Added era.mi; Project containing provisional simulator core

[Mograsim.git] / era.mi / src / era / mi / logic / components / Merger2.java

diff --git a/era.mi/src/era/mi/logic/components/Merger2.java b/era.mi/src/era/mi/logic/components/Merger2.java
new file mode 100644 (file)
index 0000000..ca24254
--- /dev/null
+++ b/era.mi/src/era/mi/logic/components/Merger2.java
@@ -0,0 +1,70 @@
+package era.mi.logic.components;
+
+import era.mi.logic.WireArray;
+import era.mi.logic.WireArrayObserver;
+
+public class Merger2 implements WireArrayObserver
+{
+       private WireArray out;
+       private WireArray[] inputs;
+       private int[] beginningIndex;
+       
+       /**
+        * 
+        * @param union The output of merging n {@link WireArray}s into one. Must have length = a1.length() + a2.length() + ... + an.length().
+        * @param inputs The inputs to be merged into the union
+        */
+       public Merger2(WireArray union, WireArray... inputs)
+       {
+               this.inputs = inputs;
+               this.out = union;
+               this.beginningIndex = new int[inputs.length];
+               
+               int length = 0;
+               for(int i = 0; i < inputs.length; i++)
+               {
+                       beginningIndex[i] = length;
+                       length += inputs[i].length();
+                       inputs[i].addObserver(this);
+               }
+                       
+               if(length != union.length())
+                       throw new IllegalArgumentException("The output of merging n WireArrays into one must have length = a1.length() + a2.length() + ... + an.length().");
+       }
+
+       public WireArray getInput(int index)
+       {
+               return inputs[index];
+       }
+       
+       public WireArray getUnion()
+       {
+               return out;
+       }
+       
+       @Override
+       public void update(WireArray initiator)
+       {
+               int index = find(initiator);
+               int beginning = beginningIndex[index];
+               out.feedSignals(beginning, initiator.getValues());
+       }
+       
+       private int find(WireArray w)
+       {
+               for(int i = 0; i < inputs.length; i++)
+                       if(inputs[i] == w)
+                               return i;
+               return -1;
+       }
+
+       public WireArray getOut()
+       {
+               return out;
+       }
+
+       public WireArray[] getInputs()
+       {
+               return inputs.clone();
+       }
+}