net.mograsim.logic.core/src/net/mograsim/logic/core/components/ManualSwitch.java

   1 package net.mograsim.logic.core.components;
   2
   3 import java.util.ArrayList;
   4 import java.util.Collection;
   5 import java.util.List;
   6
   7 import net.mograsim.logic.core.LogicObservable;
   8 import net.mograsim.logic.core.LogicObserver;
   9 import net.mograsim.logic.core.timeline.Timeline;
  10 import net.mograsim.logic.core.types.Bit;
  11 import net.mograsim.logic.core.wires.Wire.ReadEnd;
  12 import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
  13
  14 /**
  15  * This class models a simple on/off (ONE/ZERO) switch for user interaction.
  16  *
  17  * @author Christian Femers
  18  *
  19  */
  20 public class ManualSwitch extends Component implements LogicObservable
  21 {
  22         private Collection<LogicObserver> observers;
  23         private ReadWriteEnd output;
  24         private boolean isOn;
  25
  26         public ManualSwitch(Timeline timeline, ReadWriteEnd output)
  27         {
  28                 super(timeline);
  29                 observers = new ArrayList<>();
  30                 if (output.length() != 1)
  31                         throw new IllegalArgumentException("Switch output can be only a single wire");
  32                 this.output = output;
  33         }
  34
  35         public void switchOn()
  36         {
  37                 setState(true);
  38         }
  39
  40         public void switchOff()
  41         {
  42                 setState(false);
  43         }
  44
  45         public void toggle()
  46         {
  47                 setState(!isOn);
  48         }
  49
  50         public void setState(boolean isOn)
  51         {
  52                 if (this.isOn == isOn)
  53                         return;
  54                 this.isOn = isOn;
  55                 output.feedSignals(getValue());
  56                 notifyObservers();
  57         }
  58
  59         public boolean isOn()
  60         {
  61                 return isOn;
  62         }
  63
  64         public Bit getValue()
  65         {
  66                 return isOn ? Bit.ONE : Bit.ZERO;
  67         }
  68
  69         @Override
  70         public List<ReadEnd> getAllInputs()
  71         {
  72                 return List.of();
  73         }
  74
  75         @Override
  76         public List<ReadWriteEnd> getAllOutputs()
  77         {
  78                 return List.of(output);
  79         }
  80
  81         @Override
  82         public void registerObserver(LogicObserver ob)
  83         {
  84                 observers.add(ob);
  85         }
  86
  87         @Override
  88         public void deregisterObserver(LogicObserver ob)
  89         {
  90                 observers.remove(ob);
  91         }
  92
  93         @Override
  94         public void notifyObservers()
  95         {
  96                 observers.forEach(ob -> ob.update(this));
  97         }
  98
  99 }