public enum Commands
{
	go, quit, help, charge, fire, search, take, UNKNOWN;
	/**
	 * Check if the command is available for the player
	 * @param player
	 * @return
	 */
	public boolean isAvailableTo(Player player)
	{
		switch(this)
		{
			case UNKNOWN:
				return false;
			case charge:
			case fire:
				return player.hasItem("Beamer");
			default:
				return true;
		}
	}
    /**
     * Check whether a given String is a valid command word.
     * @return true if it is, false if it isn't.
     */
    public boolean isCommand(String aString)
    {
        for(Commands com : Commands.values())
        {
            if(com.toString().equals(aString))
                return true;
        }
        // if we get here, the string was not found in the commands
        return false;
    }

    /**
     * Print all valid commands to System.out.
     * @param player the player which commands shall be shown
     */
    public void showAll(Player player)
    {
        for(Commands command: Commands.values())
        {
        	if(command.isAvailableTo(player))
        		System.out.print(command + "  ");
        }
        System.out.println();
    }
}