addNode("classic");
Node leonardoTagged = classicTag.addNode("leonardo");
leonardoTagged.setProperty("author_reference",
leonardo.getUUID(), PropertyType.REFERENCE);
rootNode.save()
assertEquals(leonardo,
leonardoTagged.getProperty("author_reference").getNode());
On Jan 25, 2008 12:13 AM, Brian Thompson <[EMAIL PROTECTED]> wrote:
> On Jan 24, 2008 2:58 PM, Daniele Dellafiore <[EMAIL PROTECTED]> wrote:
>
> > I have used jackrabbit for some time and now I want to clarify many
> > doubt about how to handle some problems and how to architect the
> > repository.
> >
> > Basically I am today wondering about referencing a node from another
> > node. mix:referenceable seems to be useful but I do not understand,
> > other than assigning the UUID, how can be useful. The UUID can be use
> > as "external key" on another node?
>
>
>
> mix:referenceable nodes can be set as properties of type Reference on other
> nodes.
>
>
>
>
> >
> > Let's clarify. I am confused and I accept some advice about some books
> > becouse all the few articles on the net do not help me in architecting
> > even a simple (but not demo) application.
> >
> > I begin the discussion here, anyway.
> >
> > My app stores Pictures. I also have the concept of Author and Artwork.
> > Relationship are simple:
> > Author has many Artwork
> > Artwork has many Pictures.
> >
> > In a relational, there are external keys. Here I can simply put all
> > the pictures in a path like
> >
> > //picasso/guernica/pic1.jpg
> >
> > then the node picasso will contain properties like date of birth and
> > death and so on, no need to have anything else.
> >
> > Then I want to introduce some label, or tag, to give a free
> > classification to pictures, authors and artwork.
> > I can add a property to every node with a String that contains the
> > tag, in a comma separated format, for example.
> >
> > Now, When I have to search all the pictures with a certain tag, I have
> > to make a query on that properties. I can also create a new hierarchy,
> > like
> >
> > //tags/pictures/pic1.jpg
> >
> > now, how can I connect that pic1.jpg, that is the node name, with the
> > actual node in the picasso/guernica/ tree?
> > I can write in //tags/pictures/pic1.jpg node the UUID of the
> > //picasso/guernica/pic1.jpg node? this is external key. Is this a good
> > way? I do not think so...
>
>
>
> pic1.jpg here would be a very simple node, containing only one property (of
> type Reference) whose value would be the UUID of pic1.jpg under the
> picasso/guernica/ tree. To use this, you'd do something like:
>
> Node fakePic = root.getNode("//tags/pictures/pic1.jpg");
> Node realPic = fakePic.getProperty("imgReference").getNode();
>
> and then realPic would be the node from the /picasso/guernica/ tree.
>
>
>
> >
> >
> > Thanks.
> >
> > --
> > Daniele Dellafiore
> > http://blog.ildella.net/
> >
>
>
> Hope this helps,
>
> -Brian
>
--
Daniele Dellafiore
http://blog.ildella.net/
