content: /*
   * Copyright (c) 2016, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.protocol.a;
  
  import com.mysql.cj.exceptions.ExceptionFactory;
  import com.mysql.cj.exceptions.WrongArgumentException;
  import com.mysql.cj.protocol.ColumnDefinition;
  import com.mysql.cj.protocol.ProtocolEntityFactory;
  import com.mysql.cj.result.DefaultColumnDefinition;
  import com.mysql.cj.result.Field;
  
  // We need to merge metadata from COM_STMT_PREPARE and COM_STMT_EXECUTE:
  // 1. some field flags do exist in metadata returned by COM_STMT_PREPARE but are missed after COM_STMT_EXECUTE
  // 2. COM_STMT_EXECUTE returns metadata with actual field data types, they may mismatch those from COM_STMT_PREPARE
  public class MergingColumnDefinitionFactory extends ColumnDefinitionFactory implements ProtocolEntityFactory<ColumnDefinition, NativePacketPayload> {
  
      public MergingColumnDefinitionFactory(long columnCount, ColumnDefinition columnDefinitionFromCache) {
          super(columnCount, columnDefinitionFromCache);
      }
  
      @Override
      public boolean mergeColumnDefinitions() {
          return true;
      }
  
      @Override
      public ColumnDefinition createFromFields(Field[] fields) {
          if (this.columnDefinitionFromCache != null) {
              if (fields.length != this.columnCount) {
                  throw ExceptionFactory.createException(WrongArgumentException.class, "Wrong number of ColumnDefinition fields.");
              }
              Field[] f = this.columnDefinitionFromCache.getFields();
              for (int i = 0; i < fields.length; i++) {
                  fields[i].setFlags(f[i].getFlags());
              }
          }
          return new DefaultColumnDefinition(fields);
      }
  }
  