BendDecorator

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

graph.decorator.bendDecorator.handleDecorator.setImplementation(
  new ConstantHandle()
)

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

graph.decorator.bendDecorator.handleDecorator.setImplementation(
  (bend) => bend.tag !== null,
  new ConstantHandle()
)

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

graph.decorator.bendDecorator.handleDecorator.setFactory(
  (bend) => new CustomHandle(bend)
)
graph.decorator.bendDecorator.handleDecorator.setFactory(
  (bend) => bend.tag !== null,
  (bend) => new CustomHandle(bend)
)

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

graph.decorator.bendDecorator.handleDecorator.setImplementationWrapper(
  (bend, original) => new HandleWrapper(bend, original)
)
graph.decorator.bendDecorator.handleDecorator.setImplementationWrapper(
  (bend) => bend.tag !== null,
  (bend, original) => new HandleWrapper(bend, original)
)graph.decorator.bendDecorator.handleDecorator.setImplementationWrapper(
  (bend, original) => new HandleWrapper(bend!, original)
)
graph.decorator.bendDecorator.handleDecorator.setImplementationWrapper(
  (bend) => bend.tag !== null,
  (bend, original) => new HandleWrapper(bend!, original)
)

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

graph.decorator.bendDecorator.handleDecorator.hideImplementation()
graph.decorator.bendDecorator.handleDecorator.hideImplementation(
  (bend) => bend.tag !== null
)

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

constructor() {}

/**
 * @param {!IGraph} graph
 */
registerLookup(graph) {
  this.chainLink = graph.decorator.bendDecorator.handleDecorator.setFactory(
    (bend) => new CustomHandle(bend)
  )
}

/**
 * @param {!IGraph} graph
 */
deregisterLookup(graph) {
  graph.decorator.bendDecorator.remove(this.chainLink)
}constructor() {}

registerLookup(graph: IGraph): void {
  this.chainLink = graph.decorator.bendDecorator.handleDecorator.setFactory(
    (bend) => new CustomHandle(bend)
  )!
}

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