| Package | com.yworks.support |
| Interface | public interface ILookup |
| Implementors | AbstractStyleRenderer, CallbackLookup, CanvasComponent, DefaultItemLookup, GraphMLContext, TemplateStyleDataContext |
The lookup idiom allows for dynamically providing, adding, changing, and removing implementation aspects of an instance that would not be possible to achieve using ordinary object oriented methods.
| Method | Defined By | ||
|---|---|---|---|
lookup(type:Class):Object
Returns an instance that implements the given type or null. | ILookup | ||
| lookup | () | method |
public function lookup(type:Class):Object
Returns an instance that implements the given type or null.
Typically, this method will be called in order to obtain a different view or
aspect of the current instance. This is quite similar to casting or using
a super type or interface of this instance, but is not limited to inheritance or
compile time constraints. An instance implementing this method is not
required to return non-null implementations for the types, nor does it
have to return the same instance any time. Also it depends on the
type and context whether the instance returned stays up to date or needs to
be reobtained for subsequent use.
Parameters
type:Class — the type for which an instance shall be returned
|
Object — an instance that is assignable to type or null
|