Customize declaration types

[sormuras]

Provide API to plug-in custom declaration like:

class CustomMethodDecl extends MethodDeclaration {
 // reflect
 // scan mirrors
 // store custom properties
 // emit custom listing
}

Usage outline:

register(MethodDeclaration.class, CustomMethodDecl.class);
...
InterfaceDeclaration interface = unit.declareInterface("Test");
CustomMethodDecl custom = interface.declareMethod(void.class, "run");

[sormuras]

import java.util.function.Supplier;

class Basic {}

class Complex extends Basic {}

class Default extends Factory<Basic> {

  public Default() {
    super(Basic::new);
  }

}

public class Factory<T extends Basic> {

  final Supplier<T> supplier;

  public Factory(Supplier<T> supplier) {
    this.supplier = supplier;
  }

  public static void main(String[] args) {
    Default Default = new Default();
    System.out.println(Default.supplier.get()); // Basic

    Factory<Complex> factory = new Factory<>(Complex::new);
    System.out.println(factory.supplier.get()); // Complex
  }

}