plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/MachineContext.java

   1 package net.mograsim.plugin;
   2
   3 import java.util.HashSet;
   4 import java.util.Optional;
   5 import java.util.Set;
   6
   7 import net.mograsim.logic.model.am2900.machine.Am2900Machine;
   8 import net.mograsim.logic.model.am2900.machine.Am2900MachineDefinition;
   9 import net.mograsim.machine.Machine;
  10 import net.mograsim.machine.MachineRegistry;
  11
  12 public class MachineContext
  13 {
  14         private Machine machine;
  15         private Set<ContextObserver> observers;
  16         private static MachineContext instance;
  17
  18         private MachineContext()
  19         {
  20                 observers = new HashSet<>();
  21         }
  22
  23         public static MachineContext getInstance()
  24         {
  25                 if (instance == null)
  26                 {
  27                         instance = new MachineContext();
  28                         // TODO don't hardcode the Am2900
  29                         instance.setMachine(new Am2900Machine((Am2900MachineDefinition) MachineRegistry.getinstalledMachines().get("Am2900")));
  30                 }
  31                 return instance;
  32         }
  33
  34         public Machine getMachine()
  35         {
  36                 return machine;
  37         }
  38
  39         public void setMachine(Machine machine)
  40         {
  41                 this.machine = machine;
  42                 notifyObservers(machine);
  43         }
  44
  45         public void registerObserver(ContextObserver ob)
  46         {
  47                 observers.add(ob);
  48                 ob.setMachine(Optional.ofNullable(machine));
  49         }
  50
  51         public void deregisterObserver(ContextObserver ob)
  52         {
  53                 observers.remove(ob);
  54         }
  55
  56         private void notifyObservers(Machine machine)
  57         {
  58                 observers.forEach(ob -> ob.setMachine(Optional.ofNullable(machine)));
  59         }
  60
  61         @FunctionalInterface
  62         public static interface ContextObserver
  63         {
  64                 void setMachine(Optional<Machine> machine);
  65         }
  66 }