org.eclipse.rdf4j.query.algebra.Exists Java Examples

The following examples show how to use org.eclipse.rdf4j.query.algebra.Exists. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: SpinRenderer.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

@Override
public void meet(Not node) throws RDFHandlerException {
	if (node.getArg() instanceof Exists) {
		super.meet(node);
	} else {
		Resource currentSubj = subject;
		flushPendingStatement();
		handler.handleStatement(valueFactory.createStatement(subject, RDF.TYPE, SP.NOT));
		predicate = SP.ARG1_PROPERTY;
		node.getArg().visit(this);
		subject = currentSubj;
		predicate = null;
	}
}

Example #2

Source File: SpinRenderer.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

@Override
public void meet(Exists node) throws RDFHandlerException {
	Resource currentSubj = subject;
	flushPendingStatement();
	Resource op = (node.getParentNode() instanceof Not) ? SP.NOT_EXISTS : SP.EXISTS;
	handler.handleStatement(valueFactory.createStatement(subject, RDF.TYPE, op));
	Resource elementsList = valueFactory.createBNode();
	handler.handleStatement(valueFactory.createStatement(subject, SP.ELEMENTS_PROPERTY, elementsList));
	ListContext elementsCtx = newList(elementsList);
	node.getSubQuery().visit(this);
	endList(elementsCtx);
	subject = currentSubj;
	predicate = null;
}

Example #3

Source File: TupleExprs.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

/**
 * Verifies if the supplied expression is a FILTER (NOT) EXISTS operation
 *
 * @param expr a tuple expression
 * @return true if the supplied expression is a FILTER (NOT) EXISTS operation, false otherwise.
 */
public static boolean isFilterExistsFunction(TupleExpr expr) {
	if (expr instanceof Filter) {
		Filter filter = (Filter) expr;
		if (filter.getCondition() instanceof Exists) {
			return true;
		} else if (filter.getCondition() instanceof Not) {
			Not n = (Not) filter.getCondition();
			return (n.getArg() instanceof Exists);
		}
	}
	return false;
}

Example #4

Source File: TupleExprsTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

@Test
public void isFilterExistsFunctionOnExists() {
	Filter expr = new Filter();
	expr.setArg(new StatementPattern());
	expr.setCondition(new Exists(new StatementPattern()));

	assertThat(isFilterExistsFunction(expr)).isTrue();

}

Example #5

Source File: TupleExprsTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

@Test
public void isFilterExistsFunctionOnNotExist() {
	Filter expr = new Filter();
	expr.setArg(new StatementPattern());
	expr.setCondition(new Not(new Exists(new StatementPattern())));

	assertThat(isFilterExistsFunction(expr)).isTrue();
}

Example #6

Source File: SparqlValueExprRenderer.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

/**
 * @inheritDoc
 */
@Override
public void meet(Exists theOp) throws Exception {
	mBuffer.append(" exists(");
	mBuffer.append(renderTupleExpr(theOp.getSubQuery()));
	mBuffer.append(")");
}

Example #7

Source File: SerqlValueExprRenderer.java From rdf4j with BSD 3-Clause "New" or "Revised" License

5 votes

/**
 * @inheritDoc
 */
@Override
public void meet(Exists theOp) throws Exception {
	mBuffer.append(" exists(");
	// TODO: query render this
	theOp.getSubQuery().visit(this);
	mBuffer.append(")");
}

Example #8

Source File: SPARQLValueExprRenderer.java From semagrow with Apache License 2.0

5 votes

/**
 * @inheritDoc
 */
@Override
public void meet(Exists theOp)
        throws Exception
{
    mBuffer.append(" exists(");
    mBuffer.append(renderTupleExpr(theOp.getSubQuery()));
    mBuffer.append(")");
}

