TupleExpr.java
/*******************************************************************************
* Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Distribution License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*******************************************************************************/
package org.eclipse.rdf4j.query.algebra;
import java.util.Set;
import org.eclipse.rdf4j.common.annotation.Experimental;
import org.eclipse.rdf4j.common.order.AvailableStatementOrder;
/**
* An expression that evaluates to RDF tuples.
*/
public interface TupleExpr extends QueryModelNode {
/**
* Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.
*
* @return A set of binding names.
*/
Set<String> getBindingNames();
/**
* Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple
* expression.
*
* @return A set of binding names.
*/
Set<String> getAssuredBindingNames();
@Override
TupleExpr clone();
@Experimental
default Set<Var> getSupportedOrders(AvailableStatementOrder tripleSource) {
return Set.of();
}
@Experimental
default void setOrder(Var var) {
throw new UnsupportedOperationException("Ordering is not supported for this TupleExpr");
}
@Experimental
default Var getOrder() {
throw new UnsupportedOperationException("Ordering is not supported for this TupleExpr");
}
}