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.model.Pagination;
  import org.b3log.latke.repository.Query;
  import org.b3log.latke.repository.SortDirection;
  import org.b3log.latke.service.ServiceException;
  import org.b3log.latke.service.annotation.Service;
  import org.b3log.latke.util.Paginator;
  import org.b3log.solo.model.Page;
  import org.b3log.solo.repository.PageRepository;
  import org.json.JSONObject;
  
  import java.util.List;
  
  /**
   * Page query service.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.1, Apr 19, 2019
   * @since 0.4.0
   */
  @Service
  public class PageQueryService {
  
      /**
       * Logger.
       */
      private static final Logger LOGGER = LogManager.getLogger(PageQueryService.class);
  
      /**
       * Page repository.
       */
      @Inject
      private PageRepository pageRepository;
  
      /**
       * Gets a page by the specified page id.
       *
       * @param pageId the specified page id
       * @return for example,
       * <pre>
       * {
       *     "page": {
       *         "oId": "",
       *         "pageTitle": "",
       *         "pageOrder": int,
       *         "pagePermalink": "",
       *         "pageOpenTarget": "",
       *         "pageIcon": ""
       *     }
       * }
       * </pre>, returns {@code null} if not found
       * @throws ServiceException service exception
       */
      public JSONObject getPage(final String pageId) throws ServiceException {
          final JSONObject ret = new JSONObject();
          try {
              final JSONObject page = pageRepository.get(pageId);
              if (null == page) {
                  return null;
              }
              ret.put(Page.PAGE, page);
              return ret;
          } catch (final Exception e) {
              LOGGER.log(Level.ERROR, e.getMessage(), e);
              throw new ServiceException(e);
          }
      }
  
      /**
       * Gets pages by the specified request json object.
       *
       * @param requestJSONObject the specified request json object, for example,
       *                          "paginationCurrentPageNum": 1,
       *                          "paginationPageSize": 20,
       *                          "paginationWindowSize": 10
       *                          see {@link Pagination} for more details
       * @return for example,
       * <pre>
       * {
       *     "pagination": {
       *         "paginationPageCount": 100,
       *         "paginationPageNums": [1, 2, 3, 4, 5]
       *     },
       *     "pages": [{
       *         "oId": "",
       *         "pageTitle": "",
       *         "pageOrder": int,
       *         "pagePermalink": "",
       *         "pageOpenTarget": ""
       *      }, ....]
       * }
       * </pre>
       * @throws ServiceException service exception
       * @see Pagination
       */
      public JSONObject getPages(final JSONObject requestJSONObject) throws ServiceException {
          final JSONObject ret = new JSONObject();
          try {
              final int currentPageNum = requestJSONObject.getInt(Pagination.PAGINATION_CURRENT_PAGE_NUM);
              final int pageSize = requestJSONObject.getInt(Pagination.PAGINATION_PAGE_SIZE);
              final int windowSize = requestJSONObject.getInt(Pagination.PAGINATION_WINDOW_SIZE);
              final Query query = new Query().setPage(currentPageNum, pageSize).addSort(Page.PAGE_ORDER, SortDirection.ASCENDING).setPageCount(1);
              final JSONObject result = pageRepository.get(query);
              final int pageCount = result.getJSONObject(Pagination.PAGINATION).getInt(Pagination.PAGINATION_PAGE_COUNT);
              final JSONObject pagination = new JSONObject();
              final List<Integer> pageNums = Paginator.paginate(currentPageNum, pageSize, pageCount, windowSize);
              pagination.put(Pagination.PAGINATION_PAGE_COUNT, pageCount);
              pagination.put(Pagination.PAGINATION_PAGE_NUMS, pageNums);
              final List<JSONObject> pages = (List<JSONObject>) result.opt(Keys.RESULTS);
              ret.put(Pagination.PAGINATION, pagination);
              ret.put(Page.PAGES, (Object) pages);
              return ret;
          } catch (final Exception e) {
              LOGGER.log(Level.ERROR, "Gets pages failed", e);
              throw new ServiceException(e);
          }
      }
  }
  