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/*******************************************************************************
* 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.model;
/**
* An RDF-1.1 blank node (aka bnode, aka anonymous node). A blank node has an identifier to be able to
* compare it to other blank nodes internally. Please note that, conceptually, blank node equality can only be
* determined by examining the statements that refer to them.
*
* @implNote In order to ensure interoperability of concrete classes implementing this interface,
* {@link #equals(Object)} and {@link #hashCode()} methods must be implemented exactly as described in their
* specs.
* @see RDF-1.1 Concepts and Abstract Syntax
*/
public interface BNode extends Resource {
@Override
default boolean isBNode() {
return true;
}
/**
* Retrieves this blank node's identifier.
*
* @return A blank node identifier.
*/
String getID();
/**
* Compares this blank node to another object.
*
* @param o the object to compare this blank node to
* @return {@code true}, if the other object is an instance of {@code BNode} and their {@linkplain #getID() IDs} are
* equal; {@code false}, otherwise.
*/
@Override
boolean equals(Object o);
/**
* Computes the hash code of this blank node.
*
* @return a hash code for this blank node computed as {@link #getID()}{@code .hashCode()}
*/
@Override
int hashCode();
}