AGSNAGenerators.java

package com.franz.ag.examples;

import com.franz.ag.*;

public class AGSNAGenerators {

    /**
     * Demonstrates some basics of using generators 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("snagenerators", AGPaths.TRIPLE_STORES);
        
        // Register namespaces
        ts.registerNamespace("ex", "http://example.org/");
        
        // Load a small graph of data
        AGUtils.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 an objects-of generator
        Object[] parts = new Object[2];
        parts[0] = "objects-of";
        parts[1] = "!ex:to";
        sna.registerGenerator("to-objects", parts);
        
        // Register a subjects-of generator
        parts[0] = "subjects-of";
        parts[1] = "!ex:to";
        sna.registerGenerator("to-subjects", parts);
        
        // Register an undirected generator
        parts[0] = "undirected";
        parts[1] = "!ex:to";
        sna.registerGenerator("to-undirected", parts);
        
        // Define a group of actors
        String[] group = {"!ex:a","!ex:b","!ex:c","!ex:d","!ex:e","!ex:f","!ex:g","!ex:h"};
        
        // And the list of generators
        String[] generators = {"to-objects","to-subjects","to-undirected"};
        
        // Show the nodal degrees of each node with respect to each generator 
        for (int i=0;i<group.length;i++) {
            for (int j=0;j<generators.length;j++){
                long nodalDegree = sna.getNodalDegree(group[i], generators[j]);
                System.out.println("Nodal Degree of " + group[i] + " using " + generators[j] + " is " + nodalDegree);
            }
        }

        // Show the nodal neighbors of each node with respect to each generator
        for (int i=0;i<group.length;i++) {
            for (int j=0;j<generators.length;j++){
                UPI[] nodalNeighbors = sna.getNodalNeighbors(group[i], generators[j]);
                System.out.println("Nodal Neighbors of " + group[i] + " using " + generators[j] + " are " 
                        + AGUtils.upiArrayToString(ts,nodalNeighbors));
            }
        }

        // Close the store and disconnect from the server.
        ts.closeTripleStore();
        ags.disable();
    }

}

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