/*

  * 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.any23.extractor.rdf;

 import org.apache.any23.extractor.ExtractionResult;

 import org.openrdf.model.Resource;

 import org.openrdf.model.Statement;

 import org.openrdf.model.URI;

 import org.openrdf.rio.RDFHandler;

 import org.openrdf.rio.RDFHandlerException;

 /**

  * An RDFHandler that relays statements and prefix definitions to

  * an {@link ExtractionResult}. Used to feed output from Sesame's

  * RDF parsers into Any23.

  *

  * @author Richard Cyganiak (richard@cyganiak.de)

  */

 public class RDFHandlerAdapter implements RDFHandler {

     private ExtractionResult target;

     public RDFHandlerAdapter(ExtractionResult target) {

         this.target = target;

     }

     public void startRDF() throws RDFHandlerException {

     }

     public void handleNamespace(String prefix, String uri) {

         target.writeNamespace(prefix, uri);

     }

     public void handleStatement(Statement stmt) {

         if(stmt != null) {

             final Resource context = stmt.getContext();

             if(context instanceof URI) {

                 target.writeTriple(stmt.getSubject(), stmt.getPredicate(), stmt.getObject(), (URI) context);

             } else {

                 target.writeTriple(stmt.getSubject(), stmt.getPredicate(), stmt.getObject());

             }

         }

     }

     public void handleComment(String comment) {

         // Empty.

     }

     public void endRDF() throws RDFHandlerException {

         // Empty.

     }

 }