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;
}