Examples with TupleExpr org.eclipse.rdf4j.query.algebra.TupleExpr used on opensource projects

Example 6 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class QueryModelBuilder method visit.

@Override
public Object visit(ASTPathExprUnion node, Object data) throws VisitorException {
    Iterator<ASTPathExpr> args = node.getPathExprList().iterator();
    // Create new sub-graph pattern for optional path expressions
    TupleExpr unionExpr = parseGraphPattern(args.next()).buildTupleExpr();
    while (args.hasNext()) {
        TupleExpr argExpr = parseGraphPattern(args.next()).buildTupleExpr();
        unionExpr = new Union(unionExpr, argExpr);
    }
    graphPattern.addRequiredTE(unionExpr);
    return null;
}

Example 7 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class TupleExprBuilder method visit.

@Override
public Group visit(ASTGroupClause node, Object data) throws VisitorException {
    TupleExpr tupleExpr = (TupleExpr) data;
    Group g = new Group(tupleExpr);
    int childCount = node.jjtGetNumChildren();
    List<String> groupBindingNames = new ArrayList<String>();
    for (int i = 0; i < childCount; i++) {
        String name = (String) node.jjtGetChild(i).jjtAccept(this, g);
        groupBindingNames.add(name);
    }
    g.setGroupBindingNames(groupBindingNames);
    return g;
}

Example 8 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class TupleExprBuilder method visit.

@Override
public TupleExpr visit(ASTDescribeQuery node, Object data) throws VisitorException {
    TupleExpr tupleExpr = null;
    if (node.getWhereClause() != null) {
        // Start with building the graph pattern
        graphPattern = new GraphPattern();
        node.getWhereClause().jjtAccept(this, null);
        tupleExpr = graphPattern.buildTupleExpr();
        // Apply grouping
        Group group = null;
        ASTGroupClause groupNode = node.getGroupClause();
        if (groupNode != null) {
            tupleExpr = (TupleExpr) groupNode.jjtAccept(this, tupleExpr);
            group = (Group) tupleExpr;
        }
        if (node.getHavingClause() != null) {
            if (group == null) {
                // create implicit group
                group = new Group(tupleExpr);
            }
            // Apply HAVING group filter condition
            tupleExpr = processHavingClause(node.getHavingClause(), tupleExpr, group);
        }
        if (node.getOrderClause() != null) {
            if (group == null) {
                // create implicit group
                group = new Group(tupleExpr);
            }
            // Apply result ordering
            tupleExpr = processOrderClause(node.getOrderClause(), tupleExpr, group);
        }
        // Process limit and offset clauses
        ASTLimit limitNode = node.getLimit();
        long limit = -1;
        if (limitNode != null) {
            limit = (Long) limitNode.jjtAccept(this, null);
        }
        ASTOffset offsetNode = node.getOffset();
        long offset = -1;
        if (offsetNode != null) {
            offset = (Long) offsetNode.jjtAccept(this, null);
        }
        if (offset >= 1 || limit >= 0) {
            tupleExpr = new Slice(tupleExpr, offset, limit);
        }
    }
    // Process describe clause last
    return (TupleExpr) node.getDescribe().jjtAccept(this, tupleExpr);
}

Example 9 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class TupleExprBuilder method visit.

@Override
public String visit(ASTGroupCondition node, Object data) throws VisitorException {
    Group group = (Group) data;
    TupleExpr arg = group.getArg();
    Extension extension = null;
    if (arg instanceof Extension) {
        extension = (Extension) arg;
    } else {
        extension = new Extension();
    }
    String name = null;
    ValueExpr ve = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, data);
    boolean aliased = false;
    if (node.jjtGetNumChildren() > 1) {
        aliased = true;
        Var v = (Var) node.jjtGetChild(1).jjtAccept(this, data);
        name = v.getName();
    } else {
        if (ve instanceof Var) {
            name = ((Var) ve).getName();
        } else {
            aliased = true;
            Var v = createAnonVar();
            name = v.getName();
        }
    }
    if (aliased) {
        ExtensionElem elem = new ExtensionElem(ve, name);
        extension.addElement(elem);
    }
    if (extension.getElements().size() > 0 && !(arg instanceof Extension)) {
        extension.setArg(arg);
        group.setArg(extension);
    }
    return name;
}

Example 10 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class TupleExprBuilder method visit.

@Override
public TupleExpr visit(ASTSelectQuery node, Object data) throws VisitorException {
    GraphPattern parentGP = graphPattern;
    // Start with building the graph pattern
    graphPattern = new GraphPattern(parentGP);
    node.getWhereClause().jjtAccept(this, null);
    TupleExpr tupleExpr = graphPattern.buildTupleExpr();
    // Apply grouping
    Group group = null;
    ASTGroupClause groupNode = node.getGroupClause();
    if (groupNode != null) {
        tupleExpr = (TupleExpr) groupNode.jjtAccept(this, tupleExpr);
        group = (Group) tupleExpr;
    }
    final ASTHavingClause havingClause = node.getHavingClause();
    if (havingClause != null) {
        if (group == null) {
            // create implicit group
            group = new Group(tupleExpr);
        }
        // Apply HAVING group filter condition
        tupleExpr = processHavingClause(havingClause, tupleExpr, group);
    }
    // process bindings clause
    final ASTBindingsClause bindingsClause = node.getBindingsClause();
    if (bindingsClause != null) {
        tupleExpr = new Join((BindingSetAssignment) bindingsClause.jjtAccept(this, null), tupleExpr);
    }
    final ASTOrderClause orderClause = node.getOrderClause();
    if (orderClause != null) {
        if (group == null) {
            // create implicit group
            group = new Group(tupleExpr);
        }
        // Apply result ordering
        tupleExpr = processOrderClause(node.getOrderClause(), tupleExpr, group);
    }
    // Apply projection
    tupleExpr = (TupleExpr) node.getSelect().jjtAccept(this, tupleExpr);
    // Process limit and offset clauses
    ASTLimit limitNode = node.getLimit();
    long limit = -1L;
    if (limitNode != null) {
        limit = (Long) limitNode.jjtAccept(this, null);
    }
    ASTOffset offsetNode = node.getOffset();
    long offset = -1L;
    if (offsetNode != null) {
        offset = (Long) offsetNode.jjtAccept(this, null);
    }
    if (offset >= 1L || limit >= 0L) {
        tupleExpr = new Slice(tupleExpr, offset, limit);
    }
    if (parentGP != null) {
        parentGP.addRequiredTE(tupleExpr);
        graphPattern = parentGP;
    }
    return tupleExpr;
}