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AGJenaUtils.java

package com.franz.agjena.examples;





import com.franz.agjena.exceptions.NiceException;

import com.franz.agjena.query.AllegroGraphQuery;

import com.franz.agjena.query.AllegroGraphQueryExecutionFactory;

import com.franz.agjena.query.AllegroGraphQueryFactory;

import com.hp.hpl.jena.graph.Graph;

import com.hp.hpl.jena.query.QueryExecution;

import com.hp.hpl.jena.query.ResultSetFactory;

import com.hp.hpl.jena.query.ResultSetFormatter;

import com.hp.hpl.jena.rdf.model.Model;

import com.hp.hpl.jena.rdf.model.Statement;

import com.hp.hpl.jena.rdf.model.StmtIterator;

import com.hp.hpl.jena.rdf.model.impl.ModelCom;

import com.hp.hpl.jena.sparql.core.DatasetImpl;

import com.hp.hpl.jena.sparql.resultset.ResultSetRewindable;



public class AGJenaUtils {

    

    /**

     * Execute 'sparqlQuery' against 'model' and print a tabular result.

     */

    public static void doQuery (String sparqlQuery, Model model) {

        AllegroGraphQuery query = AllegroGraphQueryFactory.create(sparqlQuery) ;

        System.out.println("Query: " + sparqlQuery);

        QueryExecution qe = AllegroGraphQueryExecutionFactory.create(query, model) ;

        ResultSetRewindable rs = ResultSetFactory.makeRewindable(qe.execSelect()) ;

        ResultSetFormatter.out(rs) ;

        qe.close() ; 

    }

    

    /**

     * Execute 'sparqlQuery' against 'graph' and print a tabular result.

     */

    public static void doQuery (String sparqlQuery, Graph graph) {

        AllegroGraphQuery query = AllegroGraphQueryFactory.create(sparqlQuery) ;

        System.out.println("Query: " + sparqlQuery);

        // THERE MUST BE A BETTER WAY TO DEFINE THE DATASET

        QueryExecution qe = AllegroGraphQueryExecutionFactory.create(query, new DatasetImpl(new ModelCom(graph))) ;

        ResultSetRewindable rs = ResultSetFactory.makeRewindable(qe.execSelect()) ;

        ResultSetFormatter.out(rs) ;

        qe.close() ; 

    }



    /**

     * Print all statements in 'model' showing also the model's graph.

     */

    public static void printModel (Model model) {

        try {

            StmtIterator it = model.listStatements();

            while (it.hasNext()) {

                Statement st = (Statement)it.next();

                System.out.println(st.toString() + " in " + model.getGraph().toString());

            }

        } catch (Exception ex) {throw new NiceException(ex);}

    }

    

}
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