AGOpenTripleStore.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
import com.franz.agbase.AllegroGraph.StoreAttribute;
public class AGOpenTripleStore {
/**
* Demonstrates basics of opening triple stores in various ways.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to the server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem.", e);
}
// Access a store -- default is read-write access
System.out.println("Access: open a store, creating if necessary.");
AllegroGraph ts = ags.access("existingstore", AGPaths.TRIPLE_STORES);
ts.closeTripleStore();
// Open a store -- default is read-write access
System.out.println("Open: open an existing store, error otherwise.");
ts = ags.open("existingstore", AGPaths.TRIPLE_STORES);
System.out.println("Triple store opened with " + ts.numberOfTriples() + " triples.");
// Close the triple store
ts.closeTripleStore(true);
// Open a store read-only
System.out.println("Open an existing store read-only.");
ts = new AllegroGraph(AGPaths.TRIPLE_STORES + "existingstore");
ts.setAttribute(StoreAttribute.READ_ONLY, true);
ags.open(ts);
// Try modifying the store, say by indexing it -- this should throw
// an exception
try {
System.out.println("Try to modify the read-only store by indexing it (this should throw an exception).");
ts.indexAllTriples();
} catch (Exception e) {
System.out.println(e.getLocalizedMessage());
}
// Disconnect from the server
System.out.println("Disconnecting from the server.");
ags.disable();
System.out.println("Done.");
}
}
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