| /** |
| * 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.commons.rdf.api; |
| |
| /** |
| * A generalised "triple-like" interface, extended by {@link Triple} and |
| * {@link Quad}. |
| * <p> |
| * A TripleLike statement has at least a {@link #getSubject()}, |
| * {@link #getPredicate()} and {@link #getObject()}, but unlike a {@link Triple} |
| * does not have a formalised {@link Triple#equals(Object)} or |
| * {@link Triple#hashCode()} semantics and is not required to be |
| * <em>immutable</em> or <em>thread-safe</em>. This interfaced can also be used |
| * for <em>generalised triples</em> (e.g. a {@link BlankNode} as predicate). |
| * <p> |
| * Implementations should specialise which specific {@link RDFTerm} types they |
| * return by overriding {@link #getSubject()}, {@link #getPredicate()} and |
| * {@link #getObject()}. |
| * |
| * |
| * @since 0.3.0-incubating |
| * @see Triple |
| * @see Quad |
| * @see QuadLike |
| */ |
| public interface TripleLike { |
| |
| /** |
| * The subject of this statement. |
| * |
| * @return The subject, typically an {@link IRI} or {@link BlankNode}. |
| */ |
| RDFTerm getSubject(); |
| |
| /** |
| * The predicate of this statement. |
| * |
| * @return The predicate, typically an {@link IRI}. |
| */ |
| RDFTerm getPredicate(); |
| |
| /** |
| * The object of this statement. |
| * |
| * @return The object, typically an {@link IRI}, {@link BlankNode} or |
| * {@link Literal}. |
| */ |
| RDFTerm getObject(); |
| } |