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Semester 1/Programming 1/Java/examples/projects/chapter08/zuul-with-enums-v2/Command.java

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+/**
+ * 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 <null>.
+ * 
+ * @author  Michael Kölling and David J. Barnes
+ * @version 2016.02.29
+ */
+
+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);
+    }
+}
+