/*
 * 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.hadoop.rdf.io.output.writers;

import java.io.Writer;

import org.apache.jena.graph.Node ;
import org.apache.jena.hadoop.rdf.types.QuadWritable;
import org.apache.jena.riot.out.NodeFormatter;
import org.apache.jena.riot.out.NodeFormatterNT;
import org.apache.jena.sparql.core.Quad ;

/**
 * An abstract writer for line based quad formats
 * 
 * 
 * @param <TKey>
 * 
 */
public abstract class AbstractLineBasedQuadWriter<TKey> extends AbstractLineBasedNodeTupleWriter<TKey, Quad, QuadWritable> {

    /**
     * Creates a new writer using the default NTriples node formatter
     * 
     * @param writer
     *            Writer
     */
    public AbstractLineBasedQuadWriter(Writer writer) {
        this(writer, new NodeFormatterNT());
    }

    /**
     * Creates a new writer using the specified node formatter
     * 
     * @param writer
     *            Writer
     * @param formatter
     *            Node formatter
     */
    public AbstractLineBasedQuadWriter(Writer writer, NodeFormatter formatter) {
        super(writer, formatter);
    }

    @Override
    protected Node[] getNodes(QuadWritable tuple) {
        Quad q = tuple.get();
        if (q.isDefaultGraph()) {
            return new Node[] { q.getSubject(), q.getPredicate(), q.getObject() };
        } else {
            return new Node[] { q.getSubject(), q.getPredicate(), q.getObject(), q.getGraph() };
        }
    }

}