org.eclipse.rdf4j.model.Value Maven / Gradle / Ivy
/*******************************************************************************
* 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;
import java.io.Serializable;
/**
* The supertype of all RDF model objects (URIs, blank nodes and literals).
*/
public interface Value extends Serializable {
/**
* Check if the object is an instance of the given type. Typically 2x than using instanceof.
*
* For implementers: This default implementation is overridden in the repsective sub-interface.
*
* @return true if instance of {@link BNode}
*/
default boolean isBNode() {
return false;
}
/**
* Check if the object is an instance of the given type. Typically 2x than using instanceof.
*
* For implementers: This default implementation is overridden in the repsective sub-interface.
*
* @return true if instance of {@link IRI}
*/
default boolean isIRI() {
return false;
}
/**
* Check if the object is an instance of the given type. Typically 2x than using instanceof.
*
* For implementers: This default implementation is overridden in the repsective sub-interface.
*
* @return true if instance of {@link Resource}
*/
default boolean isResource() {
return false;
}
/**
* Check if the object is an instance of the given type. Typically 2x than using instanceof.
*
* For implementers: This default implementation is overridden in the repsective sub-interface.
*
* @return true if instance of {@link Literal}
*/
default boolean isLiteral() {
return false;
}
/**
* Check if the object is an instance of the given type. Typically 2x than using instanceof.
*
* For implementers: This default implementation is overridden in the repsective sub-interface.
*
* @return true if instance of {@link Triple}
*/
default boolean isTriple() {
return false;
}
/**
* Returns the String-value of a Value object. This returns either a {@link Literal}'s label, a
* {@link IRI}'s URI or a {@link BNode}'s ID.
*/
String stringValue();
}