# AGNamedGraphs.java

`package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGNamedGraphs {
/**
* Demonstrates some basics of working with named graphs.
*
* @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 for this example.
AllegroGraph ts = ags.renew("namedgraphs", AGPaths.TRIPLE_STORES);
// Register any namespaces
ts.registerNamespace("ex","http://example.org/");
// Add a triple to the default graph in the store
ts.addStatement("!ex:a", "!ex:p", "!ex:b");
// Add a triple to a named graph in the store
ts.addStatement("!ex:Dog","!rdf:type","!owl:Class","<http://animals.example.org>");
// Show all triples in all graphs in the store
System.out.println("Show all triples in all graphs in the store");
TriplesIterator cc = ts.getStatements(null, null, null, null);
AGUtils.showTriples(cc);
// Show all triples in a named graph in the store
System.out.println("Show all triples in graph http://animals.example.org");
cc = ts.getStatements(null, null, null, "<http://animals.example.org>");
AGUtils.showTriples(cc);
// Show all triples in the default graph
System.out.println("Show all triples in the default graph");
cc = ts.getStatements(null, null, null);
AGUtils.showTriples(cc);
// Another way of showing all triples in the default graph
System.out.println("Another way of showing all triples in the default graph");
cc = ts.getStatements(null, null, null, "");
AGUtils.showTriples(cc);
// Close the store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
}
`

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AGJenaNamedGraphs.java

# AGJenaNamedGraphs.java

`package com.franz.agjena.examples;
import java.util.Iterator;
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.franz.agjena.AllegroGraphModel;
import com.franz.agjena.AllegroGraphReasoner;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.rdf.model.Model;
public class AGJenaNamedGraphs {
/**
* Demonstrates using multiple named Graphs in store, and inference
*
* @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("jenatest4", AGPaths.TRIPLE_STORES);
// Get a Graph Maker for the store
AllegroGraphGraphMaker maker = new AllegroGraphGraphMaker(ts);
maker.setDefaultIsGraphOfAllGraphs(true);
// Create several Graphs and Models
String demoNamespace = "http://ag.franz.com/demo#";
String graphName1 = demoNamespace + "context1";
String graphName2 = demoNamespace + "context2";
Graph graphAll = maker.getGraph(); // default graph represents the graph containing all triples
Graph graphOne = maker.createGraph(graphName1);
Graph graphTwo = maker.createGraph(graphName2);
Graph graphThree = new AllegroGraphReasoner().bind(graphTwo);
Model modelAll = new AllegroGraphModel(graphAll);
Model modelOne = new AllegroGraphModel(graphOne);
Model modelTwo = new AllegroGraphModel(graphTwo);
// Show all graph names
for (Iterator<?> it = maker.listGraphs(); it.hasNext();) {
System.out.println("GraphName: " + it.next());
}
// Load some data
String inputFileName1 = AGPaths.dataSources("vc-db-1.rdf");
String inputFileName2 = AGPaths.dataSources("football.nt");
modelOne.read(inputFileName1, "RDF/XML" );
modelTwo.read(inputFileName2, "N-TRIPLE" );
// A query
String query = "select ?s ?p ?o where {?s ?p ?o }";
// return all triples (or none)
AGJenaUtils.doQuery(query, modelAll);
// retrieve all vcard triples
AGJenaUtils.doQuery(query, modelOne);
// retrieve all football triples (no inference)
AGJenaUtils.doQuery(query, modelTwo);
// retrieve all football triples with inference
AGJenaUtils.doQuery(query, graphThree);
// Close the store and disconnect from the server
ts.closeTripleStore();
ags.disable();
}
}
`

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