JavaExternalJoin.java

External join.This example shows how to use external joins between graphs. Its source code is under the samples/java directory.

import cogitant.base.Environment;
import cogitant.base.IOHandler;
import cogitant.base.EnvironmentObject;
import cogitant.base.Graph;
import cogitant.base.GraphObject;
import java.io.FileInputStream;
import java.util.Collection;
import java.util.Vector;

public class JavaExternalJoin
{
    public static void run(String prefix) throws Exception
    {
        // Load support and graphs
        Environment environment = new cogitant.jni.Environment();
        environment.setIOConfig(IOHandler.ConfigPropertyBool.KEEPGRAPHOBJECTIDENTIFIERS, true);
        environment.loadSupport(new FileInputStream(prefix + "/bcgct/sisyphus/sisyphus.bcs"), IOHandler.Format.BCGCT);
        Collection<EnvironmentObject> loadedgraphs = environment.loadObjects(new FileInputStream(prefix + "/bcgct/sisyphus/query_noanswer.bcg"), IOHandler.Format.BCGCT);
        Graph g1 = loadedgraphs.iterator().next().asGraph();
        loadedgraphs = environment.loadObjects(new FileInputStream(prefix + "/bcgct/sisyphus/query.bcg"), IOHandler.Format.BCGCT);
        Graph g2 = loadedgraphs.iterator().next().asGraph();
        // A simple external join
        GraphObject cg1 = g1.findByIdentifier("c1");
        System.out.println(cg1);
        GraphObject cg2 = g2.findByIdentifier("c17");
        System.out.println(cg2);
        environment.graphExternalJoin(g1, cg1, g2, cg2);
        // Print result
        Vector<EnvironmentObject> vout = new Vector<EnvironmentObject>();
        vout.add(g1);
        System.out.println(environment.saveObjectsString(vout, IOHandler.Format.BCGCT));
    }
    
    public static void main(String args[]) throws Exception
    {
        String prefix = "..";
        if (args.length == 1)
            prefix = args[0];
        System.out.println("prefix: " + prefix);
        run(prefix);
    }
}