Examples with ParsedDescribeQuery org.eclipse.rdf4j.query.parser.ParsedDescribeQuery used on opensource projects

Example 1 with ParsedDescribeQuery

use of org.eclipse.rdf4j.query.parser.ParsedDescribeQuery in project rdf4j by eclipse.

the class SPARQLParser method parseQuery.

@Override
public ParsedQuery parseQuery(String queryStr, String baseURI) throws MalformedQueryException {
    try {
        ASTQueryContainer qc = SyntaxTreeBuilder.parseQuery(queryStr);
        StringEscapesProcessor.process(qc);
        BaseDeclProcessor.process(qc, baseURI);
        Map<String, String> prefixes = PrefixDeclProcessor.process(qc);
        WildcardProjectionProcessor.process(qc);
        BlankNodeVarProcessor.process(qc);
        if (qc.containsQuery()) {
            // handle query operation
            TupleExpr tupleExpr = buildQueryModel(qc);
            ParsedQuery query;
            ASTQuery queryNode = qc.getQuery();
            if (queryNode instanceof ASTSelectQuery) {
                query = new ParsedTupleQuery(queryStr, tupleExpr);
            } else if (queryNode instanceof ASTConstructQuery) {
                query = new ParsedGraphQuery(queryStr, tupleExpr, prefixes);
            } else if (queryNode instanceof ASTAskQuery) {
                query = new ParsedBooleanQuery(queryStr, tupleExpr);
            } else if (queryNode instanceof ASTDescribeQuery) {
                query = new ParsedDescribeQuery(queryStr, tupleExpr, prefixes);
            } else {
                throw new RuntimeException("Unexpected query type: " + queryNode.getClass());
            }
            // Handle dataset declaration
            Dataset dataset = DatasetDeclProcessor.process(qc);
            if (dataset != null) {
                query.setDataset(dataset);
            }
            return query;
        } else {
            throw new IncompatibleOperationException("supplied string is not a query operation");
        }
    } catch (ParseException e) {
        throw new MalformedQueryException(e.getMessage(), e);
    } catch (TokenMgrError e) {
        throw new MalformedQueryException(e.getMessage(), e);
    }
}

Example 2 with ParsedDescribeQuery

use of org.eclipse.rdf4j.query.parser.ParsedDescribeQuery in project rdf4j by eclipse.

the class QueryBuilderFactory method describe.

/**
 * Create a QueryBuilder for creating a describe query
 *
 * @param theVars
 *        the variables to be described
 * @param theValues
 *        the specific bound URI values to be described
 * @return a describe query builder
 */
public static QueryBuilder<ParsedGraphQuery> describe(String[] theVars, Resource... theValues) {
    QueryBuilder<ParsedGraphQuery> aBuilder = new AbstractQueryBuilder<ParsedGraphQuery>(new ParsedDescribeQuery());
    aBuilder.reduced();
    aBuilder.addProjectionVar("descr_subj", "descr_pred", "descr_obj");
    GroupBuilder<?, ?> aGroup = aBuilder.group();
    if (theVars != null) {
        for (String aVar : theVars) {
            Var aVarObj = new Var(aVar);
            aVarObj.setAnonymous(true);
            aGroup.filter().or(new SameTerm(aVarObj, new Var("descr_subj")), new SameTerm(aVarObj, new Var("descr_obj")));
        }
    }
    if (theValues != null) {
        for (Resource aVar : theValues) {
            Var aSubjVar = new Var("descr_subj");
            aSubjVar.setAnonymous(true);
            Var aObjVar = new Var("descr_obj");
            aObjVar.setAnonymous(true);
            aGroup.filter().or(new SameTerm(new ValueConstant(aVar), aSubjVar), new SameTerm(new ValueConstant(aVar), aObjVar));
        }
    }
    aGroup.atom("descr_subj", "descr_pred", "descr_obj");
    return aBuilder;
}