zuul0

src/de/szut/zuul/CommandWords.java

@@ -0,0 +1,43 @@
+package de.szut.zuul;
+
+/**
+ * This class is part of the "World of Zuul" application. 
+ * "World of Zuul" is a very simple, text based adventure game.  
+ * 
+ * This class holds an enumeration of all command words known to the game.
+ * It is used to recognise commands as they are typed in.
+ *
+ * @author  Michael Kölling and David J. Barnes
+ * @version 2016.02.29
+ */
+
+public class CommandWords
+{
+    // a constant array that holds all valid command words
+    private static final String[] validCommands = {
+        "go", "quit", "help"
+    };
+
+    /**
+     * Constructor - initialise the command words.
+     */
+    public CommandWords()
+    {
+        // nothing to do at the moment...
+    }
+
+    /**
+     * Check whether a given String is a valid command word. 
+     * @return true if a given string is a valid command,
+     * false if it isn't.
+     */
+    public boolean isCommand(String aString)
+    {
+        for(int i = 0; i < validCommands.length; i++) {
+            if(validCommands[i].equals(aString))
+                return true;
+        }
+        // if we get here, the string was not found in the commands
+        return false;
+    }
+}