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.service;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.b3log.latke.Keys;
  import org.b3log.latke.ioc.Inject;
  import org.b3log.latke.repository.RepositoryException;
  import org.b3log.latke.repository.Transaction;
  import org.b3log.latke.service.annotation.Service;
  import org.b3log.solo.model.ArchiveDate;
  import org.b3log.solo.repository.ArchiveDateArticleRepository;
  import org.b3log.solo.repository.ArchiveDateRepository;
  import org.json.JSONObject;
  
  import java.util.List;
  
  /**
   * Archive date query service.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.0, Mar 20, 2019
   * @since 3.4.0
   */
  @Service
  public class ArchiveDateMgmtService {
  
      /**
       * Logger.
       */
      private static final Logger LOGGER = LogManager.getLogger(ArchiveDateMgmtService.class);
  
      /**
       * Archive date repository.
       */
      @Inject
      private ArchiveDateRepository archiveDateRepository;
  
      /**
       * Archive date-Article repository.
       */
      @Inject
      private ArchiveDateArticleRepository archiveDateArticleRepository;
  
  
      /**
       * Removes all unused archive dates.
       *
       * @return a list of archive dates, returns an empty list if not found
       */
      public void removeUnusedArchiveDates() {
          final Transaction transaction = archiveDateRepository.beginTransaction();
          try {
              final List<JSONObject> archiveDates = archiveDateRepository.getArchiveDates();
              for (final JSONObject archiveDate : archiveDates) {
                  if (1 > archiveDate.optInt(ArchiveDate.ARCHIVE_DATE_T_PUBLISHED_ARTICLE_COUNT)) {
                      final String archiveDateId = archiveDate.optString(Keys.OBJECT_ID);
                      archiveDateRepository.remove(archiveDateId);
                  }
              }
              transaction.commit();
          } catch (final RepositoryException e) {
              if (transaction.isActive()) {
                  transaction.rollback();
              }
  
              LOGGER.log(Level.ERROR, "Gets archive dates failed", e);
          }
      }
  }
  