added more doc to Timeline; added functionality to Bit

[Mograsim.git] / era.mi / src / era / mi / logic / Bit.java

diff --git a/era.mi/src/era/mi/logic/Bit.java b/era.mi/src/era/mi/logic/Bit.java
index e7c9396..804ecc9 100644 (file)
--- a/era.mi/src/era/mi/logic/Bit.java
+++ b/era.mi/src/era/mi/logic/Bit.java
@@ -1,5 +1,7 @@
 package era.mi.logic;
 
+import java.util.Arrays;
+
 public enum Bit
 {
        ONE, ZERO, Z, X;
@@ -41,9 +43,11 @@ public enum Bit
 
        public Bit xor(Bit other)
        {
-               // I'm uncertain how this should behave for cases where one value is neither 1 nor 0.
-               // TODO: Implement xor
-               return Bit.X;
+               if(this == Bit.X || this == Bit.Z
+                               || other == Bit.X || other == Bit.Z)
+                       return Bit.X;
+               else
+                       return this == other ? Bit.ZERO : Bit.ONE;
        }
 
        public Bit not()
@@ -58,6 +62,13 @@ public enum Bit
                                return Bit.X;
                        }
        }
+       
+       public Bit[] makeArray(int length)
+       {
+               Bit[] bits = new Bit[length];
+               Arrays.fill(bits, this);
+               return bits;
+       }
 
        /**
         * Rules for two bits that get directly connected<br>