net.mograsim.machine/src/net/mograsim/machine/mi/StandardMicroprogramMemory.java

   1 package net.mograsim.machine.mi;
   2
   3 import java.util.HashSet;
   4
   5 import net.mograsim.machine.MemoryDefinition;
   6 import net.mograsim.machine.MemoryObserver;
   7 import net.mograsim.machine.standard.memory.MemoryException;
   8
   9 class StandardMicroprogramMemory implements MicroprogramMemory
  10 {
  11         private MicroInstruction[] data;
  12         private MemoryDefinition definition;
  13         private HashSet<MemoryObserver> observers;
  14
  15         StandardMicroprogramMemory(MemoryDefinition definition)
  16         {
  17                 if(definition.size() > Integer.MAX_VALUE)
  18                         throw new MemoryException("Size of MicroprogramMemory must be an int, not a long");
  19                 this.definition = definition;
  20                 data = new MicroInstruction[(int) definition.size()];
  21         }
  22
  23         private int translate(long address)
  24         {
  25                 return (int) (address - definition.getMinimalAddress());
  26         }
  27
  28         @Override
  29         public MicroInstruction getCell(long address)
  30         {
  31                 return data[translate(address)];
  32         }
  33
  34         @Override
  35         public void setCell(long address, MicroInstruction data)
  36         {
  37                 this.data[translate(address)] = data;
  38         }
  39
  40         @Override
  41         public void registerObserver(MemoryObserver ob)
  42         {
  43                 observers.add(ob);
  44         }
  45
  46         @Override
  47         public void deregisterObserver(MemoryObserver ob)
  48         {
  49                 observers.remove(ob);
  50         }
  51
  52         @Override
  53         public void notifyObservers(long address)
  54         {
  55                 observers.forEach(ob -> ob.update(address));
  56         }
  57
  58         @Override
  59         public MemoryDefinition getDefinition()
  60         {
  61                 return definition;
  62         }
  63
  64 }