Andy,
I tried to recreate what you discussed in this thread related to working with
prefixes in TDB, but it didn't work for me. I want to collect prefixes from
default graph of a dataset as well as all other named graphs from the same
dataset. Note that similar code works fine with non-transactional tdb-0.8.9.jar
I'm using jena-arq-2.9.0-incubating.jar jena-core-2.7.0-incubating.jar
jena-iri-0.9.0-incubating.jar jena-tdb-0.9.0-incubating.jar.
Please would you take a look at the following code and give me a hint about
what I am doing wrong.
Milorad
=======================================================
import java.io.File;
import java.util.Iterator;
import java.util.Map;
import org.openjena.atlas.lib.FileOps;
import com.hp.hpl.jena.query.Dataset;
import com.hp.hpl.jena.query.ReadWrite;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.reasoner.ReasonerRegistry;
import com.hp.hpl.jena.shared.Lock;
import com.hp.hpl.jena.shared.PrefixMapping;
import com.hp.hpl.jena.sparql.core.DatasetPrefixStorage;
import com.hp.hpl.jena.tdb.TDB;
import com.hp.hpl.jena.tdb.TDBFactory;
import com.hp.hpl.jena.tdb.base.block.FileMode;
import com.hp.hpl.jena.tdb.base.file.Location;
import com.hp.hpl.jena.tdb.sys.DatasetControlNone;
import com.hp.hpl.jena.tdb.sys.SetupTDB;
import com.hp.hpl.jena.tdb.sys.SystemTDB;
import com.hp.hpl.jena.update.UpdateAction;
import com.hp.hpl.jena.update.UpdateFactory;
import com.hp.hpl.jena.update.UpdateRequest;
public class rdfStorePrefixesTesting {
static File m_baseDir;
static Dataset m_dataset;
public static void prefixModel(Dataset dataset){
if(dataset!=null){
dataset.begin(ReadWrite.READ);
Location datasetLocation = new Location(m_baseDir.getPath());
System.out.println("Location of the dataset is: "+datasetLocation);
DatasetPrefixStorage prefixes =
SetupTDB.makePrefixes(datasetLocation, new DatasetControlNone()) ;
System.out.println("Prefix mapping is:
"+prefixes.getPrefixMapping());
System.out.println("graphNames in prefixes are:
"+prefixes.graphNames());
System.out.println("graphNames in dataset are: ");
for(Iterator<String> i = dataset.listNames();i.hasNext();){
String name = i.next();
System.out.println(name);
System.out.println("1:
"+dataset.getNamedModel(name).getNsPrefixMap());
System.out.println("2:
"+dataset.getNamedModel(name).getGraph().getPrefixMapping());
}
for ( String gn : prefixes.graphNames() ){
System.out.println("Graph: "+gn) ;
PrefixMapping pmap = prefixes.getPrefixMapping(gn) ;
Map<String, String> x = pmap.getNsPrefixMap() ;
for ( String k : x.keySet() )
System.out.println(k+":" + x.get(k)) ;
}
dataset.end();
}
}
public static void executeUpdateSPARQL(String graphName, String
querystr){
m_dataset.begin(ReadWrite.WRITE);
try {
UpdateRequest updateRequest = UpdateFactory.create(querystr);
System.out.println("executeUpdateSPARQL: "+updateRequest);
Model m = m_dataset.getNamedModel(graphName);
UpdateAction.execute(updateRequest, m);
m_dataset.commit() ;
}catch (Exception e){
System.out.println(e);
} finally {
m_dataset.end();
}
}
/**
* @param args
*/
public static void main(String[] args) {
String baseDirPath = "C:\\Temp";
m_baseDir = new File(baseDirPath+File.separator+"tdb");
boolean succ = m_baseDir.exists() && m_baseDir.isDirectory();
if(!succ) succ = m_baseDir.mkdir();
if(!succ){
m_baseDir = null;
m_dataset = null;
System.err.print("Error opening/creating new folder: "+baseDirPath);
}else{
FileOps.clearDirectory(m_baseDir.getPath()) ;
m_dataset = TDBFactory.createDataset(m_baseDir.getPath()) ;
}
String querystr;
querystr = "LOAD <http://geni-orca.renci.org/owl/ben-6509.rdf>";
System.err.println("Running "+querystr);
executeUpdateSPARQL("http://geni-orca.renci.org/owl/ben-6509.rdf";,
querystr);
System.err.println("==== finished ====");
querystr = "LOAD <http://geni-orca.renci.org/owl/nlr.rdf>";
System.err.println("Running "+querystr);
executeUpdateSPARQL("http://geni-orca.renci.org/owl/nlr.rdf";,
querystr);
System.err.println("==== finished ====");
prefixModel(m_dataset);
m_dataset.close();
}
}
=======================================================
>________________________________
> From: Andy Seaborne <[email protected]>
>To: [email protected]
>Sent: Thursday, April 12, 2012 3:24 PM
>Subject: Re: PrefixMapping from TDB
>
>On 12/04/12 14:12, Emilio Miguelanez wrote:
>> Hello Andy,
>>
>> The prefixes.dat is zero.
