PortDecorator

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

graph.decorator.portDecorator.handleProviderDecorator.setImplementation(
  new ConstantHandleProvider()
)

setImplementation 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.portDecorator.handleProviderDecorator.setImplementation(
  (port) => port.tag !== null,
  new ConstantHandleProvider()
)

setFactory 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.portDecorator.handleProviderDecorator.setFactory(
  (port) => new CustomHandleProvider(port)
)
graph.decorator.portDecorator.handleProviderDecorator.setFactory(
  (port) => port.tag !== null,
  (port) => new CustomHandleProvider(port)
)

setImplementationWrapper 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.portDecorator.handleProviderDecorator.setImplementationWrapper(
  (port, original) => new HandleProviderWrapper(port, original)
)
graph.decorator.portDecorator.handleProviderDecorator.setImplementationWrapper(
  (port) => port.tag !== null,
  (port, original) => new HandleProviderWrapper(port, original)
)graph.decorator.portDecorator.handleProviderDecorator.setImplementationWrapper(
  (port, original) => new HandleProviderWrapper(port!, original)
)
graph.decorator.portDecorator.handleProviderDecorator.setImplementationWrapper(
  (port) => port.tag !== null,
  (port, original) => new HandleProviderWrapper(port!, original)
)

Finally hideImplementation 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.portDecorator.handleProviderDecorator.hideImplementation()
graph.decorator.portDecorator.handleProviderDecorator.hideImplementation(
  (port) => port.tag !== null
)

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

/**
 * @param {!IGraph} graph
 */
registerLookup(graph) {
  this.chainLink =
    graph.decorator.portDecorator.handleProviderDecorator.setFactory(
      (port) => new CustomHandleProvider(port)
    )
}

/**
 * @param {!IGraph} graph
 */
deregisterLookup(graph) {
  graph.decorator.portDecorator.remove(this.chainLink)
}registerLookup(graph: IGraph): void {
  this.chainLink =
    graph.decorator.portDecorator.handleProviderDecorator.setFactory(
      (port) => new CustomHandleProvider(port)
    )!
}

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