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// retains the right to make changes to this source code at
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package bcexchanger.ui;

import java.util.Enumeration;
import java.util.Vector;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;

import bcexchanger.*;

/**
 * 
 * This class implements the service list screen. This screen is used
 * to when several services are available in vicinity and allows user
 * to choose the desired one. Using this screen user can select the
 * service or cancel the processs
 * 
 * The class is extending an example.BCExchanger.ui.Screen class
 * 
 * @version 1.0 29.09.2005
 * @see example.BCExchanger.ui.Screen Design patterns: State
 * 
 */
public class ServiceListScreen extends Screen {

  private List list;
  private Command okCommand;
  private Command cancelCommand;

  /**
   * Constructor
   * 
   * @param _midlet -
   *          the parent class which keeps the current UI state
   * @param friendlyNames -
   *          vector of the friednly names of the devices which
   *          contain the services
   */
  public ServiceListScreen(BCExchangerMIDlet _midlet,
      Vector friendlyNames) {
    super(_midlet);

    list = new List("Choose service", Choice.EXCLUSIVE);

    if (friendlyNames.isEmpty()) {
      // list should not be empty
      throw new RuntimeException("Internal error #23");
    }

    Enumeration e = friendlyNames.elements();

    while (e.hasMoreElements()) {
      list.append((String) e.nextElement(), null);
    }

    okCommand = new Command("Ok", Command.OK, 1);
    cancelCommand = new Command("Cancel", Command.CANCEL, 1);

    list.addCommand(okCommand);
    list.addCommand(cancelCommand);

    list.setCommandListener(this);

    displayable = list;
  }

  public void commandAction(Command command, Displayable _displayable) {
    if (_displayable != list) {
      // wrong displayable
      throw new RuntimeException("Internal error #24");
    }

    if (command == okCommand) {
      midlet.serviceSelected(list.getSelectedIndex());
      midlet.unblock();
    } else if (command == cancelCommand) {
      midlet.getExchanger().cancelSending();
      midlet.unblock();
    } else {
      // unknown command
      throw new RuntimeException("Internal error #25");
    }

  }
}