XA Binding ambiguous reference

[erikpowa]

Having interfaces (generated) like this

public interface IInterface3 : { void Close(); }
public interface IInterface2 : { void Close(); }
public interface IInterface1 : IInterface2, IInterface3 {}

The IInterface1 's invoker generated code with ambiguous reference:

static void n_Close (IntPtr jnienv, IntPtr native__this)
{
	global::IInterface1 __this = global::Java.Lang.Object.GetObject<global::IInterface1> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
	__this.Close (); // problem is here, it should be IInterface2 or IInterface3
}

There is two scenarios in this situation:

1. If both interface comes from MonoAndroid, you'll have no solution for this and have implement everything from scratch, manually.
2. One of the interfaces is generated, so you can just remove the specific member from the interface. (which is clearly a bad solution even if the interface implementation is private)

(ps renaming the Close would not help, since the generator will create 2 same named pointer to the method:

IntPtr id_close; // this is gonna be duplicated anyway
public unsafe void Close ()
{
	if (id_close == IntPtr.Zero)
		id_close = JNIEnv.GetMethodID (class_ref, "close", "()V");
	JNIEnv.CallVoidMethod (((global::Java.Lang.Object) this).Handle, id_close);
}

[mattleibow]

Why did you close this issue?

[mattleibow]

One workaround can be to add the close method to the interface using <add-node>.

[mattleibow]

Based on some discussion, it seems there is a bit more that might be ambiguous. For example, assume this C# class:

class Whatever : Java.Lang.Object, IInterface1, IInterface2, IInterface3 {
    void IInterface1.Close() { /* ... */}
    void IInterface2.Close() { /* ... */}
    void IInterface3.Close() { /* ... */}
}

Things will not work as expected. There is no guarantee which Java method will actually be invoked, when Java does a value.close() invocation! Or we might have errors in JNIEnv.RegisterJniNatives(). I’m 90% sure that’ll result in us re-registering close() 3 times. Will that error? Will it register the first function pointer? the last? ¯\_(ツ)_/¯
- @jonpryor