Examples of com.hp.hpl.jena.query.Query

com.hp.hpl.jena.query.Query
The data structure for a query as presented externally. There are two ways of creating a query - use the parser to turn a string description of the query into the executable form, and the programmatic way (the parser is calling the programmatic operations driven by the quyery string). The declarative approach of passing in a string is preferred. Once a query is built, it can be passed to the QueryFactory to produce a query execution engine. @see QueryExecutionFactory @see ResultSet

  @Override
  public ClosableIterable<Statement> queryConstruct(String query,
      String querylanguage) throws QueryLanguageNotSupportedException,
      MalformedQueryException, ModelRuntimeException {


    Query jenaQuery = QueryFactory.create(query);
    QueryExecution qexec = QueryExecutionFactory.create(jenaQuery,
        this.dataset);


    if (jenaQuery.isConstructType()) {
      com.hp.hpl.jena.rdf.model.Model m = qexec.execConstruct();
      Model resultModel = new ModelImplJena(null, m, Reasoning.none);
      resultModel.open();
      return resultModel;
    } else {

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    if (syntax == null) {
      // delegate to super
      throw new QueryLanguageNotSupportedException(
          "Unsupported query language: " + querylanguage);
    }
    Query jenaQuery = QueryFactory.create(query, syntax);
    return new QueryResultTableImpl(jenaQuery,
        this.dataset);
  }

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  }


  @Override
  public ClosableIterable<Statement> sparqlConstruct(String query)
      throws ModelRuntimeException, MalformedQueryException {
    Query jenaQuery = QueryFactory.create(query);
    QueryExecution qexec = QueryExecutionFactory.create(jenaQuery,
        this.dataset);


    if (jenaQuery.isConstructType()) {
      com.hp.hpl.jena.rdf.model.Model m = qexec.execConstruct();
      Model resultModel = new ModelImplJena(null, m, Reasoning.none);
      resultModel.open();
      return resultModel;
    } else {

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  }


  @Override
  public ClosableIterable<Statement> sparqlDescribe(String query)
      throws ModelRuntimeException {
    Query jenaQuery = QueryFactory.create(query);
    QueryExecution qexec = QueryExecutionFactory.create(jenaQuery,
        this.dataset);


    if (jenaQuery.isDescribeType()) {
      com.hp.hpl.jena.rdf.model.Model m = qexec.execDescribe();
      Model resultModel = new ModelImplJena(null, m, Reasoning.none);
      resultModel.open();
      return resultModel;
    } else {

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  }


  @Override
  public QueryResultTable sparqlSelect(String queryString)
      throws MalformedQueryException, ModelRuntimeException {
    Query jenaQuery = QueryFactory.create(queryString);
    return new QueryResultTableImpl(jenaQuery,
        this.dataset);
  }

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  }


  @Override
  public boolean sparqlAsk(String query) throws ModelRuntimeException,
      MalformedQueryException {
    Query jenaQuery = QueryFactory.create(query);
    QueryExecution qexec = QueryExecutionFactory.create(jenaQuery,
        this.dataset);


    if (jenaQuery.isAskType()) {
      return qexec.execAsk();
    } else {
      throw new RuntimeException(
          "Cannot handle this type of query! Please use ASK.");
    }

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      "WHERE {" +
      "      ?person a foaf:Person . " +
      "      ?person ?property ?object . " +
      "      }";


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

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//    protected UpdateSink getUpdateSink() { return sink ; }
    public void setUpdateSink(UpdateSink sink)
    { 
        this.sink = sink ;
        this.query = new Query() ; 
        setPrologue(sink.getPrologue()) ;
    }

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        query = newSubQuery(getPrologue()) ;
    }
    
    protected Query newSubQuery(Prologue progloue)
    {
        return new Query(getPrologue());
    }

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        query = stack.pop();
    }
    
    protected Query endSubSelect(int line, int column)
    {
        Query subQuery = query ;
        if ( ! subQuery.isSelectType() )
            throwParseException("Subquery not a SELECT query", line, column) ;
        popQuery();
        return subQuery ;
    }

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