[Architecture] introduce nodeBuilder concept

features/onboarding/src/main/kotlin/io/element/android/features/onboarding/api/OnBoardingEntryPoint.kt

@@ -16,10 +16,20 @@
 
 package io.element.android.features.onboarding.api
 
+import com.bumble.appyx.core.modality.BuildContext
+import com.bumble.appyx.core.node.Node
 import com.bumble.appyx.core.plugin.Plugin
 import io.element.android.libraries.architecture.FeatureEntryPoint
 
 interface OnBoardingEntryPoint : FeatureEntryPoint {
+
+    fun nodeBuilder(parentNode: Node, buildContext: BuildContext): NodeBuilder
+
+    interface NodeBuilder {
+        fun callback(callback: Callback): NodeBuilder
+        fun build(): Node
+    }
+
     interface Callback : Plugin {
         fun onSignUp()
         fun onSignIn()

features/onboarding/src/main/kotlin/io/element/android/features/onboarding/impl/DefaultOnBoardingEntryPoint.kt

@@ -27,7 +27,19 @@ import javax.inject.Inject
 
 @ContributesBinding(AppScope::class)
 class DefaultOnBoardingEntryPoint @Inject constructor() : OnBoardingEntryPoint {
-    override fun node(parentNode: Node, buildContext: BuildContext, plugins: List<Plugin>): Node {
-        return parentNode.createNode<OnBoardingNode>(buildContext, plugins)
+    override fun nodeBuilder(parentNode: Node, buildContext: BuildContext): OnBoardingEntryPoint.NodeBuilder {
+        return object : OnBoardingEntryPoint.NodeBuilder {
+
+            val plugins = ArrayList<Plugin>()
+
+            override fun callback(callback: OnBoardingEntryPoint.Callback): OnBoardingEntryPoint.NodeBuilder {
+                plugins += callback
+                return this
+            }
+
+            override fun build(): Node {
+                return parentNode.createNode<OnBoardingNode>(buildContext, plugins)
+            }
+        }
     }
 }