public bool IssueCommand(RFC1939.POPCommand command)
{
try
{
if (m_CurrentState.IssueCommand(command, this))
{
OnCommandIssued(this,
new CommandIssuedEventArgs(command));
return(true);
}
}
catch (RFC1939.POPException ex)
{
if (ex.InnerException != null)
{
if (ex.InnerException.InnerException != null)
{
if (ex.InnerException.InnerException is System.Net.Sockets.SocketException)
{
CloseConnection();
CurrentState = DisconnectedState.GetInstane();
return(false);
}
}
}
throw ex;
}
return(false);
}
public override bool IsLegalCommand(RFC1939.POPCommand command)
{
if (command is RFC1939.GreetingCommand)
{
return(true);
}
return(false);
}
internal void LoggCommand(RFC1939.POPCommand command)
{
if (m_CommandHistory.Count > m_MaxHistoryLenght)
{
m_CommandHistory.Dequeue();
}
m_CommandHistory.Enqueue(command);
}
/// <summary>
/// 执行命令，如果命令是与登录相关则不执行
/// </summary>
/// <returns>如果返回true,则说明命令执行成功</returns>
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
if (!IsLegalCommand(command))
{
return(false);
}
if (command is RFC1939.QuitCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = DisconnectedState.GetInstane();
return(true);
}
context.CurrentState = DisconnectedState.GetInstane();
context.LoggCommand(command);
}
else if (command is RFC1939.RetriveCommand || command is RFC1939.TopCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = ReadingState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.NoopCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
else
{
context.LoggCommand(command);
context.Disconnect();
context.CurrentState = DisconnectedState.GetInstane();
}
}
else
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
context.LoggCommand(command);
}
return(false);
}
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
if (IsLegalCommand(command))
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = AuthorizationState.GetInstance();
return(true);
}
}
return(false);
}
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
if (!IsLegalCommand(command))
{
return(false);
}
if (command is RFC1939.ConnectCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = TransactionState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.UserCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.PassCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = TransactionState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.QuitCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = DisconnectedState.GetInstane();
return(true);
}
context.LoggCommand(command);
}
return(false);
}
/// <summary>
/// 判断是不是与登录不相关的命令
/// </summary>
/// <returns>如果返回true,则说明命令是与登录不相关的命令</returns>
public override bool IsLegalCommand(RFC1939.POPCommand command)
{
if (command is RFC1939.UserCommand)
{
return(false);
}
if (command is RFC1939.PassCommand)
{
return(false);
}
if (command is RFC1939.ApopCommand)
{
return(false);
}
return(true);
}
public CommandIssuedEventArgs(RFC1939.POPCommand command)
{
m_Command = command;
}
/// <summary> /// 判断是不是合法命令 /// </summary> public abstract bool IsLegalCommand(RFC1939.POPCommand command);
/// <summary> /// 判断是不是合法命令，如果是则执行命令 /// </summary> public abstract bool IssueCommand(RFC1939.POPCommand command, POPClient context);
public override bool IsLegalCommand(RFC1939.POPCommand command)
{
return(false);
}
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
return(IsLegalCommand(command));
}
