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A generic query algebra for RDF queries.
/*******************************************************************************
* 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;
/**
* A BNode generator, which generates a new BNode each time it needs to supply a value.
*/
public class BNodeGenerator extends AbstractQueryModelNode implements ValueExpr {
private ValueExpr nodeIdExpr = null;
/*--------------*
* Constructors *
*--------------*/
public BNodeGenerator() {
super();
}
public BNodeGenerator(ValueExpr nodeIdExpr) {
super();
setNodeIdExpr(nodeIdExpr);
}
/*---------*
* Methods *
*---------*/
public ValueExpr getNodeIdExpr() {
return nodeIdExpr;
}
public void setNodeIdExpr(ValueExpr nodeIdExpr) {
this.nodeIdExpr = nodeIdExpr;
}
@Override
public void visit(QueryModelVisitor visitor) throws X {
visitor.meet(this);
}
@Override
public void visitChildren(QueryModelVisitor visitor) throws X {
// no-op
}
@Override
public boolean equals(Object other) {
return other instanceof BNodeGenerator;
}
@Override
public int hashCode() {
return "BNodeGenerator".hashCode();
}
@Override
public BNodeGenerator clone() {
return (BNodeGenerator) super.clone();
}
}