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Storage.java
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Storage.java
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package cz.cvut.kbss.ontodriver.jena.connector;
import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.exception.OntoDriverInitializationException;
import cz.cvut.kbss.ontodriver.jena.config.JenaConfigParam;
import cz.cvut.kbss.ontodriver.jena.config.JenaOntoDriverProperties;
import org.apache.jena.query.Dataset;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
abstract class Storage {
static final Logger LOG = LoggerFactory.getLogger(Storage.class);
final Configuration configuration;
Dataset dataset;
Storage(Configuration configuration) {
this.configuration = configuration;
}
void writeChanges() throws OntoDriverException {
// Do nothing by default
}
abstract void initialize();
Dataset getDataset() {
return dataset;
}
void close() {
// Do nothing by default
}
/**
* Creates a storage accessor according to the specified configuration.
*
* @param configuration Access configuration
* @return Storage accessor instance
* @throws OntoDriverInitializationException When storage type is not supported
*/
static Storage create(Configuration configuration) {
final String type = configuration.getProperty(JenaConfigParam.STORAGE_TYPE, JenaOntoDriverProperties.IN_MEMORY);
switch (type) {
case JenaOntoDriverProperties.IN_MEMORY:
return new MemoryStorage(configuration);
case JenaOntoDriverProperties.FILE:
return new FileStorage(configuration);
case JenaOntoDriverProperties.SDB:
case JenaOntoDriverProperties.TDB:
throw new UnsupportedOperationException("Not implemented yet.");
default:
throw new OntoDriverInitializationException("Unsupported storage type \'" + type + "\'.");
}
}
}