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

Example 11 with ValueConstant

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

the class ConstructorBuilder method buildConstructor.

private TupleExpr buildConstructor(TupleExpr bodyExpr, TupleExpr constructExpr, boolean explicitConstructor, boolean distinct, boolean reduced) {
    TupleExpr result = bodyExpr;
    // Retrieve all StatementPattern's from the construct expression
    List<StatementPattern> statementPatterns = StatementPatternCollector.process(constructExpr);
    Set<Var> constructVars = getConstructVars(statementPatterns);
    // Finally, the spo-bindings are again filtered for duplicates.
    if (distinct || reduced) {
        // Create projection that removes all bindings that are not used in the
        // constructor
        ProjectionElemList projElemList = new ProjectionElemList();
        for (Var var : constructVars) {
            // the distinct
            if (!var.isAnonymous() && !var.hasValue()) {
                projElemList.addElement(new ProjectionElem(var.getName()));
            }
        }
        result = new Projection(result, projElemList);
        // Filter the duplicates from these projected bindings
        if (distinct) {
            result = new Distinct(result);
        } else {
            result = new Reduced(result);
        }
    }
    // Create BNodeGenerator's for all anonymous variables
    Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();
    for (Var var : constructVars) {
        if (var.isAnonymous() && !extElemMap.containsKey(var)) {
            ValueExpr valueExpr = null;
            if (var.hasValue()) {
                valueExpr = new ValueConstant(var.getValue());
            } else if (explicitConstructor) {
                // only generate bnodes in case of an explicit constructor
                valueExpr = new BNodeGenerator();
            }
            if (valueExpr != null) {
                extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
            }
        }
    }
    if (!extElemMap.isEmpty()) {
        result = new Extension(result, extElemMap.values());
    }
    // Create a Projection for each StatementPattern in the constructor
    List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();
    for (StatementPattern sp : statementPatterns) {
        ProjectionElemList projElemList = new ProjectionElemList();
        projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
        projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
        projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));
        projections.add(projElemList);
    }
    if (projections.size() == 1) {
        result = new Projection(result, projections.get(0));
    // Note: no need to apply the second duplicate elimination step if
    // there's just one projection
    } else if (projections.size() > 1) {
        result = new MultiProjection(result, projections);
        if (distinct) {
            // Add another distinct to filter duplicate statements
            result = new Distinct(result);
        } else if (reduced) {
            result = new Reduced(result);
        }
    } else {
        // Empty constructor
        result = new EmptySet();
    }
    return result;
}

Example 12 with ValueConstant

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

the class QueryModelBuilder method visit.

@Override
public Object visit(ASTFrom node, Object data) throws VisitorException {
    StatementPattern.Scope scope = StatementPattern.Scope.DEFAULT_CONTEXTS;
    Var contextVar = null;
    if (node.hasContextID()) {
        scope = StatementPattern.Scope.NAMED_CONTEXTS;
        ValueExpr contextID = (ValueExpr) node.getContextID().jjtAccept(this, null);
        if (contextID instanceof Var) {
            contextVar = (Var) contextID;
        } else if (contextID instanceof ValueConstant) {
            ValueConstant vc = (ValueConstant) contextID;
            contextVar = createConstantVar(vc.getValue());
        } else {
            throw new IllegalArgumentException("Unexpected contextID result type: " + contextID.getClass());
        }
    }
    graphPattern.setStatementPatternScope(scope);
    graphPattern.setContextVar(contextVar);
    node.getPathExpr().jjtAccept(this, null);
    return null;
}

Example 13 with ValueConstant

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

the class QueryModelBuilder method visit.

@Override
public FunctionCall visit(ASTFunctionCall node, Object data) throws VisitorException {
    ValueConstant vc = (ValueConstant) node.getURI().jjtAccept(this, null);
    assert vc.getValue() instanceof IRI;
    FunctionCall functionCall = new FunctionCall(vc.getValue().toString());
    for (ASTValueExpr argExpr : node.getArgList().getElements()) {
        functionCall.addArg((ValueExpr) argExpr.jjtAccept(this, null));
    }
    return functionCall;
}

Example 14 with ValueConstant

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

the class ConstructorBuilder method buildConstructor.

private TupleExpr buildConstructor(TupleExpr bodyExpr, TupleExpr constructExpr, boolean explicitConstructor, boolean distinct, boolean reduced) {
    TupleExpr result = bodyExpr;
    // Retrieve all StatementPattern's from the construct expression
    List<StatementPattern> statementPatterns = StatementPatternCollector.process(constructExpr);
    Set<Var> constructVars = getConstructVars(statementPatterns);
    // Finally, the spo-bindings are again filtered for duplicates.
    if (distinct || reduced) {
        // Create projection that removes all bindings that are not used in the
        // constructor
        ProjectionElemList projElemList = new ProjectionElemList();
        for (Var var : constructVars) {
            // the distinct
            if (!var.isAnonymous() && !var.hasValue()) {
                projElemList.addElement(new ProjectionElem(var.getName()));
            }
        }
        result = new Projection(result, projElemList);
        // Filter the duplicates from these projected bindings
        if (distinct) {
            result = new Distinct(result);
        } else {
            result = new Reduced(result);
        }
    }
    // Create BNodeGenerator's for all anonymous variables
    Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();
    for (Var var : constructVars) {
        if (var.isAnonymous() && !extElemMap.containsKey(var)) {
            ValueExpr valueExpr = null;
            if (var.hasValue()) {
                valueExpr = new ValueConstant(var.getValue());
            } else if (explicitConstructor) {
                // only generate bnodes in case of an explicit constructor
                valueExpr = new BNodeGenerator();
            }
            if (valueExpr != null) {
                extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
            }
        }
    }
    if (!extElemMap.isEmpty()) {
        result = new Extension(result, extElemMap.values());
    }
    // Create a Projection for each StatementPattern in the constructor
    List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();
    for (StatementPattern sp : statementPatterns) {
        ProjectionElemList projElemList = new ProjectionElemList();
        projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
        projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
        projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));
        projections.add(projElemList);
    }
    if (projections.size() == 1) {
        result = new Projection(result, projections.get(0));
    // Note: no need to apply the second duplicate elimination step if
    // there's just one projection
    } else if (projections.size() > 1) {
        result = new MultiProjection(result, projections);
        if (distinct) {
            // Add another distinct to filter duplicate statements
            result = new Distinct(result);
        } else if (reduced) {
            result = new Reduced(result);
        }
    } else {
        // Empty constructor
        result = new EmptySet();
    }
    return result;
}

Example 15 with ValueConstant

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

the class UpdateExprBuilder method visit.

@Override
public Clear visit(ASTClear node, Object data) throws VisitorException {
    Clear clear = new Clear();
    clear.setSilent(node.isSilent());
    ASTGraphRefAll graphRef = node.jjtGetChild(ASTGraphRefAll.class);
    if (graphRef.jjtGetNumChildren() > 0) {
        ValueConstant graph = (ValueConstant) graphRef.jjtGetChild(0).jjtAccept(this, data);
        clear.setGraph(graph);
    } else {
        if (graphRef.isDefault()) {
            clear.setScope(Scope.DEFAULT_CONTEXTS);
        } else if (graphRef.isNamed()) {
            clear.setScope(Scope.NAMED_CONTEXTS);
        }
    }
    return clear;
}