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/***********************************************************************************************************************
 *
 * blueBill Core - open source birding
 * Copyright (C) 2009-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * Licensed 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.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://bluebill.tidalwave.it
 * SCM: https://kenai.com/hg/bluebill~core-src
 *
 **********************************************************************************************************************/
package it.tidalwave.bluebill.taxonomy.elmo.impl;

import java.io.OutputStream;
import javax.annotation.Nonnull;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.File;
import java.io.Writer;
import java.io.OutputStreamWriter;
import it.tidalwave.util.logging.Logger;
import it.tidalwave.bluebill.taxonomy.io.Exporter;
import java.io.FilterOutputStream;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.rio.RDFHandlerException;
import org.openrdf.rio.RDFWriter;
import org.openrdf.rio.n3.N3Writer;
import org.openrdf.rio.rdfxml.util.OrganizedRDFXMLWriter;
import static it.tidalwave.bluebill.taxonomy.elmo.ElmoTaxonomyVocabulary.*;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 **********************************************************************************************************************/
public class ElmoExporter implements Exporter
  {
    private static final String CLASS = ElmoExporter.class.getName();
    private static final Logger logger = Logger.getLogger(CLASS);

    @Nonnull
    private final Repository repository;

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    public ElmoExporter (final @Nonnull Repository repository)
      {
        this.repository = repository;
      }

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    public void export (final @Nonnull File file)
      throws IOException
      {
        logger.info("Exporting repository to %s", file);
        final String fileName = file.getName().toLowerCase();
        export(new FileOutputStream(file), fileName);
      }

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    public void export (@Nonnull OutputStream os, final @Nonnull String fileName)
      throws IOException
      {
        os = new FilterOutputStream(os)
          {
            @Override
            public void close() throws IOException
              {
                flush();
              }
          };

        try
          {
            final RepositoryConnection connection = repository.getConnection();

            final Writer w1 = new OutputStreamWriter(os, "UTF-8");

            if (fileName.endsWith(".rdf"))
              {
                final OrganizedRDFXMLWriter rdfWriter = new OrganizedRDFXMLWriter(w1);
                setupNamespaces(rdfWriter);
                connection.export(rdfWriter);
                rdfWriter.close();
              }

            else if (fileName.endsWith(".n3"))
              {
                final N3Writer n3Writer = new N3Writer(w1);
                setupNamespaces(n3Writer);
                connection.export(n3Writer);
                w1.close();
              }

            connection.close();
          }
        catch (RDFHandlerException e)
          {
            throw new IOException(e.toString()); // Java 5/Android compatibility
          }
        catch (RepositoryException e)
          {
            throw new IOException(e.toString()); // Java 5/Android compatibility
          }
       }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    private void setupNamespaces (final @Nonnull RDFWriter rdfWriter)
      throws RDFHandlerException
      {
        rdfWriter.handleNamespace("rdfs",    "http://www.w3.org/2000/01/rdf-schema#");
        rdfWriter.handleNamespace("foaf",    "http://xmlns.com/foaf/0.1/");
        rdfWriter.handleNamespace("dcmi",    "http://purl.org/dc/dcmitype/");
        rdfWriter.handleNamespace("dc",      "http://purl.org/dc/elements/1.1/");
        rdfWriter.handleNamespace("dcterms", "http://purl.org/dc/terms/");
        rdfWriter.handleNamespace("dwc",     NS_DARWIN_CORE);
        rdfWriter.handleNamespace("owl",     "http://www.w3.org/2002/07/owl#");
        rdfWriter.handleNamespace("skos",    "http://www.w3.org/2004/02/skos/core#");
        rdfWriter.handleNamespace("txn",     "http://rdf.geospecies.org/ont/txn.owl#");
        rdfWriter.handleNamespace("taxo",    NS_TAXO_BASE);
      }
  }