era.mi/src/era/mi/logic/components/gates/MultiInputGate.java

   1 package era.mi.logic.components.gates;
   2
   3 import java.util.Arrays;
   4 import java.util.Collections;
   5 import java.util.List;
   6
   7 import era.mi.logic.Bit;
   8 import era.mi.logic.components.BasicComponent;
   9 import era.mi.logic.wires.WireArray;
  10 import era.mi.logic.wires.WireArray.WireArrayEnd;
  11
  12 public abstract class MultiInputGate extends BasicComponent
  13 {
  14         protected WireArray[] in;
  15         protected WireArray out;
  16         protected WireArrayEnd outI;
  17         protected final int length;
  18         protected Operation op;
  19
  20         protected MultiInputGate(int processTime, Operation op, WireArray out, WireArray... in)
  21         {
  22                 super(processTime);
  23                 this.op = op;
  24                 length = out.length;
  25                 this.in = in.clone();
  26                 if (in.length < 1)
  27                         throw new IllegalArgumentException(String.format("Cannot create gate with %d wires.", in.length));
  28                 for (WireArray w : in)
  29                 {
  30                         if (w.length != length)
  31                                 throw new IllegalArgumentException("All wires connected to the gate must be of uniform length.");
  32                         w.addObserver(this);
  33                 }
  34                 this.out = out;
  35                 outI = out.createInput();
  36         }
  37
  38         @Override
  39         public List<WireArray> getAllInputs()
  40         {
  41                 return Collections.unmodifiableList(Arrays.asList(in));
  42         }
  43
  44         @Override
  45         public List<WireArray> getAllOutputs()
  46         {
  47                 return Collections.unmodifiableList(Arrays.asList(out));
  48         }
  49
  50         protected void compute()
  51         {
  52                 Bit[] result = in[0].getValues();
  53                 for (int i = 1; i < in.length; i++)
  54                         result = op.execute(result, in[i].getValues());
  55                 outI.feedSignals(result);
  56         }
  57
  58         protected interface Operation
  59         {
  60                 public Bit[] execute(Bit[] a, Bit[] b);
  61         }
  62 }