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JenaDataSource.java
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JenaDataSource.java
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package cz.cvut.kbss.ontodriver.jena;
import cz.cvut.kbss.ontodriver.Connection;
import cz.cvut.kbss.ontodriver.OntologyStorageProperties;
import cz.cvut.kbss.ontodriver.ReloadableDataSource;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
public class JenaDataSource implements ReloadableDataSource {
private volatile boolean open = true;
private OntologyStorageProperties storageProperties;
private Map<String, String> properties;
private JenaDriver driver;
@Override
public synchronized Connection getConnection() {
ensureOpen();
if (driver == null) {
connect();
}
return driver.acquireConnection();
}
private void ensureOpen() {
if (!open) {
throw new IllegalStateException("The data source is closed.");
}
}
private void connect() {
if (storageProperties == null) {
throw new IllegalStateException("Data source cannot connect without ontology storage properties.");
}
this.driver = new JenaDriver(storageProperties, properties != null ? properties : Collections.emptyMap());
}
@Override
public synchronized void setStorageProperties(OntologyStorageProperties storageProperties) {
this.storageProperties = Objects.requireNonNull(storageProperties);
}
@Override
public synchronized void setProperties(Map<String, String> properties) {
this.properties = Objects.requireNonNull(properties);
}
@Override
public void close() throws OntoDriverException {
if (!open) {
return;
}
try {
if (driver != null) {
driver.close();
}
} finally {
this.open = false;
}
}
@Override
public boolean isOpen() {
return open;
}
@Override
public void reload() throws JenaDriverException {
ensureOpen();
driver.reloadStorage();
}
}