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   1 package net.mograsim.plugin.tables.memory;
   2
   3 import org.eclipse.jface.viewers.ILazyContentProvider;
   4 import org.eclipse.jface.viewers.TableViewer;
   5 import org.eclipse.jface.viewers.Viewer;
   6 import org.eclipse.swt.widgets.Display;
   7
   8 import net.mograsim.machine.MainMemory;
   9 import net.mograsim.machine.MemoryObserver;
  10
  11 public class MemoryTableContentProvider implements ILazyContentProvider, MemoryObserver
  12 {
  13         private long lower;
  14         private TableViewer viewer;
  15         private final static int limit = 10_000;
  16         private int amount = 0;
  17         private MainMemory memory;
  18
  19         public void setLowerBound(long lower)
  20         {
  21                 if (memory != null)
  22                         this.lower = Long.min(memory.getDefinition().getMaximalAddress(), Long.max(memory.getDefinition().getMinimalAddress(), lower));
  23                 else
  24                         this.lower = lower;
  25                 updateItemCount();
  26         }
  27
  28         public void updateItemCount()
  29         {
  30                 if (memory != null)
  31                 {
  32                         long size = memory.getDefinition().getMaximalAddress() - lower;
  33                         viewer.setItemCount(size > amount ? amount : (int) size);
  34                 } else
  35                         viewer.setItemCount(0);
  36         }
  37
  38         public long getLowerBound()
  39         {
  40                 return lower;
  41         }
  42
  43         public void setAmount(int amount)
  44         {
  45                 this.amount = Integer.min(amount, limit);
  46                 updateItemCount();
  47         }
  48
  49         public int getAmount()
  50         {
  51                 return amount;
  52         }
  53
  54         @Override
  55         public void updateElement(int index)
  56         {
  57                 long address = lower + index;
  58                 if (address <= memory.getDefinition().getMaximalAddress())
  59                         viewer.replace(new MemoryTableRow(address, memory), index);
  60         }
  61
  62         @Override
  63         public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  64         {
  65                 this.viewer = (TableViewer) viewer;
  66                 this.memory = (MainMemory) newInput;
  67                 if (oldInput != null)
  68                         ((MainMemory) oldInput).deregisterObserver(this);
  69                 if (memory != null)
  70                         memory.registerObserver(this);
  71                 setLowerBound(0L);
  72         }
  73
  74         @Override
  75         public void update(long address)
  76         {
  77                 Display.getDefault().asyncExec(() -> updateElement((int) (address - lower)));
  78         }
  79 }