| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.jena.graph; |
| |
| import java.util.Objects; |
| |
| import org.apache.jena.shared.JenaException; |
| import org.apache.jena.shared.PrefixMapping; |
| |
| /** RDF triples as RDF terms. */ |
| public class Node_Triple extends Node_Ext<Triple>{ |
| |
| public static Triple tripleOrNull(Node n) { |
| if ( n instanceof Node_Triple ) { |
| Node_Triple nt = (Node_Triple)n; |
| return nt.get(); |
| } |
| return null; |
| } |
| |
| /** |
| * Return the triple from a Node_Triple. |
| * Throws a {@link JenaException} if not a {@code Node_Triple}. |
| * Pairs with {@link Node#isNodeTriple()} |
| */ |
| public static Triple triple(Node n) { |
| Objects.requireNonNull(n); |
| try { |
| // Instead of adding getTriple() to Node |
| Node_Triple nt = (Node_Triple)n; |
| return nt.get(); |
| } catch (ClassCastException ex) { |
| throw new JenaNodeException("Not a Node_Triple: "+n); |
| } |
| } |
| |
| public static Node_Triple cast(Node n) { |
| return (Node_Triple)n; |
| } |
| |
| public Node_Triple(Node s, Node p, Node o) { |
| this(Triple.create(s, p, o)); |
| } |
| |
| public Node_Triple(Triple triple) { |
| super(triple); |
| } |
| |
| @Override |
| public boolean isConcrete() { |
| return triple(this).isConcrete(); |
| } |
| |
| @Override |
| public boolean isNodeTriple() { |
| return true; |
| } |
| |
| @Override |
| public String toString(PrefixMapping pm, boolean quoting) { |
| return "<< " + label.toString() + " >>"; |
| } |
| } |