/*
* 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 org.apache.jena.riot.lang;
import org.apache.jena.atlas.event.Event ;
import org.apache.jena.atlas.event.EventListener ;
import org.apache.jena.atlas.event.EventManager ;
import org.apache.jena.atlas.event.EventType ;
import org.apache.jena.atlas.lib.Sink ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.graph.GraphEvents ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.sparql.SystemARQ ;
/**
* Send triples to a graph.
* This Sink must be closed after use.
*/
public class SinkTriplesToGraph implements Sink<Triple>
{
static final EventType startRead = new EventType("SinkToGraph.StartRead") ;
static final EventType finishRead = new EventType("SinkToGraph.FinishRead") ;
protected final Graph graph ;
private EventListener el1 ;
private EventListener el2 ;
public SinkTriplesToGraph(boolean x , Graph g)
{
this.graph = g ;
// Convert between the new global event system (EventManager)
// and old style Jena graph events.
el1 = new EventListener(){
@Override
public void event(Object dest, Event event)
{
graph.getEventManager().notifyEvent( graph , GraphEvents.startRead ) ;
}
} ;
el2 = new EventListener(){
@Override
public void event(Object dest, Event event)
{
graph.getEventManager().notifyEvent( graph , GraphEvents.finishRead ) ;
}
} ;
EventManager.register(this, startRead, el1) ;
EventManager.register(this, finishRead, el2) ;
}
@Override
public void send(Triple triple)
{
graph.add(triple) ;
}
@Override
public void flush() { SystemARQ.sync(graph) ; }
@Override
public void close()
{
EventManager.unregister(this, finishRead, el2) ;
EventManager.unregister(this, startRead, el1) ;
}
}