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

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