# AGSNAMetrics.java

`package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGSNAMetrics {
/**
* Demonstrates computing various centrality metrics in a Social Network.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Create a fresh triple-store.
AllegroGraph ts = ags.renew("snametrics", AGPaths.TRIPLE_STORES);
// Register namespaces
ts.registerNamespace("ex", "http://example.org/");
// Load a small graph of data
AGLoadNtriples.loadNTriplesWithTiming(ts, AGPaths.dataSources("sna-doublediamond.nt"));
// Get an SNA extension instance for this store to work with SNA features
SNAExtension sna = ts.getSNAExtension();
// Register a generator
Object[] parts = new Object[2];
parts[0] = "objects-of";
parts[1] = "!ex:to";
sna.registerGenerator("to", parts);
// Define a group of actors
String[] group = {"!ex:a","!ex:b","!ex:c","!ex:d","!ex:e","!ex:f","!ex:g","!ex:h"};
// Show the Betweenness centrality of every actor in the group
for (int i=0;i<group.length;i++) {
double bc = sna.getBetweennessCentrality(group[i], group, "to");
System.out.println("Betweenness Centrality of " + group[i] + " is " + bc);
}
// Show the Closeness centrality of every actor in the group
for (int i=0;i<group.length;i++) {
double bc = sna.getClosenessCentrality(group[i], group, "to");
System.out.println("Closeness Centrality of " + group[i] + " is " + bc);
}
// Show the Degree centrality of every actor in the group
for (int i=0;i<group.length;i++) {
double bc = sna.getDegreeCentrality(group[i], group, "to");
System.out.println("Degree Centrality of " + group[i] + " is " + bc);
}
// Close the store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
}
`

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