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NIHVIVO-3847 null pointer exception when try to create a new model from ingest menu

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stellamit 2012-06-27 21:45:40 +00:00
parent b3d3a870ac
commit 720228b6a9
1 changed files with 44 additions and 13 deletions
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57
webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/RDFServiceModelMaker.java
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@ -15,10 +15,6 @@ import org.apache.commons.logging.LogFactory;
import com.hp.hpl.jena.graph.GraphMaker;
import com.hp.hpl.jena.query.Dataset;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelMaker;
@ -27,11 +23,8 @@ import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.Statement;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.sdb.SDBFactory;
import com.hp.hpl.jena.sdb.Store;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
import com.hp.hpl.jena.util.iterator.WrappedIterator;
import com.hp.hpl.jena.vocabulary.RDFS;
import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFService;
import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFServiceException;
@ -39,7 +32,7 @@ import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFServiceFactory;
public class RDFServiceModelMaker implements ModelMaker {
private final static Log log = LogFactory.getLog(VitroJenaSDBModelMaker.class);
private final static Log log = LogFactory.getLog(RDFServiceModelMaker.class);
private RDFServiceFactory rdfServiceFactory;
@ -49,10 +42,21 @@ public class RDFServiceModelMaker implements ModelMaker {
public static final String HAS_NAMED_MODEL_URI =
"http://vitro.mannlib.cornell.edu/ns/vitro/sdb/hasNamedModel";
private Resource sdbResource; // a resource representing the SDB database
private Resource dbResource; // a resource representing the triple store
public RDFServiceModelMaker(RDFServiceFactory rdfServiceFactory) {
this.rdfServiceFactory = rdfServiceFactory;
RDFService rdfService = rdfServiceFactory.getRDFService();
if (rdfService != null) {
try {
setUpMetadata(rdfService);
} catch (RDFServiceException se) {
log.error("unable to set up the cache of graph names");
} finally {
rdfService.close();
}
}
}
protected RDFService getRDFService() {
@ -64,7 +68,7 @@ public class RDFServiceModelMaker implements ModelMaker {
}
public void close() {
// n.a.
// getRDFService().close(); ?
}
public Model createModel(String modelName) {
@ -72,7 +76,7 @@ public class RDFServiceModelMaker implements ModelMaker {
Model metadataModel = getMetadataModel();
try {
metadataModel.add(
sdbResource,metadataModel.getProperty(
dbResource,metadataModel.getProperty(
HAS_NAMED_MODEL_URI), modelName);
} finally {
metadataModel.close();
@ -94,7 +98,7 @@ public class RDFServiceModelMaker implements ModelMaker {
Model metadataModel = getMetadataModel();
try {
StmtIterator stmtIt = metadataModel.listStatements(
sdbResource, metadataModel.getProperty(
dbResource, metadataModel.getProperty(
HAS_NAMED_MODEL_URI), arg0);
try {
return stmtIt.hasNext();
@ -161,7 +165,7 @@ public class RDFServiceModelMaker implements ModelMaker {
m.removeAll(null,null,null);
Model metadataModel = getMetadataModel();
try {
metadataModel.remove(sdbResource, metadataModel.getProperty(
metadataModel.remove(dbResource, metadataModel.getProperty(
HAS_NAMED_MODEL_URI),metadataModel.createLiteral(arg0));
} finally {
metadataModel.close();
@ -241,4 +245,31 @@ public class RDFServiceModelMaker implements ModelMaker {
this.getClass().getName());
}
private void setUpMetadata(RDFService rdfService) throws RDFServiceException {
Model metadataModel = getMetadataModel();
if (metadataModel.size() == 0) {
// set up the model name metadata to avoid expensive calls to
// listNames()
Resource resource = metadataModel.createResource();
this.dbResource = resource;
List<String> graphNames = rdfService.getGraphURIs();
Iterator<String> nameIt = graphNames.iterator();
while (nameIt.hasNext()) {
String name = (String) nameIt.next();
metadataModel.add(dbResource,metadataModel.getProperty(
HAS_NAMED_MODEL_URI),name);
}
} else {
StmtIterator stmtIt = metadataModel.listStatements(
(Resource) null, metadataModel.getProperty(
HAS_NAMED_MODEL_URI),(RDFNode) null);
if (stmtIt.hasNext()) {
Statement stmt = stmtIt.nextStatement();
dbResource = stmt.getSubject();
}
stmtIt.close();
}
}
}