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 java.io.IOException;
  import java.util.Optional;
  
  import com.mysql.cj.conf.PropertyKey;
  import com.mysql.cj.conf.PropertySet;
  import com.mysql.cj.conf.RuntimeProperty;
  import com.mysql.cj.protocol.ProtocolEntityFactory;
  import com.mysql.cj.protocol.ProtocolEntityReader;
  import com.mysql.cj.protocol.ResultsetRow;
  
  public class ResultsetRowReader implements ProtocolEntityReader<ResultsetRow, NativePacketPayload> {
  
      protected NativeProtocol protocol;
  
      protected PropertySet propertySet;
  
      protected RuntimeProperty<Integer> useBufferRowSizeThreshold;
  
      public ResultsetRowReader(NativeProtocol prot) {
          this.protocol = prot;
  
          this.propertySet = this.protocol.getPropertySet();
          this.useBufferRowSizeThreshold = this.propertySet.getMemorySizeProperty(PropertyKey.largeRowSizeThreshold);
      }
  
      /**
       * Retrieve one row from the MySQL server. Note: this method is not
       * thread-safe, but it is only called from methods that are guarded by
       * synchronizing on this object.
       * 
       * @param sf
       *            ProtocolEntityFactory
       * @throws IOException
       *             if an error occurs
       */
      @Override
      public ResultsetRow read(ProtocolEntityFactory<ResultsetRow, NativePacketPayload> sf) throws IOException {
          AbstractRowFactory rf = (AbstractRowFactory) sf;
          NativePacketPayload rowPacket = null;
          NativePacketHeader hdr = this.protocol.getPacketReader().readHeader();
  
          // read the entire packet(s)
          rowPacket = this.protocol.getPacketReader()
                  .readMessage(rf.canReuseRowPacketForBufferRow() ? Optional.ofNullable(this.protocol.getReusablePacket()) : Optional.empty(), hdr);
          this.protocol.checkErrorMessage(rowPacket);
          // Didn't read an error, so re-position to beginning of packet in order to read result set data
          rowPacket.setPosition(rowPacket.getPosition() - 1);
  
          // exit early with null if there's an EOF packet
          if (!this.protocol.getServerSession().isEOFDeprecated() && rowPacket.isEOFPacket()
                  || this.protocol.getServerSession().isEOFDeprecated() && rowPacket.isResultSetOKPacket()) {
              this.protocol.readServerStatusForResultSets(rowPacket, true);
              return null;
          }
  
          return sf.createFromMessage(rowPacket);
      }
  
  }
  