Example #9

Source File: StrictEvaluationStrategy.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public Value evaluate(ValueExpr expr, BindingSet bindings)
		throws QueryEvaluationException {
	if (expr instanceof Var) {
		return evaluate((Var) expr, bindings);
	} else if (expr instanceof ValueConstant) {
		return evaluate((ValueConstant) expr, bindings);
	} else if (expr instanceof BNodeGenerator) {
		return evaluate((BNodeGenerator) expr, bindings);
	} else if (expr instanceof Bound) {
		return evaluate((Bound) expr, bindings);
	} else if (expr instanceof Str) {
		return evaluate((Str) expr, bindings);
	} else if (expr instanceof Label) {
		return evaluate((Label) expr, bindings);
	} else if (expr instanceof Lang) {
		return evaluate((Lang) expr, bindings);
	} else if (expr instanceof LangMatches) {
		return evaluate((LangMatches) expr, bindings);
	} else if (expr instanceof Datatype) {
		return evaluate((Datatype) expr, bindings);
	} else if (expr instanceof Namespace) {
		return evaluate((Namespace) expr, bindings);
	} else if (expr instanceof LocalName) {
		return evaluate((LocalName) expr, bindings);
	} else if (expr instanceof IsResource) {
		return evaluate((IsResource) expr, bindings);
	} else if (expr instanceof IsURI) {
		return evaluate((IsURI) expr, bindings);
	} else if (expr instanceof IsBNode) {
		return evaluate((IsBNode) expr, bindings);
	} else if (expr instanceof IsLiteral) {
		return evaluate((IsLiteral) expr, bindings);
	} else if (expr instanceof IsNumeric) {
		return evaluate((IsNumeric) expr, bindings);
	} else if (expr instanceof IRIFunction) {
		return evaluate((IRIFunction) expr, bindings);
	} else if (expr instanceof Regex) {
		return evaluate((Regex) expr, bindings);
	} else if (expr instanceof Coalesce) {
		return evaluate((Coalesce) expr, bindings);
	} else if (expr instanceof Like) {
		return evaluate((Like) expr, bindings);
	} else if (expr instanceof FunctionCall) {
		return evaluate((FunctionCall) expr, bindings);
	} else if (expr instanceof And) {
		return evaluate((And) expr, bindings);
	} else if (expr instanceof Or) {
		return evaluate((Or) expr, bindings);
	} else if (expr instanceof Not) {
		return evaluate((Not) expr, bindings);
	} else if (expr instanceof SameTerm) {
		return evaluate((SameTerm) expr, bindings);
	} else if (expr instanceof Compare) {
		return evaluate((Compare) expr, bindings);
	} else if (expr instanceof MathExpr) {
		return evaluate((MathExpr) expr, bindings);
	} else if (expr instanceof In) {
		return evaluate((In) expr, bindings);
	} else if (expr instanceof CompareAny) {
		return evaluate((CompareAny) expr, bindings);
	} else if (expr instanceof CompareAll) {
		return evaluate((CompareAll) expr, bindings);
	} else if (expr instanceof Exists) {
		return evaluate((Exists) expr, bindings);
	} else if (expr instanceof If) {
		return evaluate((If) expr, bindings);
	} else if (expr instanceof ListMemberOperator) {
		return evaluate((ListMemberOperator) expr, bindings);
	} else if (expr instanceof ValueExprTripleRef) {
		return evaluate((ValueExprTripleRef) expr, bindings);
	} else if (expr == null) {
		throw new IllegalArgumentException("expr must not be null");
	} else {
		throw new QueryEvaluationException("Unsupported value expr type: " + expr.getClass());
	}
}

Example #10

Source File: StrictEvaluationStrategy.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

public Value evaluate(Exists node, BindingSet bindings)
		throws QueryEvaluationException {
	try (CloseableIteration<BindingSet, QueryEvaluationException> iter = evaluate(node.getSubQuery(), bindings)) {
		return BooleanLiteral.valueOf(iter.hasNext());
	}
}

Example #11

Source File: AbstractQueryModelVisitor.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public void meet(Exists node) throws X {
	meetSubQueryValueOperator(node);
}

Example #12

Source File: TupleExprBuilder.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public Exists visit(ASTExistsFunc node, Object data) throws VisitorException {
	GraphPattern parentGP = graphPattern;
	graphPattern = new GraphPattern(parentGP);

	Exists e = new Exists();
	node.jjtGetChild(0).jjtAccept(this, e);

	TupleExpr te = graphPattern.buildTupleExpr();

	e.setSubQuery(te);

	graphPattern = parentGP;

	return e;
}

Example #13

Source File: TupleExprBuilder.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public Not visit(ASTNotExistsFunc node, Object data) throws VisitorException {

	GraphPattern parentGP = graphPattern;
	graphPattern = new GraphPattern(parentGP);

	Exists e = new Exists();
	node.jjtGetChild(0).jjtAccept(this, e);

	TupleExpr te = graphPattern.buildTupleExpr();

	e.setSubQuery(te);

	graphPattern = parentGP;

	return new Not(e);
}

Example #14

Source File: QueryModelBuilder.java From rdf4j with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public Exists visit(ASTExists node, Object data) throws VisitorException {
	return new Exists((TupleExpr) super.visit(node, data));
}

