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JenaStatement.java
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JenaStatement.java
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package cz.cvut.kbss.ontodriver.jena.query;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.Statement;
import cz.cvut.kbss.ontodriver.jena.connector.StatementExecutor;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import org.apache.jena.query.Query;
import org.apache.jena.query.QueryFactory;
import org.apache.jena.query.QueryParseException;
import java.util.Objects;
public class JenaStatement implements Statement {
private final StatementExecutor executor;
// We are not using the target ontology setting at the moment
private StatementOntology targetOntology = StatementOntology.CENTRAL;
private boolean open = true;
private AbstractResultSet currentResultSet;
public JenaStatement(StatementExecutor executor) {
this.executor = executor;
}
@Override
public ResultSet executeQuery(String sparql) throws JenaDriverException {
ensureOpen();
final Query query = parseQuery(Objects.requireNonNull(sparql));
closeCurrentResultSet();
final AbstractResultSet resultSet;
if (query.isAskType()) {
resultSet = executor.executeAskQuery(query);
} else {
resultSet = executor.executeSelectQuery(query);
}
resultSet.setStatement(this);
this.currentResultSet = resultSet;
return resultSet;
}
void ensureOpen() {
if (!open) {
throw new IllegalStateException("Statement is closed.");
}
}
private Query parseQuery(String sparql) throws JenaDriverException {
try {
return QueryFactory.create(sparql);
} catch (QueryParseException e) {
throw new JenaDriverException("Unable to parse query " + sparql, e);
}
}
private void closeCurrentResultSet() throws JenaDriverException {
if (currentResultSet != null) {
currentResultSet.close();
this.currentResultSet = null;
}
}
@Override
public void executeUpdate(String sparql) throws JenaDriverException {
ensureOpen();
Objects.requireNonNull(sparql);
closeCurrentResultSet();
executor.executeUpdate(sparql);
}
@Override
public void useOntology(StatementOntology ontology) {
ensureOpen();
this.targetOntology = Objects.requireNonNull(ontology);
}
@Override
public StatementOntology getStatementOntology() {
return targetOntology;
}
@Override
public void close() throws JenaDriverException {
this.open = false;
closeCurrentResultSet();
}
@Override
public boolean isOpen() {
return open;
}
}