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
  25         public ManualSwitch(Timeline timeline, ReadWriteEnd output)
  26         {
  27                 super(timeline);
  28                 observers = new ArrayList<>();
  29                 if (output.length() != 1)
  30                         throw new IllegalArgumentException("Switch output can be only a single wire");
  31                 this.output = output;
  32         }
  33
  34         public void switchOn()
  35         {
  36                 setState(true);
  37         }
  38
  39         public void switchOff()
  40         {
  41                 setState(false);
  42         }
  43
  44         public void toggle()
  45         {
  46                 setState(!isOn());
  47         }
  48
  49         public void setState(boolean isOn)
  50         {
  51                 setToValueOf(isOn ? Bit.ONE : Bit.ZERO);
  52         }
  53
  54         public void setToValueOf(Bit bit)
  55         {
  56                 if (!bit.isBinary())
  57                         throw new IllegalArgumentException("Cannot set ManualSwitch to the value of Bit " + bit);
  58                 if (bit == output.getInputValue())
  59                         return;
  60                 output.feedSignals(bit);
  61                 notifyObservers();
  62         }
  63
  64         public boolean isOn()
  65         {
  66                 return output.getInputValue() == Bit.ONE;
  67         }
  68
  69         public Bit getValue()
  70         {
  71                 return output.getInputValue();
  72         }
  73
  74         @Override
  75         public List<ReadEnd> getAllInputs()
  76         {
  77                 return List.of();
  78         }
  79
  80         @Override
  81         public List<ReadWriteEnd> getAllOutputs()
  82         {
  83                 return List.of(output);
  84         }
  85
  86         @Override
  87         public void registerObserver(LogicObserver ob)
  88         {
  89                 observers.add(ob);
  90         }
  91
  92         @Override
  93         public void deregisterObserver(LogicObserver ob)
  94         {
  95                 observers.remove(ob);
  96         }
  97
  98         @Override
  99         public void notifyObservers()
 100         {
 101                 observers.forEach(ob -> ob.update(this));
 102         }
 103
 104 }