Example #15

Source File: HalyardValueExprEvaluation.java From Halyard with Apache License 2.0

4 votes

/**
 * Determines which evaluate method to call based on the type of {@link ValueExpr}
 * @param expr the expression to evaluate
 * @param bindings the set of named value bindings the set of named value bindings
 * @return the {@link Value} resulting from the evaluation
 * @throws ValueExprEvaluationException
 * @throws QueryEvaluationException
 */
Value evaluate(ValueExpr expr, BindingSet bindings) throws ValueExprEvaluationException, QueryEvaluationException {
    if (expr instanceof Var) {
        return evaluate((Var) expr, bindings);
    } else if (expr instanceof ValueConstant) {
        return evaluate((ValueConstant) expr, bindings);
    } else if (expr instanceof BNodeGenerator) {
        return evaluate((BNodeGenerator) expr, bindings);
    } else if (expr instanceof Bound) {
        return evaluate((Bound) expr, bindings);
    } else if (expr instanceof Str) {
        return evaluate((Str) expr, bindings);
    } else if (expr instanceof Label) {
        return evaluate((Label) expr, bindings);
    } else if (expr instanceof Lang) {
        return evaluate((Lang) expr, bindings);
    } else if (expr instanceof LangMatches) {
        return evaluate((LangMatches) expr, bindings);
    } else if (expr instanceof Datatype) {
        return evaluate((Datatype) expr, bindings);
    } else if (expr instanceof Namespace) {
        return evaluate((Namespace) expr, bindings);
    } else if (expr instanceof LocalName) {
        return evaluate((LocalName) expr, bindings);
    } else if (expr instanceof IsResource) {
        return evaluate((IsResource) expr, bindings);
    } else if (expr instanceof IsURI) {
        return evaluate((IsURI) expr, bindings);
    } else if (expr instanceof IsBNode) {
        return evaluate((IsBNode) expr, bindings);
    } else if (expr instanceof IsLiteral) {
        return evaluate((IsLiteral) expr, bindings);
    } else if (expr instanceof IsNumeric) {
        return evaluate((IsNumeric) expr, bindings);
    } else if (expr instanceof IRIFunction) {
        return evaluate((IRIFunction) expr, bindings);
    } else if (expr instanceof Regex) {
        return evaluate((Regex) expr, bindings);
    } else if (expr instanceof Coalesce) {
        return evaluate((Coalesce) expr, bindings);
    } else if (expr instanceof Like) {
        return evaluate((Like) expr, bindings);
    } else if (expr instanceof FunctionCall) {
        return evaluate((FunctionCall) expr, bindings);
    } else if (expr instanceof And) {
        return evaluate((And) expr, bindings);
    } else if (expr instanceof Or) {
        return evaluate((Or) expr, bindings);
    } else if (expr instanceof Not) {
        return evaluate((Not) expr, bindings);
    } else if (expr instanceof SameTerm) {
        return evaluate((SameTerm) expr, bindings);
    } else if (expr instanceof Compare) {
        return evaluate((Compare) expr, bindings);
    } else if (expr instanceof MathExpr) {
        return evaluate((MathExpr) expr, bindings);
    } else if (expr instanceof In) {
        return evaluate((In) expr, bindings);
    } else if (expr instanceof CompareAny) {
        return evaluate((CompareAny) expr, bindings);
    } else if (expr instanceof CompareAll) {
        return evaluate((CompareAll) expr, bindings);
    } else if (expr instanceof Exists) {
        return evaluate((Exists) expr, bindings);
    } else if (expr instanceof If) {
        return evaluate((If) expr, bindings);
    } else if (expr instanceof ListMemberOperator) {
        return evaluate((ListMemberOperator) expr, bindings);
    } else if (expr == null) {
        throw new IllegalArgumentException("expr must not be null");
    } else {
        throw new QueryEvaluationException("Unsupported value expr type: " + expr.getClass());
    }
}

Example #16

Source File: HalyardValueExprEvaluation.java From Halyard with Apache License 2.0

2 votes

/**
 * Evaluate a {@link Exists} node
 * @param node the node to evaluate
 * @param bindings the set of named value bindings
 * @return
 * @throws ValueExprEvaluationException
 * @throws QueryEvaluationException
 */
private Value evaluate(Exists node, BindingSet bindings) throws ValueExprEvaluationException, QueryEvaluationException {
    try (CloseableIteration<BindingSet, QueryEvaluationException> iter = parentStrategy.evaluate(node.getSubQuery(), bindings)) {
        return BooleanLiteral.valueOf(iter.hasNext());
    }
}