Converter problem when using RDF.ID/asString.set

[Mauricio Banduk]

Hi guys,

  I'm facing a problem which I believe is simple to solve, maybe I just have not understood how it works..

I have a Vocabulary that looks like this:

object MyVocabulary extends Vocabulary("http://myvocabulary.com#") {

  val Computer       = uriref("Car")

  val ConsumptionEvt = uriref("ConsumtionEvt")

  val consumption    = prop("consumption")

  val timeStamp      = prop("timeStamp")

}

Then I create nodes this way: 

def buildEvent(subjId : String, prop : Property[Int], obj : Node, ts : TypedLiteral) : Graph = {

       Graph(MyVocabulary(subjId) - (

    RDF.Type -> MyVocabulary.Computer,

    RDF.ID   -> objId,

    MyVocabulary.ConsumptionEvt -> Branch(

      consumption -> obj,

      MyVocabulary.timeStamp -> ts

    )

  ))

}

and then add them into the graph using graph = graph ++buildEvent(....)

The problem is that when I try to select all the distinct computers from my graph, I try the following code

val pcs = graph /-/ having(RDF.Type ->MyVocabulary.Computer) / RDF.ID / asString.set

I get the following error:

overloaded method value / with alternatives:

[T](nc: org.scardf.NodeToValueConverter[T])T <and> 

[T](bc: org.scardf.NodeBagConverter[T])T <and> 

(predicate: org.scardf.UriRef)org.scardf.NodeBag cannot be applied to (net.croz.scardf.NodeBagConverter[Set[String]])

I managed with the following code, but I'm sure there's a way to use the scardf lib to do this:

val pcs = graph /-/ having(RDF.Type ->MyVocabulary.Computer) / RDF.ID

for (id <- pcs) yield id.rend

Could anyone give me a hint on it??

Thank you,

Cheers,

Banduk

[Hrvoje Šimić]

The expression

graph /-/ having(RDF.Type ->MyVocabulary.Computer) / RDF.ID / asString.set

should work as expected.

You should post a complete and minimised version of your code that doesn't work.

Hrvoje

[Mauricio Banduk]

Hi,

So, I tested and it really doesn't work.

But if I create a property  val id = propStr("id") on my vocabulary and then do  

graph /-/ having(RDF.Type -> MyVocabulary.Computer) / MyVocabulary.id.set

it works!

I've put almost all my cote in the first e-mail, but if yoiu think it would help to send all the code, I can do it.

Thank you,

Banduk

2012/2/24 Hrvoje Šimić <hrvoj...@gmail.com>

[Hrvoje Šimić]

Have you tested it with the version from the trunk?

Please put the minimal code which exhibits this behaviour in a single
.scala file that can be executed (main or test). And state your exact
versions of Scardf, Scala and Java.

Hrvoje

[Mauricio Banduk]

Hi,

Sorry about the delay, I had to do other things and to left it for later..

So, I found my problem. I was using the old api converters cause Eclipse was not proposing the import of the new one. 

This is probably because it's an implicit declaration and not a method definition.

You show this import at http://code.google.com/p/scardf/wiki/Converters (in the properties section) but I haven't  noticed...

Cheers,

Banduk

2012/2/28 Hrvoje Šimić <hrvoj...@gmail.com>

--

Maurício Banduk