/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sdb.store;
//import java.lang.String.format
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.sdb.shared.SDBInternalError;
import com.hp.hpl.jena.sdb.shared.SDBNotImplemented;
/** Adapter from a tuple loader to a graph loader.*/
public class TupleGraphLoader implements StoreLoader
{
private TupleLoader loader ;
/** The loader must be for a triple table of some kind */
public TupleGraphLoader(TupleLoader loader)
{
if ( loader.getTableDesc() == null )
throw new SDBInternalError("No table description for loader") ;
if ( loader.getTableDesc().getWidth() != 3 )
{
String x = String.format("Table description width is %d, not 3",
loader.getTableDesc().getWidth()) ;
throw new SDBInternalError(x) ;
}
this.loader = loader ;
}
@Override
public void addTriple(Triple triple)
{ loader.load(row(triple)) ; }
@Override
public void deleteTriple(Triple triple)
{ loader.unload(row(triple)) ; }
private static Node[] row(Triple triple)
{
Node[] nodes = new Node[3] ;
nodes[0] = triple.getSubject() ;
nodes[1] = triple.getPredicate() ;
nodes[2] = triple.getObject() ;
return nodes ;
}
@Override
public void close()
{ loader.finish() ; }
@Override
public void startBulkUpdate()
{ loader.start() ; }
@Override
public void finishBulkUpdate()
{ loader.finish() ; }
@Override
public int getChunkSize()
{ throw new SDBNotImplemented("TupleGraphLoader.getChunkSize") ; }
@Override
public void setChunkSize(int chunks)
{ throw new SDBNotImplemented("TupleGraphLoader.setChunkSize") ; }
@Override
public boolean getUseThreading()
{ throw new SDBNotImplemented("TupleGraphLoader.getUseThreading") ; }
@Override
public void setUseThreading(boolean useThreading)
{ throw new SDBNotImplemented("TupleGraphLoader.setUseThreading") ; }
@Override
public void deleteAll()
{ throw new SDBNotImplemented("TupleGraphLoader.deleteAll"); }
}