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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *  http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.any23.vocab;
    19
    20  import org.eclipse.rdf4j.model.IRI;
    21
    22  /**
    23   * The <a href="http://ogp.me/#type_book">Open Graph Protocol Book Type</a> vocabulary.
    24   */
    25  public class OGPBook extends Vocabulary {
    26
    27      private OGPBook() {
    28          super(NS);
    29      }
    30
    31      public static final String NS = "http://ogp.me/ns/book#";
    32
    33      /* BEGIN: http://ogp.me/#type_book */
    34
    35      /** Who wrote this book. */
    36      public static final String BOOK__AUTHOR = "book:author";
    37
    38      /** The ISBN */
    39      public static final String BOOK__ISBN = "book:isbn";
    40
    41      /** The date the book was released. */
    42      public static final String BOOK__RELEASE_DATE = "book:release_date";
    43
    44      /** Tag words associated with this book. */
    45      public static final String BOOK__TAG = "book:tag";
    46
    47      /* END: http://ogp.me/#type_book */
    48
    49      private static OGPBook instance;
    50
    51      public static OGPBook getInstance() {
    52          if (instance == null) {
    53              instance = new OGPBook();
    54          }
    55          return instance;
    56      }
    57
    58      public final IRI NAMESPACE = createIRI(NS);
    59
    60      public final IRI bookAuthor = createProperty(BOOK__AUTHOR);
    61      public final IRI bookIsbn = createProperty(BOOK__ISBN);
    62      public final IRI bookReleaseDate = createProperty(BOOK__RELEASE_DATE);
    63      public final IRI bookTag = createProperty(BOOK__TAG);
    64
    65      @SuppressWarnings("unused")
    66      private IRI createClass(String localName) {
    67          return createClass(NS, localName);
    68      }
    69
    70      private IRI createProperty(String localName) {
    71          return createProperty(NS, localName);
    72      }
    73
    74  }