001/*
002 * Licensed to DuraSpace under one or more contributor license agreements.
003 * See the NOTICE file distributed with this work for additional information
004 * regarding copyright ownership.
005 *
006 * DuraSpace licenses this file to you under the Apache License,
007 * Version 2.0 (the "License"); you may not use this file except in
008 * compliance with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.fcrepo.jena;
019
020import org.apache.jena.atlas.io.IndentedWriter;
021import org.apache.jena.graph.Graph;
022import org.apache.jena.riot.system.PrefixMap;
023import org.apache.jena.riot.writer.TurtleWriter;
024import org.apache.jena.sparql.util.Context;
025
026/**
027 * @author awoods
028 * @since 2017/01/03
029 */
030public class FedoraTurtleWriter extends TurtleWriter {
031
032    @Override
033    protected void output(final IndentedWriter iOut,
034                          final Graph graph,
035                          final PrefixMap prefixMap,
036                          final String baseURI,
037                          final Context context) {
038        final FedoraTurtleWriter.TurtleWriter$ w =
039                new FedoraTurtleWriter.TurtleWriter$(iOut, prefixMap, baseURI, context) ;
040        w.write(graph) ;
041    }
042
043    private static class TurtleWriter$ extends CopyOfTurtleShell {
044
045        /**
046         *
047         * @param out
048         * @param prefixMap
049         * @param baseURI
050         * @param context
051         */
052        public TurtleWriter$(final IndentedWriter out,
053                             final PrefixMap prefixMap,
054                             final String baseURI,
055                             final Context context) {
056            super(out, prefixMap, baseURI, context) ;
057        }
058
059        private void write(final Graph graph) {
060            writeBase(baseURI) ;
061            writePrefixes(prefixMap) ;
062            if ( !prefixMap.isEmpty() && !graph.isEmpty() ) {
063                out.println();
064            }
065            writeGraphTTL(graph) ;
066        }
067    }
068
069}