at.newmedialab.ldpath.backend.file.FileBackend Maven / Gradle / Ivy

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package at.newmedialab.ldpath.backend.file;

import at.newmedialab.ldpath.backend.sesame.GenericSesameBackend;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.sail.SailRepository;
import org.openrdf.rio.RDFFormat;
import org.openrdf.rio.RDFParseException;
import org.openrdf.sail.memory.MemoryStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.net.URL;

/**
 * Add file description here!
 * 
 * Author: Sebastian Schaffert
 */
public class FileBackend extends GenericSesameBackend {

    private static final Logger log = LoggerFactory.getLogger(FileBackend.class);


    public FileBackend(File file) {
        this(file,null);
    }

    public FileBackend(File file, String mimetype) {
        super();

        RDFFormat format = null;

        if(mimetype != null) {
            format = RDFFormat.forMIMEType(mimetype);
        }

        try {
            Repository repository = new SailRepository(new MemoryStore());
            repository.initialize();
            setRepository(repository);


            RepositoryConnection connection = repository.getConnection();
            try {
                connection.add(file,null,format);
            } finally {
                connection.close();
            }


        } catch (RDFParseException e) {
            log.error("error parsing RDF input data from file {}",file,e);
        } catch (IOException e) {
            log.error("I/O error while reading input data from file {}", file, e);
        } catch (RepositoryException e) {
            log.error("error initialising connection to Sesame in-memory repository",e);
        }
    }


    /**
     * Initialise a new sesame backend. Repository needs to be set using setRepository.
     */
    public FileBackend(String fileName) {
        this(new File(fileName));
    }

    public FileBackend(String fileName, String mimetype) {
        this(new File(fileName), mimetype);
    }


    public FileBackend(URL url) {
        this(url,null);
    }

    public FileBackend(URL url, String mimetype) {
        super();

        RDFFormat format = null;

        if(mimetype != null) {
            format = RDFFormat.forMIMEType(mimetype);
        }

        try {
            Repository repository = new SailRepository(new MemoryStore());
            repository.initialize();
            setRepository(repository);


            RepositoryConnection connection = repository.getConnection();
            try {
                connection.add(url,null,format);
            } finally {
                connection.close();
            }


        } catch (RDFParseException e) {
            log.error("error parsing RDF input data from url {}",url,e);
        } catch (IOException e) {
            log.error("I/O error while reading input data from url {}", url, e);
        } catch (RepositoryException e) {
            log.error("error initialising connection to Sesame in-memory repository",e);
        }
    }

}