TDB Assembler setup

[Claude Warren <cl...@xenei.com>]

I am working at creating an Assembler for the JenaSecurity package.  I
have the assembler class working if I add

@prefix sec:		<http://xenei.org/jena/security/Assembler#> .
<>	ja:loadClass	"org.xenei.jena.security.SecuredAssembler" .
sec:Model
	rdfs:subClassOf ja:NamedModel ;
	 .

to the assembly TTL file.  I would like to get this to work like the
TDB system does.

I looked through the TDB.init() code tracing from the
initialization1(), but I can't find where

tdb:GraphTDB    rdfs:subClassOf  ja:Model .

is added to the assembler graph when TDB initializes.  Can anyone
point me to where this magic happens?

-- Claude


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Re: TDB Assembler setup

[Andy Seaborne <an...@apache.org>]

On 26/12/12 21:26, Claude Warren wrote:
> I am working at creating an Assembler for the JenaSecurity package.  I
> have the assembler class working if I add
>
> @prefix sec:		<http://xenei.org/jena/security/Assembler#> .
> <>	ja:loadClass	"org.xenei.jena.security.SecuredAssembler" .
> sec:Model
> 	rdfs:subClassOf ja:NamedModel ;
> 	 .
>
> to the assembly TTL file.  I would like to get this to work like the
> TDB system does.
>
> I looked through the TDB.init() code tracing from the
> initialization1(), but I can't find where
>
> tdb:GraphTDB    rdfs:subClassOf  ja:Model .
>
> is added to the assembler graph when TDB initializes.  Can anyone
> point me to where this magic happens?

While most of the initialization is in TDB.init(), the triple:

 > tdb:GraphTDB    rdfs:subClassOf  ja:Model .

isn't added that way - it's declared

e.g the Fuseki configuration file has:
--------
# TDB
[] ja:loadClass "com.hp.hpl.jena.tdb.TDB" .
tdb:DatasetTDB  rdfs:subClassOf  ja:RDFDataset .
tdb:GraphTDB    rdfs:subClassOf  ja:Model .
--------


The subClassOf relationship get added by the assembler machinery itself 
from the description.

The subClassOf relationships are only needed if the system is making a 
compound structure (e.g. reasoner or general datatset) and needs a 
ja:Model and it should, come from a TDB tdb:GraphTDB.

When making directly, e.g. the TDB assembling it's datasets from a 
description, the code is looking for a tdb:DatasetTDB directly and so 
subClass isn't needed.

When Fuskei is making a dataset, it wants a ja:RDFDataset so there the 
subClassOf is needed.

	Hope that makes sense,
	Andy

>
> -- Claude
>
>