/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 2008-2009.
*
* Licensed under the Aduna BSD-style license.
*/
package org.openrdf.http.server.resources;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.restlet.data.Form;
import org.restlet.representation.Representation;
import org.restlet.representation.Variant;
import org.restlet.resource.ResourceException;
import org.openrdf.http.protocol.Protocol;
import org.openrdf.http.server.helpers.ServerUtil;
import org.openrdf.http.server.resources.helpers.TupleResultResource;
import org.openrdf.model.BNode;
import org.openrdf.model.ValueFactory;
import org.openrdf.query.BindingSet;
import org.openrdf.query.impl.ListBindingSet;
import org.openrdf.result.TupleResult;
import org.openrdf.result.impl.TupleResultImpl;
/**
* @author Arjohn Kampman
*/
public class BNodesResource extends TupleResultResource {
@Override
protected Representation post(Representation representation, Variant variant)
throws ResourceException
{
return get(variant);
}
@Override
public TupleResult getTupleResult()
throws ResourceException
{
Form params = getQuery();
int amount = ServerUtil.parseIntegerParam(params, Protocol.AMOUNT, 1);
String nodeID = params.getFirstValue(Protocol.NODE_ID);
ValueFactory vf = getConnection().getValueFactory();
List<String> columns = Arrays.asList(Protocol.BNODE);
List<BindingSet> bnodes = new ArrayList<BindingSet>(amount);
for (int i = 0; i < amount; i++) {
BNode bnode = createBNode(vf, nodeID, i);
bnodes.add(new ListBindingSet(columns, bnode));
}
return new TupleResultImpl(columns, bnodes);
}
private BNode createBNode(ValueFactory vf, String nodeID, int i) {
if (i == 0 && nodeID != null) {
return vf.createBNode(nodeID);
}
return vf.createBNode();
}
@Override
protected String getFilenamePrefix() {
return "bnodes";
}
}