Mercurial > repos > mikel-egana-aranguren > sparql_galaxy

annotate src/es/cbgp/galaxy/sparql/jena/SPARQLQueryEngine.java @ 0:137f9a4a6337 draft

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First version to init the repo, still README etc to add but it works
author mikel-egana-aranguren
date Thu, 25 Oct 2012 12:17:40 -0400
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children b8bf1af83841
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137f9a4a6337 First version to init the repo, still README etc to add but it works
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1 package es.cbgp.galaxy.sparql.jena;
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2
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3 import java.io.BufferedReader;
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4 import java.io.FileReader;
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5 import java.util.Iterator;
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6
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7 import com.hp.hpl.jena.ontology.OntModel;
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8 import com.hp.hpl.jena.query.*;
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9 import com.hp.hpl.jena.shared.Lock;
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10
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11 public class SPARQLQueryEngine {
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12
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13 private OntModel queryModel;
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14 private String sparqlFile;
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15
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16 public SPARQLQueryEngine(OntModel om) {
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17 this.queryModel = om;
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18 }
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19
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20 public String executeQuery() throws Exception {
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21 String finalQuery = loadQueryFromFile();
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22 // System.out.println("Final query: " + finalQuery);
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23 Query query = null;
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24 QueryExecution qexec = null;
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25 try {
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26 queryModel.enterCriticalSection(Lock.READ);
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27 query = QueryFactory.create(finalQuery);
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28 qexec = QueryExecutionFactory.create(query, queryModel);
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29 ResultSet results = qexec.execSelect();
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30 String res = "";
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31 while (results.hasNext()) {
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32 QuerySolution qs = results.next();
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33 Iterator<String> vars = qs.varNames();
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34 while (vars.hasNext()) {
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35 String var = vars.next();
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36 if (!qs.getResource(var).isAnon()) {
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37 res += "?" + var + "\t" + qs.getResource(var) + "\n";
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38 }
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39 }
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40 }
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41 return res;
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42 } catch (Exception e) {
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43 e.printStackTrace();
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44 } finally {
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45 queryModel.leaveCriticalSection();
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46 if (qexec != null) {
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47 qexec.close();
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48 }
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49 }
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50 return null;
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51 }
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52
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53 private String loadQueryFromFile() throws Exception {
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54 String query = "";
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55 BufferedReader bL = new BufferedReader(new FileReader(this.sparqlFile));
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56 while (bL.ready()) {
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57 query += bL.readLine();
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58 }
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59 bL.close();
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60 return query;
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61 }
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62
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63 public void setQueryFile(String sparqlFile) {
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64 this.sparqlFile = sparqlFile;
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65 }
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66 }