/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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 org.apache.ibatis.type;
  
  import java.sql.CallableStatement;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  /**
   * @author Clinton Begin
   */
  public class EnumTypeHandler<E extends Enum<E>> extends BaseTypeHandler<E> {
  
    private final Class<E> type;
  
    public EnumTypeHandler(Class<E> type) {
      if (type == null) {
        throw new IllegalArgumentException("Type argument cannot be null");
      }
      this.type = type;
    }
  
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException {
      if (jdbcType == null) {
        ps.setString(i, parameter.name());
      } else {
        ps.setObject(i, parameter.name(), jdbcType.TYPE_CODE); // see r3589
      }
    }
  
    @Override
    public E getNullableResult(ResultSet rs, String columnName) throws SQLException {
      String s = rs.getString(columnName);
      return s == null ? null : Enum.valueOf(type, s);
    }
  
    @Override
    public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
      String s = rs.getString(columnIndex);
      return s == null ? null : Enum.valueOf(type, s);
    }
  
    @Override
    public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
      String s = cs.getString(columnIndex);
      return s == null ? null : Enum.valueOf(type, s);
    }
  }