/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 18, 2009
*/
package com.bigdata.samples;
import java.util.HashSet;
import java.util.Properties;
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.query.QueryLanguage;
import org.openrdf.query.TupleQuery;
import org.openrdf.query.TupleQueryResult;
import org.openrdf.query.impl.DatasetImpl;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.RepositoryResult;
import com.bigdata.rdf.sail.BigdataSail;
import com.bigdata.rdf.sail.BigdataSailRepository;
/**
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class TestNamedGraphs extends SampleCode {
/**
* Load all data from some directory.
*
* @param dir
*
* @throws Exception
*/
public void test() throws Exception {
final Properties properties = loadProperties("quads.properties");
BigdataSail sail = new BigdataSail(properties);
BigdataSailRepository repo = new BigdataSailRepository(sail);
repo.initialize();
try {
// final RepositoryConnection cxn = repo.getConnection();
final RepositoryConnection cxn = repo.getReadOnlyConnection();
// fast range count!
long stmtCount = sail.getDatabase().getStatementCount();
System.err.println("Statement Count: " + stmtCount);
RepositoryResult<Resource> graphs = cxn.getContextIDs();
HashSet<URI> ngs = new HashSet<URI>();
while (graphs.hasNext()) {
Resource g = graphs.next();
if (g instanceof URI) {
ngs.add((URI) g);
}
}
System.err.println("graphCount: " + ngs.size());
TupleQuery actorQuery = cxn
.prepareTupleQuery(
QueryLanguage.SPARQL,
"SELECT "
+ "DISTINCT"
+ " ?actID ?actor WHERE {"
+ " ?movie a <http://cambridgesemantics.com/ontologies/2009/08/Film#Movie>. "
+ " ?movie <http://cambridgesemantics.com/ontologies/2009/08/Film#performance> ?actID ."
+ " ?actID <http://cambridgesemantics.com/ontologies/2009/08/Film#mpName> ?actor ."
+ " ?actID a <http://cambridgesemantics.com/ontologies/2009/08/Film#Actor>"
+ "}");
DatasetImpl ds = new DatasetImpl();
for (URI g : ngs) {
ds.addDefaultGraph(g);
}
actorQuery.setDataset(ds);
actorQuery.setIncludeInferred(false /* includeInferred */);
long start = System.currentTimeMillis();
TupleQueryResult rs2 = actorQuery.evaluate();
int size = 0;
while (rs2.hasNext()) {
rs2.next();
size++;
if (size % 100 == 0) {
System.err.println(size);
}
}
System.err.println("Query time/size:"
+ (System.currentTimeMillis() - start) + "/" + size);
cxn.close();
} finally {
sail.shutDown();
}
}
/**
* Loads a bunch of data from a zip file.
*
* @param args
* The file name.
*
* @throws Exception
*/
public static void main(String[] args) {
try {
new TestNamedGraphs().test();
} catch (Exception ex) {
ex.printStackTrace(System.err);
}
}
}