/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.shardingsphere.infra.database.core.metadata.database.datatype;
  
  import com.cedarsoftware.util.CaseInsensitiveMap;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseTypeRegistry;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.Map;
  
  /**
   * Data type loader.
   */
  public final class DataTypeLoader {
      
      /**
       * Load data type.
       *
       * @param databaseMetaData database meta data
       * @param databaseType database type
       * @return data type map
       * @throws SQLException SQL exception
       */
      public Map<String, Integer> load(final DatabaseMetaData databaseMetaData, final DatabaseType databaseType) throws SQLException {
          Map<String, Integer> result = loadStandardDataTypes(databaseMetaData);
          result.putAll(new DatabaseTypeRegistry(databaseType).getDialectDatabaseMetaData().getExtraDataTypes());
          return result;
      }
      
      private Map<String, Integer> loadStandardDataTypes(final DatabaseMetaData databaseMetaData) throws SQLException {
          Map<String, Integer> result = new CaseInsensitiveMap<>();
          try (ResultSet resultSet = databaseMetaData.getTypeInfo()) {
              while (resultSet.next()) {
                  result.put(resultSet.getString("TYPE_NAME"), resultSet.getInt("DATA_TYPE"));
              }
          }
          return result;
      }
  }