era.mi/src/era/mi/logic/components/Merger2.java

   1 package era.mi.logic.components;
   2
   3 import era.mi.logic.WireArray;
   4 import era.mi.logic.WireArrayObserver;
   5
   6 public class Merger2 implements WireArrayObserver
   7 {
   8         private WireArray out;
   9         private WireArray[] inputs;
  10         private int[] beginningIndex;
  11
  12         /**
  13          *
  14          * @param union The output of merging n {@link WireArray}s into one. Must have length = a1.length() + a2.length() + ... + an.length().
  15          * @param inputs The inputs to be merged into the union
  16          */
  17         public Merger2(WireArray union, WireArray... inputs)
  18         {
  19                 this.inputs = inputs;
  20                 this.out = union;
  21                 this.beginningIndex = new int[inputs.length];
  22
  23                 int length = 0;
  24                 for(int i = 0; i < inputs.length; i++)
  25                 {
  26                         beginningIndex[i] = length;
  27                         length += inputs[i].length();
  28                         inputs[i].addObserver(this);
  29                 }
  30
  31                 if(length != union.length())
  32                         throw new IllegalArgumentException("The output of merging n WireArrays into one must have length = a1.length() + a2.length() + ... + an.length().");
  33         }
  34
  35         public WireArray getInput(int index)
  36         {
  37                 return inputs[index];
  38         }
  39
  40         public WireArray getUnion()
  41         {
  42                 return out;
  43         }
  44
  45         @Override
  46         public void update(WireArray initiator)
  47         {
  48                 int index = find(initiator);
  49                 int beginning = beginningIndex[index];
  50                 out.feedSignals(beginning, initiator.getValues());
  51         }
  52
  53         private int find(WireArray w)
  54         {
  55                 for(int i = 0; i < inputs.length; i++)
  56                         if(inputs[i] == w)
  57                                 return i;
  58                 return -1;
  59         }
  60
  61         public WireArray getOut()
  62         {
  63                 return out;
  64         }
  65
  66         public WireArray[] getInputs()
  67         {
  68                 return inputs.clone();
  69         }
  70 }