Mercurial > repos > mikel-egana-aranguren > sparql_galaxy

annotate src/es/cbgp/galaxy/sparql/jena/SPARQLQueryEngine.java @ 2:b8bf1af83841 draft

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Paste query added, query engine improved, examples added
author Mikel Egana Aranguren <mikel-egana-aranguren@toolshed.g2.bx.psu.edu>
date Wed, 04 Dec 2013 08:17:00 +0100
parents 137f9a4a6337
children
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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.query.*;
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8 import com.hp.hpl.jena.rdf.model.Model;
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9 import com.hp.hpl.jena.rdf.model.RDFNode;
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10 import com.hp.hpl.jena.shared.Lock;
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11
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12 public class SPARQLQueryEngine {
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14 private Model queryModel;
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15 private String sparqlFile;
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17 public SPARQLQueryEngine(Model om) {
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18 this.queryModel = om;
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19 }
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20
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21 public String executeQuery() throws Exception {
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22 String finalQuery = loadQueryFromFile();
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23 // System.out.println("Final query: " + finalQuery);
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24 Query query = null;
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25 QueryExecution qexec = null;
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26 try {
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27 queryModel.enterCriticalSection(Lock.READ);
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28 query = QueryFactory.create(finalQuery);
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29 qexec = QueryExecutionFactory.create(query, queryModel);
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30 ResultSet results = qexec.execSelect();
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31 String res = "";
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32 while (results.hasNext()) {
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33 QuerySolution qs = results.next();
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34 Iterator<String> vars = qs.varNames();
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35 while (vars.hasNext()) {
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36 String var = vars.next();
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37 res += "?" + var + "\t" + getValue(qs, var) + "\r\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 getValue(QuerySolution qs, String var) {
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54 RDFNode n = qs.get(var);
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55 return n.toString();
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56
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57 // System.out.println("RDFNode (" + var + "): " + n);
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58 // try {
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59 // if (!qs.getResource(var).isAnon()) {
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60 // if (qs.getResource(var).isResource()) {
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61 // return qs.getResource(var).toString();
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62 // }
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63 // if (qs.getResource(var).isLiteral()) {
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64 // return qs.getLiteral(var).toString();
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65 // }
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66 // }
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67 // } catch (Exception e) {
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68 //
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69 // }
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70 // try {
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71 // if (!qs.getLiteral(var).isAnon()) {
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72 // if (qs.getResource(var).isResource()) {
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73 // return qs.getResource(var).toString();
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74 // }
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75 // if (qs.getResource(var).isLiteral()) {
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76 // return qs.getLiteral(var).toString();
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77 // }
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78 // }
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79 // } catch (Exception e) {
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80 //
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81 // }
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82 // return "Error";
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83 }
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84
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85 private String loadQueryFromFile() throws Exception {
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86 String query = "";
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87 BufferedReader bL = new BufferedReader(new FileReader(this.sparqlFile));
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88 while (bL.ready()) {
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89 query += bL.readLine();
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90 }
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91 bL.close();
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92 return query;
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93 }
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94
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95 public void setQueryFile(String sparqlFile) {
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96 this.sparqlFile = sparqlFile;
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97 }
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98 }