content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.persistence.repository;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.jdbc.core.RowMapper;
  
  import java.sql.ResultSet;
  import java.sql.ResultSetMetaData;
  import java.sql.SQLException;
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * Manager RowMapper {@link RowMapper} for database object mapping.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public final class RowMapperManager {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(RowMapperManager.class);
      
      public static final MapRowMapper MAP_ROW_MAPPER = new MapRowMapper();
      
      public static Map<String, RowMapper> mapperMap = new HashMap<>(16);
      
      static {
          // MAP_ROW_MAPPER
          mapperMap.put(MAP_ROW_MAPPER.getClass().getCanonicalName(), MAP_ROW_MAPPER);
      }
      
      public static <D> RowMapper<D> getRowMapper(String classFullName) {
          return (RowMapper<D>) mapperMap.get(classFullName);
      }
      
      /**
       * Register custom row mapper to manager.
       *
       * @param classFullName full class name of row mapper handled.
       * @param rowMapper     row mapper
       * @param <D>           class of row mapper handled
       */
      public static synchronized <D> void registerRowMapper(String classFullName, RowMapper<D> rowMapper) {
          if (mapperMap.containsKey(classFullName)) {
              LOGGER.warn("row mapper {} conflicts, {} will be replaced by {}", classFullName,
                      mapperMap.get(classFullName).getClass().getCanonicalName(),
                      rowMapper.getClass().getCanonicalName());
          }
          mapperMap.put(classFullName, rowMapper);
      }
      
      public static final class MapRowMapper implements RowMapper<Map<String, Object>> {
          
          @Override
          public Map<String, Object> mapRow(ResultSet resultSet, int rowNum) throws SQLException {
              ResultSetMetaData metaData = resultSet.getMetaData();
              int columnCount = metaData.getColumnCount();
              Map<String, Object> map = new LinkedHashMap<>(columnCount);
              for (int i = 1; i <= columnCount; i++) {
                  map.put(metaData.getColumnLabel(i), resultSet.getObject(i));
              }
              return map;
          }
      }
      
  }
  