//sets the state of the message depending on the first letter of the header
//throws an exception when the header doesnt contain 9 numbers
//throws an exception when the header doesnt start with S, T or E
public void SetState()
{
Console.WriteLine(header[0]);
if (!header.ValidateNumbers())
{
throw new Exception("Header must be in the format S/T/E123456789!");
}
if (header[0].ToString().Equals("S"))
{
currentState = new SMSState(this);
}
else if (header[0].ToString().Equals("E"))
{
this.currentState = new EmailState(this);
}
else if (header[0].ToString().Equals("T"))
{
this.currentState = new TweetState(this);
}
else
{
throw new Exception("Invalid header.");
}
currentState.ProcessMessage();
}
//chained constructors, pass the actual message
public EmailState(MessageState state) : this(state.Message)
{
}
//chained constructor, set the actual message
public TweetState(MessageState state) : this(state.Message)
{
}
//chained constructor, pass the actual message
public SMSState(MessageState state) : this(state.Message)
{
}
