/*
* 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.out;
import java.io.OutputStream ;
import org.apache.jena.atlas.io.AWriter ;
import org.apache.jena.atlas.io.IO ;
import org.apache.jena.atlas.lib.Sink ;
import org.apache.jena.graph.Node ;
import org.apache.jena.riot.RDFDataMgr ;
import org.apache.jena.riot.system.Prologue ;
import org.apache.jena.riot.writer.WriterStreamRDFPlain ;
import org.apache.jena.sparql.core.Quad ;
/** A class that print quads, N-Quads style *
* @see WriterStreamRDFPlain
* @see RDFDataMgr#writeTriples
*/
public class SinkQuadOutput implements Sink<Quad>
{
private Prologue prologue = null ;
private AWriter out ;
private NodeToLabel labelPolicy = null ;
private NodeFormatter nodeFmt = new NodeFormatterNT() ;
public SinkQuadOutput(OutputStream outs, Prologue prologue, NodeToLabel labels)
{
out = IO.wrapUTF8(outs) ;
setPrologue(prologue) ;
setLabelPolicy(labels) ;
}
// Need to do this later sometimes to sort out the plumbing.
public void setPrologue(Prologue prologue)
{
this.prologue = prologue ;
}
public void setLabelPolicy(NodeToLabel labels)
{
this.labelPolicy = labels ;
}
@Override
public void send(Quad quad)
{
Node s = quad.getSubject() ;
Node p = quad.getPredicate() ;
Node o = quad.getObject() ;
Node g = quad.getGraph() ;
nodeFmt.format(out, s) ;
out.print(" ") ;
nodeFmt.format(out, p) ;
out.print(" ") ;
nodeFmt.format(out, o) ;
if ( outputGraphSlot(g) )
{
out.print(" ") ;
nodeFmt.format(out, g) ;
}
out.print(" .\n") ;
}
private static boolean outputGraphSlot(Node g)
{
return ( g != null && g != Quad.tripleInQuad && ! Quad.isDefaultGraph(g) ) ;
}
@Override
public void flush()
{
IO.flush(out) ;
}
@Override
public void close()
{
IO.flush(out) ;
// Don't close the underlying OutputStream that was passed in.
}
}