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using System;
namespace DesignPatterns.State {
internal class ProcessingTransactionState : IState {
public ProcessingTransactionState( IPosTerminal terminal ) {
_terminal = terminal;
}
public void ProcessTransaction( ) {
if ( (++_counter % 5) == 0 ) {
_terminal.CurrentState = new TransactionRejectedState( _terminal );
}
else {
_terminal.CurrentState = new TransactionApprovedState( _terminal );
}
}
public void PrintReceipt( ) {
Console.Out.WriteLine( "The transaction needs to be processed first" );
}
public void SwipeCard( string cardNumber ) {
Console.Out.WriteLine( "You have already swiped a card" );
}
public void EnterAmount( double amount ) {
Console.Out.WriteLine( "You have already entered an amount" );
}
public void EnterPin( string pin ) {
Console.Out.WriteLine( "You have already entered a PIN" );
}
private readonly IPosTerminal _terminal;
private static int _counter;
}
}
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