unibremen/informatik/RDFReasoner.java

import java.io.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.sparql.*;
import com.hp.hpl.jena.update.*;
import java.io.File;
import java.io.BufferedReader;
import java.io.IOException;

public class RDFReasoner {
    public static void main (String args[]) throws Exception {
        String current = null;

        if (args.length == 0) {
            System.out.println("<rdf_filename> <query_filename>");
            System.exit(1);
        } else {
            String inputFile = args[0];
            InputStream in = new FileInputStream(inputFile);
            Model model = ModelFactory.createDefaultModel();

            if (in == null) {
                System.out.println("File" + inputFile + "not found");
                System.exit(1);
            } else
                current = "file://" + new File(inputFile).getAbsolutePath();

            if (args.length == 1) {
                try {
                    model.read(current);
                    model.write(System.out);
                } catch(Exception e) {
                    System.out.println(e.getMessage());
                    System.exit(1);
                }
            } else {
                String inputQuery = null;
                String queryString = "";
                try {
                    inputQuery = args[1];
                    BufferedReader query_in = new BufferedReader(new FileReader(inputQuery));
                    String line;

                    while ((line = query_in.readLine()) != null)
                        queryString += line + "\n";

                    model.read(current);
                    Query query = QueryFactory.create(queryString);

                    //Execute query and obtain results
                    QueryExecution qe = QueryExecutionFactory.create(query, model);
                    ResultSet results = qe.execSelect();

                    // Output query results
                    ResultSetFormatter.out(System.out, results, query);

                    // Important - free up resources used running the query
                    qe.close();

                    //model.write(System.out);
                } catch(Exception e) {
                    System.out.println(e.getMessage());
                    System.exit(1);
                }
            }
        }
    }
}