Examples with QuerySolution org.apache.jena.query.QuerySolution used on opensource projects

Example 11 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class FusekiConfig method servicesAndDatasets.

private static List<DataAccessPoint> servicesAndDatasets(Model model) {
    // Old style configuration file : server to services.
    DatasetDescriptionRegistry dsDescMap = FusekiServer.registryForBuild();
    // ---- Services
    ResultSet rs = FusekiLib.query("SELECT * { ?s fu:services [ list:member ?service ] }", model);
    List<DataAccessPoint> accessPoints = new ArrayList<>();
    if (!rs.hasNext())
        // No "fu:services ( .... )" so try looking for services directly.
        // This means Fuseki2, service configuration files (no server section) work for --conf. 
        rs = FusekiLib.query("SELECT ?service { ?service a fu:Service }", model);
    for (; rs.hasNext(); ) {
        QuerySolution soln = rs.next();
        Resource svc = soln.getResource("service");
        DataAccessPoint acc = FusekiBuilder.buildDataAccessPoint(svc, dsDescMap);
        accessPoints.add(acc);
    }
    return accessPoints;
}

Example 12 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class FusekiConfig method readSystemDatabase.

// ---- System database
/** Read the system database */
public static List<DataAccessPoint> readSystemDatabase(Dataset ds) {
    DatasetDescriptionRegistry dsDescMap = FusekiServer.registryForBuild();
    String qs = StrUtils.strjoinNL(SystemState.PREFIXES, "SELECT * {", "  GRAPH ?g {", "     ?s fu:name ?name ;", "        fu:status ?status .", "  }", "}");
    List<DataAccessPoint> refs = new ArrayList<>();
    ds.begin(ReadWrite.WRITE);
    try {
        ResultSet rs = FusekiLib.query(qs, ds);
        for (; rs.hasNext(); ) {
            QuerySolution row = rs.next();
            Resource s = row.getResource("s");
            Resource g = row.getResource("g");
            Resource rStatus = row.getResource("status");
            //String name = row.getLiteral("name").getLexicalForm() ;
            DatasetStatus status = DatasetStatus.status(rStatus);
            Model m = ds.getNamedModel(g.getURI());
            // Rebase the resource of the service description to the containing graph.
            Resource svc = m.wrapAsResource(s.asNode());
            DataAccessPoint ref = FusekiBuilder.buildDataAccessPoint(svc, dsDescMap);
            refs.add(ref);
        }
        ds.commit();
        return refs;
    } finally {
        ds.end();
    }
}

Example 13 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class FusekiBuilder method addServiceEP.

private static void addServiceEP(DataService dataService, OperationName opName, Resource svc, Property property) {
    String p = "<" + property.getURI() + ">";
    ResultSet rs = query("SELECT * { ?svc " + p + " ?ep}", svc.getModel(), "svc", svc);
    for (; rs.hasNext(); ) {
        QuerySolution soln = rs.next();
        String epName = soln.getLiteral("ep").getLexicalForm();
        Endpoint operation = new Endpoint(opName, epName);
        addServiceEP(dataService, opName, epName);
    //log.info("  " + opName.name + " = " + dataAccessPoint.getName() + "/" + epName) ;
    }
}

Example 14 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class TextOutput method colWidths.

private int[] colWidths(ResultSetRewindable rs) {
    int numCols = rs.getResultVars().size();
    int numRows = 0;
    int[] colWidths = new int[numCols];
    // Widths at least that of the variable name.  Assumes we will print col headings.
    for (int i = 0; i < numCols; i++) colWidths[i] = (rs.getResultVars().get(i)).length();
    // Preparation pass : find the maximum width for each column
    for (; rs.hasNext(); ) {
        numRows++;
        QuerySolution rBind = rs.nextSolution();
        int col = -1;
        for (String s1 : rs.getResultVars()) {
            col++;
            String rVar = s1;
            String s = getVarValueAsString(rBind, rVar);
            if (colWidths[col] < s.length()) {
                colWidths[col] = s.length();
            }
        }
    }
    rs.reset();
    return colWidths;
}

Example 15 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class RDFOutput method asRDF.

public Resource asRDF(Model model, ResultSet resultSet, boolean includeRowIndex) {
    Resource results = model.createResource();
    // This always goes in.
    results.addProperty(RDF.type, ResultSetGraphVocab.ResultSet);
    for (String vName : resultSet.getResultVars()) results.addProperty(ResultSetGraphVocab.resultVariable, vName);
    int count = 0;
    for (; resultSet.hasNext(); ) {
        count++;
        QuerySolution rBind = resultSet.nextSolution();
        Resource thisSolution = model.createResource();
        if (includeTypeProperties)
            thisSolution.addProperty(RDF.type, ResultSetGraphVocab.ResultSolution);
        results.addProperty(ResultSetGraphVocab.solution, thisSolution);
        if (includeRowIndex) {
            // This can lead to equivalent result sets having different graphs
            // Best used if and only if query was completely sorted. 
            Literal x = model.createTypedLiteral(count + "", XSDDatatype.XSDinteger);
            thisSolution.addLiteral(ResultSetGraphVocab.index, x);
        }
        Iterator<String> iter = getAllVars() ? rBind.varNames() : resultSet.getResultVars().iterator();
        for (; iter.hasNext(); ) {
            Resource thisBinding = model.createResource();
            String rVar = iter.next();
            RDFNode n = rBind.get(rVar);
            if (n == null)
                continue;
            //                }
            if (includeTypeProperties)
                thisBinding.addProperty(RDF.type, ResultSetGraphVocab.ResultBinding);
            thisBinding.addProperty(ResultSetGraphVocab.variable, rVar);
            thisBinding.addProperty(ResultSetGraphVocab.value, n);
            thisSolution.addProperty(ResultSetGraphVocab.binding, thisBinding);
        }
    }
    results.addProperty(ResultSetGraphVocab.size, model.createTypedLiteral(count));
    addPrefixes(model);
    return results;
}