Examples with Query org.apache.clerezza.rdf.core.sparql.query.Query used on opensource projects

Example 1 with Query

use of org.apache.clerezza.rdf.core.sparql.query.Query in project stanbol by apache.

the class ClerezzaYard method find.

@Override
public final QueryResultList<Representation> find(FieldQuery parsedQuery) throws YardException, IllegalArgumentException {
    if (parsedQuery == null) {
        throw new IllegalArgumentException("The parsed query MUST NOT be NULL!");
    }
    final SparqlFieldQuery query = SparqlFieldQueryFactory.getSparqlFieldQuery(parsedQuery);
    int limit = QueryUtils.getLimit(query, getConfig().getDefaultQueryResultNumber(), getConfig().getMaxQueryResultNumber());
    Query sparqlQuery;
    //NOTE:
    // - use the endpoint type standard, because we do not know what type of
    //   SPARQL implementation is configured for Clerezza via OSGI
    String sparqlQueryString = SparqlQueryUtils.createSparqlConstructQuery(query, limit, EndpointTypeEnum.Standard);
    try {
        sparqlQuery = QueryParser.getInstance().parse(sparqlQueryString);
    } catch (ParseException e) {
        log.error("ParseException for SPARQL Query in findRepresentation");
        log.error("FieldQuery: " + query);
        log.error("SPARQL Query: " + sparqlQueryString);
        throw new YardException("Unable to parse SPARQL query generated for the parse FieldQuery", e);
    }
    Object resultObject = tcManager.executeSparqlQuery(sparqlQuery, graph);
    final Graph resultGraph;
    if (resultObject instanceof Graph) {
        resultGraph = (Graph) resultObject;
    } else if (resultObject instanceof ImmutableGraph) {
        resultGraph = new IndexedGraph();
        resultGraph.addAll((ImmutableGraph) resultObject);
    } else {
        log.error("Unable to create " + Graph.class + " instance for query reults of type " + resultObject.getClass() + " (this indicates that the used SPARQL Query was not of type CONSTRUCT)");
        log.error("FieldQuery: " + query);
        log.error("SPARQL Query: " + sparqlQueryString);
        throw new YardException("Unable to process results of Query");
    }
    return new RdfQueryResultList(query, resultGraph);
}

Example 2 with Query

use of org.apache.clerezza.rdf.core.sparql.query.Query in project stanbol by apache.

the class ClerezzaRuleStore method getRecipe.

@Override
public Recipe getRecipe(IRI recipeID) throws NoSuchRecipeException, RecipeConstructionException {
    log.info("Called get recipe for id: " + recipeID);
    Graph recipeGraph = null;
    /**
         * Throw a NoSuchRecipeException in case of the TcManager throws a NoSuchEntityException with respect
         * to IRI representing the recipe.
         */
    try {
        recipeGraph = tcManager.getGraph(recipeID);
    } catch (NoSuchEntityException e) {
        throw new NoSuchRecipeException(recipeID.toString());
    }
    Iterator<Triple> descriptions = recipeGraph.filter(null, Symbols.description, null);
    String recipeDescription = null;
    if (descriptions != null && descriptions.hasNext()) {
        recipeDescription = descriptions.next().getObject().toString();
    }
    String query = "SELECT ?rule ?ruleName ?ruleBody ?ruleHead " + "WHERE { " + "	" + recipeID.toString() + " " + Symbols.hasRule.toString() + " ?rule . " + "	?rule " + Symbols.ruleName.toString() + " ?ruleName . " + "	?rule " + Symbols.ruleBody.toString() + " ?ruleBody . " + "	?rule " + Symbols.ruleHead.toString() + " ?ruleHead . " + "}";
    Query sparql;
    try {
        sparql = QueryParser.getInstance().parse(query);
        ResultSet resultSet = tcManager.executeSparqlQuery((SelectQuery) sparql, recipeGraph);
        StringBuilder stanbolRulesBuilder = new StringBuilder();
        boolean firstIteration = true;
        while (resultSet.hasNext()) {
            SolutionMapping solutionMapping = resultSet.next();
            RDFTerm nameResource = solutionMapping.get("ruleName");
            RDFTerm bodyResource = solutionMapping.get("ruleBody");
            RDFTerm headResource = solutionMapping.get("ruleHead");
            StringBuilder stanbolRuleBuilder = new StringBuilder();
            stanbolRuleBuilder.append(((Literal) nameResource).getLexicalForm());
            stanbolRuleBuilder.append("[");
            stanbolRuleBuilder.append(((Literal) bodyResource).getLexicalForm());
            stanbolRuleBuilder.append(" -> ");
            stanbolRuleBuilder.append(((Literal) headResource).getLexicalForm());
            stanbolRuleBuilder.append("]");
            if (!firstIteration) {
                stanbolRulesBuilder.append(" . ");
            } else {
                firstIteration = false;
            }
            String stanbolSyntax = stanbolRuleBuilder.toString();
            log.info("Rule content {}", stanbolSyntax);
            stanbolRulesBuilder.append(stanbolSyntax);
        }
        String stanbolSyntax = stanbolRulesBuilder.toString();
        RuleList ruleList = null;
        if (!stanbolSyntax.isEmpty()) {
            String namespace = recipeID.toString().substring(1, recipeID.toString().length() - 1) + "/";
            ruleList = RuleParserImpl.parse(namespace, stanbolSyntax).getRuleList();
        }
        return new RecipeImpl(recipeID, recipeDescription, ruleList);
    } catch (ParseException e) {
        throw new RecipeConstructionException(e);
    }
}