@Override
public List<Node> getPredicates(Node subject, Node object) {
Model graph = null;
GraphConnection graphConnection = null;
try {
graphConnection = openGraph();
graph = graphConnection.getGraph();
graph.enterCriticalSection(Lock.READ);
SimpleSelector selector = getJenaSelector(graph, new StatementImpl(subject, null, object));
StmtIterator it = graph.listStatements(selector);
List<Statement> statements = getNXRelationsStatements(graph, it.toList());
List<Node> res = new ArrayList<Node>();
for (Statement stmt : statements) {
Node predicate = stmt.getPredicate();
if (!res.contains(predicate)) {
// remove duplicates
res.add(predicate);
}
}
return res;
} finally {
if (graph != null) {
graph.leaveCriticalSection();
}
if (graphConnection != null) {
graphConnection.close();
}
}
}
@Override
public void remove(List<Statement> statements) {
Model graph = null;
GraphConnection graphConnection = null;
try {
graphConnection = openGraph();
graph = graphConnection.getGraph();
graph.enterCriticalSection(Lock.WRITE);
for (Statement nuxStmt : statements) {
com.hp.hpl.jena.graph.Node subject = getJenaNode(nuxStmt.getSubject());
com.hp.hpl.jena.graph.Node predicate = getJenaNode(nuxStmt.getPredicate());
com.hp.hpl.jena.graph.Node object = getJenaNode(nuxStmt.getObject());
Triple jenaTriple = Triple.create(subject, predicate, object);
com.hp.hpl.jena.rdf.model.Statement jenaStmt = graph.asStatement(jenaTriple);
graph.remove(jenaStmt);
// remove properties
RSIterator it = graph.listReifiedStatements(jenaStmt);
while (it.hasNext()) {
ReifiedStatement rs = it.nextRS();
rs.removeProperties();
}
// remove quadlets
graph.removeAllReifications(jenaStmt);
// graph.removeReification(reifiedStmt);
}
} finally {
if (graph != null) {
graph.leaveCriticalSection();
}
if (graphConnection != null) {
graphConnection.close();
}
}
}
@Override
public void add(List<Statement> statements) {
Model graph = null;
GraphConnection graphConnection = null;
try {
graphConnection = openGraph();
graph = graphConnection.getGraph();
graph.enterCriticalSection(Lock.WRITE);
for (Statement nuxStmt : statements) {
com.hp.hpl.jena.graph.Node subject = getJenaNode(nuxStmt.getSubject());
com.hp.hpl.jena.graph.Node predicate = getJenaNode(nuxStmt.getPredicate());
com.hp.hpl.jena.graph.Node object = getJenaNode(nuxStmt.getObject());
Triple jenaTriple = Triple.create(subject, predicate, object);
com.hp.hpl.jena.rdf.model.Statement jenaStmt = graph.asStatement(jenaTriple);
// properties
Map<Resource, Node[]> properties = nuxStmt.getProperties();
if (properties == null || properties.isEmpty()) {
// no properties
graph.add(jenaStmt);
} else {
List<com.hp.hpl.jena.rdf.model.Statement> stmts =
new ArrayList<com.hp.hpl.jena.rdf.model.Statement>();
stmts.add(jenaStmt);
// create reified statement if it does not exist
com.hp.hpl.jena.graph.Node reifiedStmt = graph.getAnyReifiedStatement(jenaStmt).asNode();
for (Map.Entry<Resource, Node[]> property : properties.entrySet()) {
com.hp.hpl.jena.graph.Node prop = getJenaNode(property.getKey());
for (Node node : property.getValue()) {
com.hp.hpl.jena.graph.Node value = getJenaNode(node);
Triple propTriple = Triple.create(reifiedStmt, prop, value);
stmts.add(graph.asStatement(propTriple));
}
}
graph.add(stmts);
}
}
} finally {
if (graph != null) {
graph.leaveCriticalSection();
}
if (graphConnection != null) {
graphConnection.close();
}
}
}
/**
* Gets Jena statement selector corresponding to the NXRelations statement.
*
* @param graph the jena graph
* @param nuxStatement NXRelations statement
* @return jena statement selector
*/
private static SimpleSelector getJenaSelector(Model graph, Statement nuxStatement) {
com.hp.hpl.jena.rdf.model.Resource subjResource = null;
com.hp.hpl.jena.graph.Node subject = getJenaNode(nuxStatement.getSubject());
if (subject != null && subject.isURI()) {
subjResource = graph.getResource(subject.getURI());
}
Property predProp = null;
com.hp.hpl.jena.graph.Node predicate = getJenaNode(nuxStatement.getPredicate());
if (predicate != null && predicate.isURI()) {
predProp = graph.getProperty(predicate.getURI());
}
com.hp.hpl.jena.graph.Node object = getJenaNode(nuxStatement.getObject());
RDFNode objRDF = null;
if (object != null) {
objRDF = graph.asRDFNode(object);
}
return new SimpleSelector(subjResource, predProp, objRDF);
}
protected List<StatementInfo> getStatementsInfo(List<Statement> statements)
throws ClientException {
if (statements == null) {
return null;
}
List<StatementInfo> infoList = new ArrayList<StatementInfo>();
for (Statement statement : statements) {
Subject subject = statement.getSubject();
// TODO: filter on doc visibility (?)
NodeInfo subjectInfo = new NodeInfoImpl(subject, getDocumentModel(subject), true);
Resource predicate = statement.getPredicate();
Node object = statement.getObject();
NodeInfo objectInfo = new NodeInfoImpl(object, getDocumentModel(object), true);
StatementInfo info =
new StatementInfoImpl(statement, subjectInfo, new NodeInfoImpl(predicate), objectInfo);
infoList.add(info);
}
return infoList;
}