org.eclipse.rdf4j.query.algebra.ValueConstant Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rdf4j-queryalgebra-model Show documentation
Show all versions of rdf4j-queryalgebra-model Show documentation
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;
import org.eclipse.rdf4j.model.Value;
/**
* A ValueExpr with a constant value.
*/
public class ValueConstant extends AbstractQueryModelNode implements ValueExpr {
/*-----------*
* Variables *
*-----------*/
private Value value;
/*--------------*
* Constructors *
*--------------*/
public ValueConstant() {
}
public ValueConstant(Value value) {
setValue(value);
}
/*---------*
* Methods *
*---------*/
public Value getValue() {
return value;
}
public void setValue(Value value) {
assert value != null : "value must not be null";
this.value = value;
}
@Override
public void visit(QueryModelVisitor visitor) throws X {
visitor.meet(this);
}
@Override
public void visitChildren(QueryModelVisitor visitor) throws X {
// no-op
}
@Override
public void replaceChildNode(QueryModelNode current, QueryModelNode replacement) {
throw new IllegalArgumentException("Node is not a child node: " + current);
}
@Override
public String getSignature() {
StringBuilder sb = new StringBuilder(64);
sb.append(super.getSignature());
sb.append(" (value=");
sb.append(value.toString());
sb.append(")");
return sb.toString();
}
@Override
public boolean equals(Object other) {
if (other instanceof ValueConstant) {
ValueConstant o = (ValueConstant) other;
return value.equals(o.getValue());
}
return false;
}
@Override
public int hashCode() {
return value.hashCode();
}
@Override
public ValueConstant clone() {
return (ValueConstant) super.clone();
}
}