/**
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
*/
package com.bigdata.rdf.sail.webapp;
import java.io.StringWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.openrdf.model.Resource;
import org.openrdf.repository.RepositoryResult;
import com.bigdata.rdf.sail.BigdataSailRepositoryConnection;
import com.bigdata.rdf.sail.webapp.XMLBuilder.Node;
/**
* Task to report the contexts used by a QUADS mode KB instance.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
class RestApiGetContextsTask extends AbstractRestApiTask<Void> {
public RestApiGetContextsTask(final HttpServletRequest req,
final HttpServletResponse resp, final String namespace,
final long timestamp) {
super(req, resp, namespace, timestamp);
}
@Override
public boolean isReadOnly() {
return true;
}
@Override
public Void call() throws Exception {
BigdataSailRepositoryConnection conn = null;
try {
conn = getQueryConnection();
final StringWriter w = new StringWriter();
final RepositoryResult<Resource> it = conn.getContextIDs();
try {
final XMLBuilder t = new XMLBuilder(w);
final Node root = t.root("contexts");
while (it.hasNext()) {
root.node("context").attr("uri", it.next()).close();
}
root.close();
} finally {
it.close();
}
buildResponse(QueryServlet.HTTP_OK, QueryServlet.MIME_APPLICATION_XML,
w.toString());
return null;
} finally {
if (conn != null) {
conn.close();
}
}
}
}