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