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Rdf4jDataSource.java
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Rdf4jDataSource.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.rdf4j;
import cz.cvut.kbss.ontodriver.Connection;
import cz.cvut.kbss.ontodriver.DataSource;
import cz.cvut.kbss.ontodriver.OntologyStorageProperties;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.rdf4j.exception.Rdf4jDriverException;
import org.eclipse.rdf4j.repository.Repository;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
public class Rdf4jDataSource implements DataSource {
private Rdf4jDriver driver;
private volatile boolean open = true;
private boolean connected;
private OntologyStorageProperties storageProperties;
private Map<String, String> properties;
@Override
public synchronized void close() throws OntoDriverException {
if (!open) {
return;
}
try {
if (connected) {
driver.close();
}
} finally {
this.open = false;
}
}
@Override
public boolean isOpen() {
return open;
}
@Override
public synchronized Connection getConnection() throws Rdf4jDriverException {
ensureOpen();
ensureConnected();
return driver.acquireConnection();
}
private void ensureOpen() {
if (!open) {
throw new IllegalStateException("The data source is closed.");
}
}
private void ensureConnected() throws Rdf4jDriverException {
if (connected) {
return;
}
if (storageProperties == null) {
throw new IllegalStateException("Cannot initialize OntoDriver without storageProperties configuration.");
}
if (properties == null) {
this.properties = Collections.emptyMap();
}
this.driver = new Rdf4jDriver(storageProperties, properties);
this.connected = true;
}
@Override
public void setStorageProperties(OntologyStorageProperties storageProperties) {
ensureOpen();
this.storageProperties = Objects.requireNonNull(storageProperties);
}
@Override
public void setProperties(Map<String, String> properties) {
ensureOpen();
this.properties = Objects.requireNonNull(properties);
}
/**
* Sets the underlying repository.
* <p>
* Note that this functionality is supported only for in-memory stores.
*
* @param repository The new repository
* @throws Rdf4jDriverException When setting repository fails
*/
public synchronized void setRepository(Repository repository) throws Rdf4jDriverException {
ensureOpen();
ensureConnected();
try {
driver.setRepository(repository);
} catch (IllegalArgumentException | IllegalStateException e) {
throw new Rdf4jDriverException(e);
}
}
}