@startuml

abstract class Node { /' (also ConcreteObserver) '/
	+ setOutput(Net*)
	+ addInput(Net*)
	- inputs: Net*[]
	- output: Net*
	- type: static constexpr const string
	- minInputs: constexpr unsigned int
	- maxInputs: constexpr int
}
class Net { /' (also ConcreteSubject) '/
	- level: SignalLevel
	+ setLevel(SignalLevel)
	' only call notify when setLevel actually changes the level!!!!!!!
}

class Subject {
	- observers: Observer*[]
	+ attach(Observer*)
	+ detach(Observer*)
	+ notify()
}
interface Observer {
	+ update()
}

class GateAnd
class GateNand
class GateNor
class GateNot
class GateOr
class GateXor
class NodeOutput
class NodeInput

enum SignalLevel {
  LOW
	HIGH
	UNDEFINED
}

Node <|-[dashed]-- GateAnd
Node <|-[dashed]-- GateNand
Node <|-[dashed]-- GateNor
Node <|-[dashed]-- GateNot
Node <|-[dashed]-- GateOr
Node <|-[dashed]-- GateXor
Node <|-[dashed]-- NodeOutput
Node <|-[dashed]-- NodeInput

Subject <|-- Net
Observer <|-[dashed]- Node
Node -> "owner" Net
Observer "*" - Subject

class Parser {
	+ loadFromFile()
}

class CircuitFactory {
	+ run()
	+ configure()
}

class Circuit {
	+ createNode(string type, string label)
	+ createLink(string labelA, string labelB)

	- nets: Map<string label, Net*>
	- nodes: Map<string label, Node*>
}

CircuitFactory -[dashed]> Node
CircuitFactory <-[dashed]- Node


@enduml