content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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 com.alibaba.cobar.net.mysql;
  
  import java.nio.ByteBuffer;
  
  import com.alibaba.cobar.mysql.BufferUtil;
  import com.alibaba.cobar.mysql.MySQLMessage;
  import com.alibaba.cobar.net.FrontendConnection;
  
  /**
   * From Server To Client, at the end of a series of Field Packets, and at the
   * end of a series of Data Packets.With prepared statements, EOF Packet can also
   * end parameter information, which we'll describe later.
   * 
   * <pre>
   * Bytes                 Name
   * -----                 ----
   * 1                     field_count, always = 0xfe
   * 2                     warning_count
   * 2                     Status Flags
   * 
   * @see http://forge.mysql.com/wiki/MySQL_Internals_ClientServer_Protocol#EOF_Packet
   * </pre>
   * 
   * @author xianmao.hexm 2010-7-16 上午10:55:53
   */
  public class EOFPacket extends MySQLPacket {
      public static final byte FIELD_COUNT = (byte) 0xfe;
  
      public byte fieldCount = FIELD_COUNT;
      public int warningCount;
      public int status = 2;
  
      public void read(byte[] data) {
          MySQLMessage mm = new MySQLMessage(data);
          packetLength = mm.readUB3();
          packetId = mm.read();
          fieldCount = mm.read();
          warningCount = mm.readUB2();
          status = mm.readUB2();
      }
  
      @Override
      public ByteBuffer write(ByteBuffer buffer, FrontendConnection c) {
          int size = calcPacketSize();
          buffer = c.checkWriteBuffer(buffer, c.getPacketHeaderSize() + size);
          BufferUtil.writeUB3(buffer, size);
          buffer.put(packetId);
          buffer.put(fieldCount);
          BufferUtil.writeUB2(buffer, warningCount);
          BufferUtil.writeUB2(buffer, status);
          return buffer;
      }
  
      @Override
      public int calcPacketSize() {
          return 5;// 1+2+2;
      }
  
      @Override
      protected String getPacketInfo() {
          return "MySQL EOF Packet";
      }
  
  }
  