PortDecorator

The port can be decorated in various ways. addConstant decorates the port's lookup to return the same instance for each port.

graph.decorator.ports.handleProvider.addConstant(
  new ConstantHandleProvider(),
)

addConstant with a predicate decorates the port's lookup only to return the same instance for each port for which the predicate returns true.

graph.decorator.ports.handleProvider.addConstant(
  (port) => port.tag !== null,
  new ConstantHandleProvider(),
)

addFactory calls the provided factory method to return a new instance of the queried type created for the given port or for ports for which the predicate returns true, respectively:

graph.decorator.ports.handleProvider.addFactory(
  (port) => new CustomHandleProvider(port),
)
graph.decorator.ports.handleProvider.addFactory(
  (port) => port.tag !== null,
  (port) => new CustomHandleProvider(port),
)

addWrapperFactory calls the provided factory method to return a new instance of the queried type which wraps the default implementation, once for all ports and once only for ports for which the predicate returns true.

graph.decorator.ports.handleProvider.addWrapperFactory(
  (port, original) => new HandleProviderWrapper(port!, original),
)
graph.decorator.ports.handleProvider.addWrapperFactory(
  (port) => port.tag !== null,
  (port, original) => new HandleProviderWrapper(port!, original),
)

Finally hide hides the default implementation by letting the lookup always return null for all ports and for ports for which the predicate returns true, respectively

graph.decorator.ports.handleProvider.hide()
graph.decorator.ports.handleProvider.hide((port) => port.tag !== null)

Each of these methods returns a IContextLookupChainLink which can be used to remove the modified behavior again:

registerLookup(graph: IGraph): void {
  this.chainLink = graph.decorator.ports.handleProvider.addFactory(
    (port) => new CustomHandleProvider(port),
  )!
}

deregisterLookup(graph: IGraph): void {
  graph.decorator.ports.remove(this.chainLink)
}