/*

  * 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.any23.vocab;

 import org.openrdf.model.URI;

 /**

  * The <a href="http://ogp.me/">Open Graph Protocol</> vocabulary.

  *

  * @author Michele Mostarda (mostarda@fbk.eu)

  */

 public class OGP extends Vocabulary {

     public static final String NS = "http://ogp.me/ns#";

     /* BEGIN: Basic Metadata. */

     /** The title of your object as it should appear within the graph (Facebook Graph API). */

     public static final String TITLE = "title";

     /** The type of your object, e.g., <code>video.movie</code>.

      *  Depending on the type you specify, other properties may also be required. */

     public static final String TYPE  = "type";

     /** An image URL which should represent your object within the graph. */

     public static final String URL   = "url";

     /** The canonical URL of your object that will be used as its permanent ID in the graph (Facebook Graph API). */

     public static final String IMAGE = "image";

     /* END: Basic Metadata. */

     /* BEGIN: Optional Metadata. */

     /** A URL to an audio file to accompany this object. */

     public static final String AUDIO = "audio";

     /** A one to two sentence description of your object. */

     public static final String DESCRIPTION = "description";

     /** The word that appears before this object's title in a sentence. An enum of (a, an, the, "", auto).

      *  If auto is chosen, the consumer of your data should chose between "a" or "an". Default is "" (blank). */

     public static final String DETERMINER = "determiner";

     /** The locale these tags are marked up in. Of the format <code>language_TERRITORY</code>.

      *  Default is <code>en_US</code>. */

     public static final String LOCALE = "locale";

     /** An array of other locales this page is available in. */

     public static final String LOCALE__ALTERNATE = "locale:alternate";

     /** If your object is part of a larger web site, the name which should be

      *  displayed for the overall site. e.g., <b>IMDb</b>. */

     public static final String SITE_NAME = "site_name";

     /** A URL to a video file that complements this object. */

     public static final String VIDEO = "video";

     /* END: Optional Metadata. */

     /* BEGIN: Structured Properties. */

     /** Identical to <code>og:image</code>. */

     public static final String IMAGE__URL        = "image:url";

     /** An alternate url to use if the webpage requires <b>HTTPS</b>. */

     public static final String IMAGE__SECURE_URL = "image:secure_url";

     /** A <i>MIME type</i> for this image. */

     public static final String IMAGE__TYPE       = "image:type";

     /** The number of pixels wide. */

     public static final String IMAGE__WIDTH      = "image:width";

     /** The number of pixels high. */

     public static final String IMAGE__HEIGHT     = "image:height";

     /** Video URL. */

     public static final String VIDEO__URL        = "video:url";

     /** An alternate url to use if the webpage requires <b>HTTPS</b>. */

     public static final String VIDEO__SECURE_URL = "video:secure_url";

     /** A <i>MIME type</i> for this video. */

     public static final String VIDEO__TYPE       = "video:type";

     /** The number of pixels wide. */

     public static final String VIDEO__WIDTH      = "video:width";

     /** The number of pixels height. */

     public static final String VIDEO__HEIGHT     = "video:height";

     /** An alternate url to use if the webpage requires <b>HTTPS</b>. */

     public static final String AUDIO__SECURE_URL = "audio:secure_url";

     /** A <i>MIME type</i> for this audio. */

     public static final String AUDIO__TYPE       = "audio:type";

     /* END: Structured Properties. */

     private static OGP instance;

     public static OGP getInstance() {

         if(instance == null) {

             instance = new OGP();

         }

         return instance;

     }

     public final URI NAMESPACE = createURI(NS);

     public final URI title           = createProperty(TITLE);

     public final URI type            = createProperty(TYPE);

     public final URI url             = createProperty(URL);

     public final URI image           = createProperty(IMAGE);

     public final URI description     = createProperty(DESCRIPTION);

     public final URI determiner      = createProperty(DETERMINER);

     public final URI locale          = createProperty(LOCALE);

     public final URI localeAlternate = createProperty(LOCALE__ALTERNATE);

     public final URI siteName        = createProperty(SITE_NAME);

     public final URI video           = createProperty(VIDEO);

     public final URI imageURL       = createProperty(IMAGE__URL);

     public final URI imageSecureURL = createProperty(IMAGE__SECURE_URL);

     public final URI imageType      = createProperty(IMAGE__TYPE);

     public final URI imageWidth     = createProperty(IMAGE__WIDTH);

     public final URI imageHeight    = createProperty(IMAGE__HEIGHT);

     public final URI videoURL       = createProperty(VIDEO__URL);

     public final URI videoSecureURL = createProperty(VIDEO__SECURE_URL);

     public final URI videoType      = createProperty(VIDEO__TYPE);

     public final URI videoWidth     = createProperty(VIDEO__WIDTH);

     public final URI videoHeight    = createProperty(VIDEO__HEIGHT);

     public final URI audio          = createProperty(AUDIO);

     public final URI audioSecureURL = createProperty(AUDIO__SECURE_URL);

     public final URI audioType      = createProperty(AUDIO__TYPE);

     private URI createClass(String localName) {

         return createClass(NS, localName);

     }

     private URI createProperty(String localName) {

         return createProperty(NS, localName);

     }

     private OGP() {

         super(NS);

     }

 }