Examples with RowSet org.apache.jena.sparql.exec.RowSet used on opensource projects

Example 1 with RowSet

use of org.apache.jena.sparql.exec.RowSet in project jena by apache.

the class Service method exec.

public static QueryIterator exec(OpService op, Context context) {
    if (context == null)
        context = emptyContext;
    if (context != null && context.isFalse(httpServiceAllowed))
        throw new QueryExecException("SERVICE execution disabled");
    if (!op.getService().isURI())
        throw new QueryExecException("Service URI not bound: " + op.getService());
    boolean silent = op.getSilent();
    // [QExec] Add getSubOpUnmodified();
    if (!op.getService().isURI())
        throw new QueryExecException("Service URI not bound: " + op.getService());
    String serviceURL = op.getService().getURI();
    Op opRemote = op.getSubOp();
    Query query;
    if (false) {
        // ***** Interacts with substitution.
        Element el = op.getServiceElement().getElement();
        if (el instanceof ElementSubQuery)
            query = ((ElementSubQuery) el).getQuery();
        else {
            query = QueryFactory.create();
            query.setQueryPattern(el);
            query.setResultVars();
        }
    }
    // This relies on the observation that the query was originally correct,
    // so reversing the scope renaming is safe (it merely restores the
    // algebra expression).
    // 
    // Any variables that reappear should be internal ones that were hidden
    // by renaming in the first place.
    // 
    // Any substitution is also safe because it replaces variables by
    // values.
    // 
    // It is safer to rename/unrename than skipping SERVICE during rename
    // to avoid substituting hidden variables.
    Op opRestored = Rename.reverseVarRename(opRemote, true);
    query = OpAsQuery.asQuery(opRestored);
    // Transforming: Same object means "no change"
    boolean requiresRemapping = false;
    Map<Var, Var> varMapping = null;
    if (!opRestored.equals(opRemote)) {
        varMapping = new HashMap<>();
        Set<Var> originalVars = OpVars.visibleVars(op);
        Set<Var> remoteVars = OpVars.visibleVars(opRestored);
        for (Var v : originalVars) {
            if (v.getName().contains("/")) {
                // A variable which was scope renamed so has a different name
                String origName = v.getName().substring(v.getName().lastIndexOf('/') + 1);
                Var remoteVar = Var.alloc(origName);
                if (remoteVars.contains(remoteVar)) {
                    varMapping.put(remoteVar, v);
                    requiresRemapping = true;
                }
            } else {
                // A variable which does not have a different name
                if (remoteVars.contains(v))
                    varMapping.put(v, v);
            }
        }
    }
    // -- Setup
    // boolean withCompression = context.isTrueOrUndef(httpQueryCompression);
    long timeoutMillis = timeoutFromContext(context);
    // RegistryServiceModifier is applied by QueryExecHTTP
    Params serviceParams = getServiceParamsFromContext(serviceURL, context);
    HttpClient httpClient = chooseHttpClient(serviceURL, context);
    QuerySendMode querySendMode = chooseQuerySendMode(serviceURL, context, QuerySendMode.asGetWithLimitBody);
    // -- End setup
    // Build the execution
    QueryExecHTTP qExec = QueryExecHTTP.newBuilder().endpoint(serviceURL).timeout(timeoutMillis, TimeUnit.MILLISECONDS).query(query).params(serviceParams).context(context).httpClient(httpClient).sendMode(querySendMode).build();
    try {
        // Detach from the network stream.
        RowSet rowSet = qExec.select().materialize();
        QueryIterator qIter = QueryIterPlainWrapper.create(rowSet);
        if (requiresRemapping)
            qIter = QueryIter.map(qIter, varMapping);
        return qIter;
    } catch (HttpException ex) {
        throw QueryExceptionHTTP.rewrap(ex);
    }
}

Example 2 with RowSet

use of org.apache.jena.sparql.exec.RowSet in project jena by apache.

the class QueryExecHTTP method select.

@Override
public RowSet select() {
    checkNotClosed();
    check(QueryType.SELECT);
    RowSet rs = execRowSet();
    return rs;
}

Example 3 with RowSet

use of org.apache.jena.sparql.exec.RowSet in project jena by apache.

the class TestProtobufResultSet method test.

private static ResultSetRewindable test(ResultSetRewindable resultSet) {
    resultSet.reset();
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ResultSetFormatter.output(out, resultSet, ResultSetLang.RS_Protobuf);
    resultSet.reset();
    ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
    RowSet rs$ = ProtobufRDF.readRowSet(in);
    ResultSetRewindable resultSet2 = ResultSetFactory.makeRewindable(rs$);
    // Includes bnode labels.
    ResultSetCompare.equalsExact(resultSet, resultSet2);
    resultSet.reset();
    resultSet2.reset();
    return resultSet2;
}

Example 4 with RowSet

use of org.apache.jena.sparql.exec.RowSet in project jena by apache.

the class RowSetReaderJSON method process.

private static QueryExecResult process(InputStream in, Context context) {
    if (context == null)
        context = ARQ.getContext();
    RowSetJSON exec = new RowSetJSON(context);
    exec.parse(in);
    if (exec.rows != null) {
        // RowSet rs = RowSetStream.create(exec.vars, exec.rows.iterator());
        RowSet rs = RowSetStream.create(exec.vars, exec.rows.iterator());
        return new QueryExecResult(rs);
    } else
        return new QueryExecResult(exec.booleanResult);
}

Example 5 with RowSet

use of org.apache.jena.sparql.exec.RowSet in project jena by apache.

the class TestSolverTDB method solve_04.

@Test
public void solve_04() {
    // Below everything.
    RowSet rs1 = exec("(bgp (:a :p :a))");
    RowSet rs2 = results("empty");
    equals(rs1, rs2);
}