>>
>> For reference, I use tbdloader2 (I believe it is better than tdbloader), and
>> it uses a rdf file to populate the tdb
>>
>> I used your code and it worked quite well. I managed to retrieve the
>> prefixes, and the prefixes.dat is not zero now
>>
>> So I guess this piece of code is a work around to the issue with bulkloader.
>
>Yes - you can non-bulkloadd a data file of prefixes (no need for any
>triples).
>
> Andy
>
>>
>> cheers,
>> Emilio
>>
>> On 12 Apr 2012, at 11:53, Andy Seaborne wrote:
>>
>>> On 11/04/12 14:58, Emilio Miguelanez wrote:
>>>> Hi,
>>>>
>>>> How can I get the prefixes from the TDB store using latest tdb version
>>>> 0.9.0?
>>>>
>>>> Previously, using version 0.8.10, I managed to get the prefixes using the
>>>> following code
>>>>
>>>> Model bModel = TDBFactory.createModel(repoDir);
>>>> OntModel aModel = ModelFactory.createOntologyModel(spec, bModel);
>>>> Map<String, String> prefixMap = new HashMap<String, String>();
>>>> prefixMap = aModel.getNsPrefixMap();
>>>>
>>>>
>>>> Now, with the latest version and in order to support transactions, the
>>>> code has changed to:
>>>>
>>>> Dataset aDataset = TDBFactory.createDataset(repoDir);
>>>> Map<String, String> prefixMap = new HashMap<String, String>();
>>>> Model model = dataset.getDefaultModel();
>>>> prefixMap = model.getNsPrefixMap();
>>>>
>>>> but it doesn't retrieve all prefixes from the model.
>>>>
>>>> Should I use a different method or API to retrieve the prefixes stored in
>>>> the tdb?
>>>>
>>>>
>>>> Cheers,
>>>> Emilio
>>>
>>> Hi there,
>>>
>>> There is a problem with the bulkloader (see JIRA JENA-175).
>>>
>>> Could you look in the DB directory and see if the prefixes.dat is zero or
>>> not?
>>>
>>> I tried the code below and (on a disk-backed database) and it printed the
>>> prefixes:
>>>
>>> Andy
>>>
>>>
>>> -----------------------------
>>> package dev;
>>>
>>> import java.util.Map ;
>>>
>>> import org.openjena.atlas.lib.FileOps ;
>>> import org.openjena.riot.SysRIOT ;
>>>
>>> import com.hp.hpl.jena.query.Dataset ;
>>> import com.hp.hpl.jena.query.DatasetFactory ;
>>> import com.hp.hpl.jena.query.ReadWrite ;
>>> import com.hp.hpl.jena.shared.PrefixMapping ;
>>> import com.hp.hpl.jena.sparql.core.DatasetGraph ;
>>> import com.hp.hpl.jena.sparql.core.DatasetPrefixStorage ;
>>> import com.hp.hpl.jena.tdb.TDB ;
>>> import com.hp.hpl.jena.tdb.TDBFactory ;
>>> import com.hp.hpl.jena.tdb.store.DatasetGraphTDB ;
>>> import com.hp.hpl.jena.tdb.sys.DatasetControlNone ;
>>> import com.hp.hpl.jena.tdb.sys.SetupTDB ;
>>> import com.hp.hpl.jena.tdb.transaction.DatasetGraphTransaction ;
>>> import com.hp.hpl.jena.util.FileManager ;
>>>
>>> public class Jena_TDB_prefixes
>>> {
>>> public static void main(String ... argv)
>>> {
>>> FileOps.clearDirectory("DB") ;
>>> SysRIOT.wireIntoJena() ;
>>> DatasetGraphTransaction dsg =
>>>(DatasetGraphTransaction)TDBFactory.createDatasetGraph("DB") ;
>>> Dataset ds = DatasetFactory.create(dsg) ;
>>> ds.begin(ReadWrite.WRITE) ;
>>> FileManager.get().readModel(ds.getDefaultModel(), "D.ttl") ;
>>> ds.commit() ;
>>> ds.end() ;
>>>
>>> System.out.println("Prefixes (DS):") ;
>>>
>>> DatasetPrefixStorage prefixes =
>>>SetupTDB.makePrefixes(dsg.getLocation(), new DatasetControlNone()) ;
>>> for ( String gn : prefixes.graphNames() )
>>> {
>>> System.out.println("Graph: "+gn) ;
>>> PrefixMapping pmap = prefixes.getPrefixMapping(gn) ;
>>> Map<String, String> x = pmap.getNsPrefixMap() ;
>>> for ( String k : x.keySet() )
>>> System.out.printf(" %-10s %s\n", k+":", x.get(k)) ;
>>> }
>>>
>>>
>>> System.out.println("Prefixes (dft model):") ;
>>> ds.begin(ReadWrite.READ) ;
>>> Map<String, String> mapping = ds.getDefaultModel().getNsPrefixMap() ;
>>> System.out.println(mapping) ;
>>>
>>> ds.end() ;
>>> }
>>> }
>>>
>>> -----------------------------
>>> ---- D.ttl
>>> @prefix dc:<http://purl.org/dc/elements/1.1/> .
>>> @prefix ns:<http://example.org/ns#> .
>>>
>>> @prefix :<http://example.org/book/> .
>>>
>>> :s :p :o .
>>>
>>
>
>
>
>
