jena-arq/src-examples/arq/examples/riot/ExRIOT_5.java

/*
 * 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 arq.examples.riot;

import java.io.InputStream ;
import java.util.Iterator ;

import org.apache.jena.atlas.web.ContentType ;
import org.apache.jena.riot.* ;
import org.apache.jena.riot.system.StreamRDF ;

import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.sparql.sse.Item ;
import com.hp.hpl.jena.sparql.sse.SSE ;
import com.hp.hpl.jena.sparql.sse.builders.BuilderGraph ;
import com.hp.hpl.jena.sparql.util.Context ;

/** Example of using RIOT : register a new language */ 
public class ExRIOT_5
{
    public static void main(String...argv)
    {
        Lang lang = LangBuilder.create("SSE", "text/x-sse").addFileExtensions("rsse").build() ;
        // This just registers the name, not the parser.
        RDFLanguages.register(lang) ;
        
        // Register the parser factory.
        ReaderRIOTFactory factory = new Factory() ;
        RDFParserRegistry.registerLangTriples(lang, factory) ;
        
        String filename = "data.rsse" ;
        Model model = RDFDataMgr.loadModel(filename) ;
        model.write(System.out, "TTL") ;
    }
    
    static class Factory implements ReaderRIOTFactory
    {
        @Override
        public ReaderRIOT create(Lang language)
        {
            return new ReaderRIOT() {
                @Override
                public void read(InputStream in, String baseURI, ContentType ct, StreamRDF output, Context context)
                {
                    // This is just an example - it reads a graph in 
                    // http://jena.apache.org/documentation/notes/sse.html
                    // format.  It is not a streaming parser; it creates some triples,
                    // then send them to the output. This style might be useful for creating
                    // triples from a converter process or program. 
                    Item item = SSE.parse(in) ;
                    Graph graph = BuilderGraph.buildGraph(item) ;
                    Iterator<Triple> iter = graph.find(null, null, null) ;
                    for ( ; iter.hasNext() ; )
                        output.triple(iter.next()) ;
                }} ;
        }
    }
    
    /* data.rsse :
     * (graph
     *   (<s> <p1> 123)
     *   (<s> <p2> 456) )
     */
}