Hi,
I have looked at Scala support lately because I have implemented the
same TraitMixin (class that do all magic) for Kotlin[1] language.
I have extended TraitMixin to support @This injection and private
mixins. Currently looking at @State injection. All was possible
without adding Fragment SPI, but adding such spi could allow nicer
syntax ( at least for Kotlin ).
Here is example how it look in Kotlin:
[1] www.jetbrains.com/kotlin
trait TestEntity: EntityComposite, Commands, Events, Data {
}
// interface + mixin
trait Commands {
// [This] is supported lazy via getEvents() implemented by TraitMixin
protected var events: Events
[`This`] private set
[`This`] get
// [Service] is supported lazy, implemented by TraitMixin
[Service]
fun testService(): TestService;
fun updateFoo(newValue: String)
{
// Call "injected" service
val repeated = testService().repeat(newValue);
events.updatedFoo(repeated)
}
}
trait Data {
[UseDefaults]
fun foo(): Property<String>
}
[Mixins( javaClass<SupportMixin>() )]
trait Events
{
fun updatedFoo(newValue: String)
}
trait Nameable {
[UseDefaults]
fun name(): Property<String>
}
abstract class SupportMixin: Events {
// here [This} is also lazy via getNameable() as Kotlin generates
get/set methiods
// Nameable is private mixin and here is line from TraitMixin
// return ((CompositeInstance)Proxy.getInvocationHandler(
composite )).newProxy( method.getReturnType() );
[`This`]
private var nameable: Nameable? = null
[`This`]
private var data: Data? = null
override fun updatedFoo(newValue: String)
{
// Kotlin support for null-safety requires !! notation
data!!.foo().set( newValue)
}
}
- Tibor
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