content: /*
   * Symphony - A modern community (forum/BBS/SNS/blog) platform written in Java.
   * Copyright (C) 2012-present, b3log.org
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   */
  package org.b3log.symphony.cache;
  
  import org.b3log.latke.Keys;
  import org.b3log.latke.cache.Cache;
  import org.b3log.latke.cache.CacheFactory;
  import org.b3log.latke.ioc.Singleton;
  import org.b3log.symphony.model.Comment;
  import org.b3log.symphony.util.JSONs;
  import org.json.JSONObject;
  
  /**
   * Comment cache.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.0, Sep 1, 2016
   * @since 1.6.0
   */
  @Singleton
  public class CommentCache {
  
      /**
       * Comment cache.
       */
      private static final Cache cache = CacheFactory.getCache(Comment.COMMENTS);
  
      /**
       * Gets a comment by the specified comment id.
       *
       * @param id the specified comment id
       * @return comment, returns {@code null} if not found
       */
      public JSONObject getComment(final String id) {
          final JSONObject comment = cache.get(id);
          if (null == comment) {
              return null;
          }
  
          return JSONs.clone(comment);
      }
  
      /**
       * Adds or updates the specified comment.
       *
       * @param comment the specified comment
       */
      public void putComment(final JSONObject comment) {
          cache.put(comment.optString(Keys.OBJECT_ID), JSONs.clone(comment));
      }
  
      /**
       * Removes a comment by the specified comment id.
       *
       * @param id the specified comment id
       */
      public void removeComment(final String id) {
          cache.remove(id);
      }
  }
  