org.openrdf.query.Query Java Examples
The following examples show how to use
org.openrdf.query.Query.
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Example #1
Source File: QueryRewriter.java From neo4j-sparql-extension with GNU General Public License v3.0 | 6 votes |
/** * Rewrite a given query to add inference. * * @param ql the query language used for the query * @param query the query to rewrite * @param baseuri a base URI to use for the query * @return rewritten query that includes inference * @throws MalformedQueryException if the query is malformed * @throws RepositoryException if there was a problem while rewriting */ public Query rewrite(QueryLanguage ql, String query, String baseuri) throws MalformedQueryException, RepositoryException { // parse query using Sesame QueryParserFactory f = QueryParserRegistry.getInstance().get(ql); QueryParser parser = f.getParser(); ParsedQuery parsed = parser.parseQuery(query, baseuri); // get SPARQL algebra expression from parsed query TupleExpr expr = parsed.getTupleExpr(); // rewrite query using visitor pattern RuleTransformationVisitor visitor = new RuleTransformationVisitor(rules); expr.visit(visitor); // return new query based on rewritten algebra expression return getExprQuery(parsed, expr); }
Example #2
Source File: QueryEvaluation.java From CostFed with GNU Affero General Public License v3.0 | 5 votes |
public List<List<Object>> evaluate(String queries) throws Exception { List<List<Object>> report = new ArrayList<List<Object>>(); List<String> qnames = Arrays.asList(queries.split(" ")); for (String curQueryName : qnames) { List<Object> reportRow = new ArrayList<Object>(); report.add(reportRow); String curQuery = qp.getQuery(curQueryName); reportRow.add(curQueryName); long startTime = System.currentTimeMillis(); //ParsedOperation pO = QueryParserUtil.parseOperation(QueryLanguage.SPARQL, curQuery, null); RepositoryConnection repCon = this.repository.getConnection(); try { Query tempq = repCon.prepareQuery(QueryLanguage.SPARQL, curQuery); TupleQuery q = (TupleQuery)tempq; SyncTupleQueryResultHandler rhandler = new SyncTupleQueryResultHandler(); q.evaluate(rhandler); long runTime = System.currentTimeMillis() - startTime; reportRow.add((Long)rhandler.resultCount); reportRow.add((Long)runTime); log.info(curQueryName + ": Query exection time (msec): "+ runTime + ", Total Number of Records: " + rhandler.resultCount); } catch (Exception e) { reportRow.add(null); reportRow.add(null); } finally { repCon.close(); } } return report; }
Example #3
Source File: SesameRepositoryImpl.java From sparql-playground with GNU General Public License v2.0 | 5 votes |
@Override public Query prepareQuery(String sparqlQuery) { try { return conn.prepareQuery(QueryLanguage.SPARQL, sparqlQuery); } catch (RepositoryException | MalformedQueryException e) { e.printStackTrace(); throw new SparqlTutorialException(e); } }
Example #4
Source File: BigdataSailRemoteRepositoryConnection.java From database with GNU General Public License v2.0 | 5 votes |
@Override public Query prepareQuery(final QueryLanguage ql, final String query, final String baseURI) throws RepositoryException, MalformedQueryException { return prepareQuery(ql, query); }
Example #5
Source File: QueryRewriter.java From neo4j-sparql-extension with GNU General Public License v3.0 | 5 votes |
/** * Creates a new query based on a tuple expression and original query. The * new query will have the same type null * ({@link org.openrdf.query.TupleQuery}, * {@link org.openrdf.query.GraphQuery} or * {@link org.openrdf.query.BooleanQuery}) as the given original query. * * @param orig the original query * @param expr the expression used for the new query * @return new query based on expression */ protected Query getExprQuery(ParsedQuery orig, TupleExpr expr) { if (orig instanceof ParsedTupleQuery) { return new SailTupleExprQuery( new ParsedTupleQuery(expr), conn); } else if (orig instanceof ParsedGraphQuery) { return new SailGraphExprQuery( new ParsedGraphQuery(expr), conn); } else { return new SailBooleanExprQuery( new ParsedBooleanQuery(expr), conn); } }
Example #6
Source File: BlazeGraph.java From tinkerpop3 with GNU General Public License v2.0 | 4 votes |
/** * Utility function to set the Query timeout to the global * setting if it is configured. */ protected void setMaxQueryTime(final Query query) { if (maxQueryTime > 0) { query.setMaxQueryTime(maxQueryTime); } }
Example #7
Source File: BigdataSailRemoteRepositoryConnection.java From database with GNU General Public License v2.0 | 3 votes |
@Override public Query prepareQuery(final QueryLanguage ql, final String query) throws RepositoryException, MalformedQueryException { throw new UnsupportedOperationException("please use the specific operation for your query type: prepare[Boolean/Tuple/Graph]Query"); }
Example #8
Source File: QueryRewriter.java From neo4j-sparql-extension with GNU General Public License v3.0 | 2 votes |
/** * Rewrite a given query to add inference. * * @param ql the query language used for the query * @param query the query to rewrite * @return rewritten query that includes inference * @throws MalformedQueryException if the query is malformed * @throws RepositoryException if there was a problem while rewriting */ public Query rewrite(QueryLanguage ql, String query) throws MalformedQueryException, RepositoryException { return rewrite(ql, query, null); }
Example #9
Source File: SesameRepository.java From sparql-playground with GNU General Public License v2.0 | votes |
Query prepareQuery(String sparqlQuery);