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AbstractStorageConnector.java
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AbstractStorageConnector.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
*
* 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.
*
* 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.jena.connector;
import cz.cvut.kbss.ontodriver.config.DriverConfiguration;
import cz.cvut.kbss.ontodriver.util.Transaction;
import org.apache.jena.query.Dataset;
/**
* Base implementation of the {@link StorageConnector} interface.
*/
abstract class AbstractStorageConnector implements StorageConnector {
final DriverConfiguration configuration;
final Transaction transaction = new Transaction();
private volatile boolean open;
Storage storage;
/**
* Constructs this connector without using any configuration.
*/
AbstractStorageConnector() {
this.configuration = null;
initialize();
this.open = true;
}
AbstractStorageConnector(DriverConfiguration configuration) {
this.configuration = configuration;
initialize();
this.open = true;
}
Storage getStorage() {
return storage;
}
@Override
public synchronized void close() {
this.open = false;
}
@Override
public boolean isOpen() {
return open;
}
void ensureOpen() {
if (!open) {
throw new IllegalStateException("This connector is closed.");
}
}
/**
* Initializes this connector.
* <p>
* Does nothing by default.
*/
void initialize() {
// Do nothing
}
@Override
public <T> T unwrap(Class<T> cls) {
if (cls.isAssignableFrom(getClass())) {
return cls.cast(this);
} else if (cls.isAssignableFrom(Dataset.class)) {
return cls.cast(storage.getDataset());
}
throw new UnsupportedOperationException("Unwrapping type " + cls + "not supported.");
}
}