[sidepelican]

Problem

When a protocol is used as a parameter, jextract generates a wrapper class in Swift. The wrapper class name is based on the original Swift function signature, but the code that uses the wrapper refers to it by a name based on the Java method name.

This causes a naming mismatch in cases such as the following:

// Original
public protocol Animal {
  public func bark()
}

public struct Owner {
  public var animal: any Animal
}

// Generated

// Protocol parameter wrapper
final class _Owner_animal_newValue_Wrapper: SwiftJavaAnimalWrapper {
  ...
}

// Setter implementation
public func Java_com_example_swift_Owner__00024setAnimal__Ljava_lang_Object_2J(environment: UnsafeMutablePointer<JNIEnv?>!, thisClass: jclass, newValue: jobject?, selfPointer: jlong) {
  ...
  newValueswiftObject$ = _Owner_setAnimal_newValue_Wrapper(_javaAnimalInterface: JavaAnimal(javaThis: newValue!, environment: environment))
  // ❌ Inconsistent wrapper name
  ...
}

Solution

Use the Java-translated function signature when generating the wrapper class name, so that the declaration and its references use the same name.

Fixes #949

[ktoso]

Thanks! Sorry for slow reviews, I'm on holiday this week