/*
    *    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.io.StringReader;
  import java.sql.CallableStatement;
  import java.sql.Clob;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  /**
   * @author Clinton Begin
   */
  public class ClobTypeHandler extends BaseTypeHandler<String> {
  
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType)
        throws SQLException {
      StringReader reader = new StringReader(parameter);
      ps.setCharacterStream(i, reader, parameter.length());
    }
  
    @Override
    public String getNullableResult(ResultSet rs, String columnName)
        throws SQLException {
      Clob clob = rs.getClob(columnName);
      return toString(clob);
    }
  
    @Override
    public String getNullableResult(ResultSet rs, int columnIndex)
        throws SQLException {
      Clob clob = rs.getClob(columnIndex);
      return toString(clob);
    }
  
    @Override
    public String getNullableResult(CallableStatement cs, int columnIndex)
        throws SQLException {
      Clob clob = cs.getClob(columnIndex);
      return toString(clob);
    }
  
    private String toString(Clob clob) throws SQLException {
      return clob == null ? null : clob.getSubString(1, (int) clob.length());
    }
  
  }