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AbstractStorageConnector.java
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AbstractStorageConnector.java
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package cz.cvut.kbss.ontodriver.jena.connector;
import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.util.Transaction;
abstract class AbstractStorageConnector implements StorageConnector {
final Configuration 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(Configuration configuration) {
this.configuration = configuration;
initialize();
this.open = true;
}
@Override
public synchronized void close() {
this.open = false;
}
@Override
public boolean isOpen() {
return open;
}
void verifyOpen() {
if (!open) {
throw new IllegalStateException("This connector is closed.");
}
}
/**
* Initializes this connector.
* <p>
* Does nothing by default.
*/
void initialize() {
// Do nothing
}
<T> T unwrap(Class<T> cls) {
if (cls.isAssignableFrom(Storage.class)) {
return cls.cast(storage);
}
throw new UnsupportedOperationException("Unwrapping type " + cls + "not supported.");
}
}