/** * This class is part of the "World of Zuul" application. * "World of Zuul" is a very simple, text based adventure game. * * This class holds information about a command that was issued by the user. * A command currently consists of two parts: a CommandWord and a string * (for example, if the command was "take map", then the two parts * are TAKE and "map"). * * The way this is used is: Commands are already checked for being valid * command words. If the user entered an invalid command (a word that is not * known) then the CommandWord is UNKNOWN. * * If the command had only one word, then the second word is . * * @author Michael Kolling and David J. Barnes * @version 2006.03.30 */ public class Command { private CommandWord commandWord; private String secondWord; /** * Create a command object. First and second words must be supplied, but * the second may be null. * @param commandWord The CommandWord. UNKNOWN if the command word * was not recognised. * @param secondWord The second word of the command. May be null. */ public Command(CommandWord commandWord, String secondWord) { this.commandWord = commandWord; this.secondWord = secondWord; } /** * Return the command word (the first word) of this command. * @return The command word. */ public CommandWord getCommandWord() { return commandWord; } /** * @return The second word of this command. Returns null if there was no * second word. */ public String getSecondWord() { return secondWord; } /** * @return true if this command was not understood. */ public boolean isUnknown() { return (commandWord == CommandWord.UNKNOWN); } /** * @return true if the command has a second word. */ public boolean hasSecondWord() { return (secondWord != null); } }
