73 lines
1.9 KiB
Java
Executable File
73 lines
1.9 KiB
Java
Executable File
/**
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* This class is part of the "World of Zuul" application.
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* "World of Zuul" is a very simple, text based adventure game.
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*
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* This class holds information about a command that was issued by the user.
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* A command currently consists of two parts: a CommandWord and a string
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* (for example, if the command was "take map", then the two parts
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* are TAKE and "map").
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*
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* The way this is used is: Commands are already checked for being valid
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* command words. If the user entered an invalid command (a word that is not
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* known) then the CommandWord is UNKNOWN.
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*
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* If the command had only one word, then the second word is <null>.
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*
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* @author Michael Kölling and David J. Barnes
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* @version 2016.02.29
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*/
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public class Command
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{
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private CommandWord commandWord;
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private String secondWord;
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/**
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* Create a command object. First and second words must be supplied, but
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* the second may be null.
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* @param commandWord The CommandWord. UNKNOWN if the command word
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* was not recognised.
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* @param secondWord The second word of the command. May be null.
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*/
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public Command(CommandWord commandWord, String secondWord)
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{
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this.commandWord = commandWord;
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this.secondWord = secondWord;
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}
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/**
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* Return the command word (the first word) of this command.
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* @return The command word.
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*/
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public CommandWord getCommandWord()
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{
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return commandWord;
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}
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/**
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* @return The second word of this command. Returns null if there was no
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* second word.
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*/
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public String getSecondWord()
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{
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return secondWord;
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}
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/**
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* @return true if this command was not understood.
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*/
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public boolean isUnknown()
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{
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return (commandWord == CommandWord.UNKNOWN);
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}
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/**
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* @return true if the command has a second word.
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*/
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public boolean hasSecondWord()
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{
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return (secondWord != null);
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}
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}
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