| /* |
| * 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.clerezza.commons.rdf; |
| |
| /** |
| * A structure containing a subject, a predicate, and an object. |
| * Also known as a statement. |
| * |
| * @author reto |
| */ |
| public interface Triple { |
| |
| BlankNodeOrIRI getSubject(); |
| |
| IRI getPredicate(); |
| |
| RDFTerm getObject(); |
| |
| /** |
| * |
| * @param obj |
| * @return true iff subject, predicate, and object of both triples are equal |
| */ |
| @Override |
| boolean equals(Object obj); |
| |
| /** |
| * The hash code is computed as follow |
| * (subject.hashCode() >> 1) ^ predicate.hashCode() ^ object.hashCode() << 1) |
| * |
| * Note that the hash returned is computed including the hash of BNodes, so |
| * it is not blank-node blind as in Graph. |
| * |
| * This would have to change if triple should extend Graph |
| * |
| * @return hash code |
| */ |
| @Override |
| int hashCode(); |
| |
| } |