Have common builder

Here is a code sample of what I am trying to do:

var shutterBuilder = Shutter.with(this)

if (useCamera) shutterBuilder = shutterBuilder.takePhoto().usePrivateAppExternalStorage()
else shutterBuilder = shutterBuilder.getPhotoFromGallery()

shutterResult = shutterBuilder
.snap(object : ShutterResultCallback {

I am trying to dynamically choose what builder I use. Depending on boolean variable useCamera.

Problem is I cannot do this because the builder objects being returned from each are not common.

What I could do:

1. add a function build() that builds to a common object that you can then call snap() on.
2. Will a kotlin DSL allow me to solve this problem from a different angle?

Start at the Shutter.with(this) entry point and compare the builder types returned by takePhoto().usePrivateAppExternalStorage() and getPhotoFromGallery(). Define what a common result should expose for the subsequent snap call, then verify the proposed API against both branches shown in the issue.