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Graph I/O library which can be used to load and store graphs
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/* 
 *  Copyright or © or Copr. Ecole des Mines d'Alès (2012-2014) 
 *  
 *  This software is a computer program whose purpose is to provide 
 *  several functionalities for the processing of semantic data 
 *  sources such as ontologies or text corpora.
 *  
 *  This software is governed by the CeCILL  license under French law and
 *  abiding by the rules of distribution of free software.  You can  use, 
 *  modify and/ or redistribute the software under the terms of the CeCILL
 *  license as circulated by CEA, CNRS and INRIA at the following URL
 *  "http://www.cecill.info". 
 * 
 *  As a counterpart to the access to the source code and  rights to copy,
 *  modify and redistribute granted by the license, users are provided only
 *  with a limited warranty  and the software's author,  the holder of the
 *  economic rights,  and the successive licensors  have only  limited
 *  liability. 

 *  In this respect, the user's attention is drawn to the risks associated
 *  with loading,  using,  modifying and/or developing or reproducing the
 *  software by the user in light of its specific status of free software,
 *  that may mean  that it is complicated to manipulate,  and  that  also
 *  therefore means  that it is reserved for developers  and  experienced
 *  professionals having in-depth computer knowledge. Users are therefore
 *  encouraged to load and test the software's suitability as regards their
 *  requirements in conditions enabling the security of their systems and/or 
 *  data to be ensured and,  more generally, to use and operate it in the 
 *  same conditions as regards security. 
 * 
 *  The fact that you are presently reading this means that you have had
 *  knowledge of the CeCILL license and that you accept its terms.
 */
package slib.graph.io.loader.rdf;

import org.openrdf.model.Statement;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.rio.RDFHandler;
import org.openrdf.rio.RDFHandlerException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import slib.graph.model.graph.G;
import slib.graph.model.impl.repo.URIFactoryMemory;
import slib.graph.model.repo.URIFactory;

/**
 *
 * @author Sébastien Harispe 
 */
public class SlibRdfHandler implements RDFHandler {

    G g;
    Logger logger = LoggerFactory.getLogger(this.getClass());
    int count = 0;
    int countSkipped = 0;
    URIFactory factory;

    /**
     *
     * @param g
     */
    public SlibRdfHandler(G g) {
        this.g = g;
        factory = URIFactoryMemory.getSingleton();
    }

    @Override
    public void startRDF() throws RDFHandlerException {

        logger.info("Start Process");
        count = 0;
    }

    @Override
    public void endRDF() throws RDFHandlerException {

        logger.info("Ending Process " + count + " statements loaded ");
        logger.info("vertices: " + g.getV().size());
        logger.info("edges   : " + g.getE().size());
        logger.info("Skipped (statement involving non URI ressources) : " + countSkipped);
    }

    @Override
    // TODO
    public void handleNamespace(String prefix, String uri) throws RDFHandlerException {
    }

    @Override
    public void handleStatement(Statement st) throws RDFHandlerException {
        
        Value s = st.getSubject();
        Value o = st.getObject();
        
//        logger.debug(st.toString());
        

        if (s instanceof URI && o instanceof URI) {
            g.addE((URI) s,st.getPredicate(),(URI) o);
            count++;
        }
        else{
            countSkipped++;
        }
        if(count % 100000 == 0){
            logger.info(count+" statements already loaded");
            logger.info("Number of vertices: "+g.getV().size());
            logger.info("Number of edges   : "+g.getE().size());
        }
    }

    @Override
    public void handleComment(String comment) throws RDFHandlerException {}
}