package horstmann.ch02_mail;
import java.util.ArrayList;

/**
   A system of voice mail boxes.
 */
public class MailSystem
{
	/**
      Constructs a mail system with a given number of mailboxes
      @param mailboxCount the number of mailboxes
	 */
	public MailSystem(int mailboxCount)
	{
		mailboxes = new ArrayList<Mailbox>();

		// Initialize mail boxes.

		for (int i = 0; i < mailboxCount; i++)
		{
			String passcode = "" + (i + 1);
			String greeting = "You have reached mailbox " + (i + 1)
					+ ". \nPlease leave a message now.";
			mailboxes.add(new Mailbox(passcode, greeting));
		}
	}

	/**
      Locate a mailbox.
      @param ext the extension number
      @return the mailbox or null if not found
	 */
	public Mailbox findMailbox(String ext)
	{
		int i = Integer.parseInt(ext);
		if (1 <= i && i <= mailboxes.size())
			return  mailboxes.get(i - 1);
		else return null;
	}

	private ArrayList<Mailbox> mailboxes;
}