logic gates and, or and xor now take an arbitrary amount of inputs.

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

diff --git a/era.mi/src/era/mi/logic/components/gates/MultiInputGate.java b/era.mi/src/era/mi/logic/components/gates/MultiInputGate.java
new file mode 100644 (file)
index 0000000..b85939e
--- /dev/null
+++ b/era.mi/src/era/mi/logic/components/gates/MultiInputGate.java
@@ -0,0 +1,63 @@
+package era.mi.logic.components.gates;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import era.mi.logic.Bit;
+import era.mi.logic.components.BasicComponent;
+import era.mi.logic.wires.WireArray;
+import era.mi.logic.wires.WireArray.WireArrayInput;
+
+public abstract class MultiInputGate extends BasicComponent
+{
+       protected WireArray[] in;
+       protected WireArray out;
+       protected WireArrayInput outI;
+       protected final int length;
+       protected Operation op;
+       
+       protected MultiInputGate(int processTime, Operation op, WireArray out, WireArray... in)
+       {
+               super(processTime);
+               this.op = op;
+               length = out.length;
+               this.in = in.clone();
+               if(in.length < 1)
+                       throw new IllegalArgumentException(String.format("Cannot create gate with %d wires.", in.length));
+               for(WireArray w : in)
+               {
+                       if(w.length != length)
+                               throw new IllegalArgumentException("All wires connected to the gate must be of uniform length.");
+                       w.addObserver(this);
+               }
+               this.out = out;
+               outI = out.createInput();
+       }
+
+
+       @Override
+       public List<WireArray> getAllInputs()
+       {
+               return Collections.unmodifiableList(Arrays.asList(in));
+       }
+
+       @Override
+       public List<WireArray> getAllOutputs()
+       {
+               return Collections.unmodifiableList(Arrays.asList(out));
+       }
+       
+       protected void compute()
+       {
+               Bit[] result = in[0].getValues();
+               for(int i = 1; i < in.length; i++)
+                       result = op.execute(result, in[i].getValues());
+               outI.feedSignals(result);
+       }
+       
+       protected interface Operation
+       {
+               public Bit[] execute(Bit[] a, Bit[] b);
+       }
+}