content: /*
   * Solo - A small and beautiful blogging system written in Java.
   * Copyright (c) 2010-present, b3log.org
   *
   * Solo is licensed under Mulan PSL v2.
   * You can use this software according to the terms and conditions of the Mulan PSL v2.
   * You may obtain a copy of Mulan PSL v2 at:
   *         http://license.coscl.org.cn/MulanPSL2
   * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
   * See the Mulan PSL v2 for more details.
   */
  package org.b3log.solo.cache;
  
  import org.b3log.latke.Keys;
  import org.b3log.latke.ioc.Singleton;
  import org.b3log.solo.model.Option;
  import org.b3log.solo.util.Solos;
  import org.json.JSONObject;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Option cache.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.1.0.1, Sep 25, 2018
   * @since 2.3.0
   */
  @Singleton
  public class OptionCache {
  
      /**
       * Option cache.
       */
      private final Map<String, JSONObject> cache = new ConcurrentHashMap<>();
  
      /**
       * Category option caches.
       */
      private final Map<String, JSONObject> categoryCache = new ConcurrentHashMap<>();
  
      /**
       * Removes a category cache specified by the given category.
       *
       * @param category the given category
       */
      public void removeCategory(final String category) {
          categoryCache.remove(category);
      }
  
      /**
       * Gets merged options as a JSON object for the specified category
       *
       * @param category the specified category
       * @return merged options
       */
      public JSONObject getCategory(final String category) {
          JSONObject ret = categoryCache.get(category);
          if (null == ret) {
              return null;
          }
  
          return Solos.clone(ret);
      }
  
      /**
       * Puts the specified merged options with the specified category.
       *
       * @param category      the specified category
       * @param mergedOptions the specified merged options
       */
      public void putCategory(final String category, final JSONObject mergedOptions) {
          categoryCache.put(category, mergedOptions);
      }
  
      /**
       * Gets an option by the specified option id.
       *
       * @param id the specified option id
       * @return option, returns {@code null} if not found
       */
      public JSONObject getOption(final String id) {
          final JSONObject option = cache.get(id);
          if (null == option) {
              return null;
          }
  
          return Solos.clone(option);
      }
  
      /**
       * Adds or updates the specified option.
       *
       * @param option the specified option
       */
      public void putOption(final JSONObject option) {
          cache.put(option.optString(Keys.OBJECT_ID), Solos.clone(option));
  
          final String category = option.optString(Option.OPTION_CATEGORY);
          removeCategory(category);
      }
  
      /**
       * Removes an option by the specified option id.
       *
       * @param id the specified option id
       */
      public void removeOption(final String id) {
          final JSONObject option = getOption(id);
          if (null == option) {
              return;
          }
  
          final String category = option.optString(Option.OPTION_CATEGORY);
          removeCategory(category);
  
          cache.remove(id);
      }
  
      /**
       * Clears all cached data.
       */
      public void clear() {
          cache.clear();
          categoryCache.clear();
      }
  }
  