# AGJenaGraphMakerInterface.java

`package com.franz.agjena.examples;
import com.franz.agbase.AllegroGraph;
import com.franz.agbase.AllegroGraphConnection;
import com.franz.agbase.AllegroGraphException;
import com.franz.agbase.examples.AGPaths;
import com.franz.agjena.AllegroGraphGraphMaker;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.GraphMaker;
import com.hp.hpl.jena.shared.ReificationStyle;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
public class AGJenaGraphMakerInterface {
/**
* Demonstrates the Jena GraphMaker interface to AllegroGraph.
*
* @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 fresh triple stores
AllegroGraph ts1 = ags.renew("store1", AGPaths.TRIPLE_STORES);
AllegroGraph ts2 = ags.renew("store2", AGPaths.TRIPLE_STORES);
// Create a GraphMaker (a Graph factory) for each store.
GraphMaker maker1 = new AllegroGraphGraphMaker(ts1);
GraphMaker maker2 = new AllegroGraphGraphMaker(ts2);
// Show the default graph for maker1
Graph defaultGraph1 = maker1.getGraph();
showGraphName(defaultGraph1);
// Show the default graph for maker2
Graph defaultGraph2 = maker2.getGraph();
showGraphName(defaultGraph2);
// Show an anonymous graph for maker1
Graph anonGraph1a = maker1.createGraph();
showGraphName(anonGraph1a);
// Show another anonymous graph for maker1
Graph anonGraph1b = maker1.createGraph();
showGraphName(anonGraph1b);
// Show an anonymous graph for maker2
Graph anonGraph2a = maker2.createGraph();
showGraphName(anonGraph2a);
// Show another anonymous graph for maker2
Graph anonGraph2b = maker2.createGraph();
showGraphName(anonGraph2b);
// Show a named graph foo in maker1
Graph foo1 = maker1.createGraph("http://example.org/foo", true);
showGraphName(foo1);
// Try to strict-create another named graph foo in maker1
// Uncommenting this should throw an exception.
/*
try {
Graph foo1b = maker1.createGraph("http://example.org/foo", true);
showGraph(foo1b);
} catch (Exception e) {
System.out.println("This is an expected exception: ");
e.printStackTrace();
}
*/
// Show a named graph foo in maker2
Graph foo2 = maker2.createGraph("http://example.org/foo", true);
showGraphName(foo2);
// List the graphs in maker1
ExtendedIterator it1 = maker1.listGraphs();
while (it1.hasNext()) {
System.out.println(it1.next());
}
// List the graphs in maker2
ExtendedIterator it2 = maker2.listGraphs();
while (it2.hasNext()) {
System.out.println(it2.next());
}
// Show the default reification style
ReificationStyle rs = maker1.getReificationStyle();
System.out.println("ReificationStyle: " + rs.toString());
// Close the triple stores and disconnect from the server
ts1.closeTripleStore();
ts2.closeTripleStore();
ags.disable();
}
public static void showGraphName(Graph g) {
System.out.println(g.toString());
}
}
`

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