Better propagate nullability for AttributeSet (#86)

These can be nullable everywhere except layout/xml inflation

Author: ZacSweers

viewpump/src/main/java/io/github/inflationx/viewpump/FallbackViewCreator.kt

@@ -5,5 +5,5 @@ import android.util.AttributeSet
 import android.view.View
 
 fun interface FallbackViewCreator {
-  fun onCreateView(parent: View?, name: String, context: Context, attrs: AttributeSet): View?
+  fun onCreateView(parent: View?, name: String, context: Context, attrs: AttributeSet?): View?
 }

viewpump/src/main/java/io/github/inflationx/viewpump/InflateRequest.kt

@@ -10,7 +10,7 @@ data class InflateRequest(
     @get:JvmName("context")
     val context: Context,
     @get:JvmName("attrs")
-    val attrs: AttributeSet,
+    val attrs: AttributeSet? = null,
     @get:JvmName("parent")
     val parent: View? = null,
     @get:JvmName("fallbackViewCreator")
@@ -61,7 +61,7 @@ data class InflateRequest(
     fun build() =
         InflateRequest(name = name ?: throw IllegalStateException("name == null"),
             context = context ?: throw IllegalStateException("context == null"),
-            attrs = attrs ?: throw IllegalStateException("attrs == null"),
+            attrs = attrs,
             parent = parent,
             fallbackViewCreator = fallbackViewCreator ?: throw IllegalStateException("fallbackViewCreator == null")
         )

viewpump/src/main/java/io/github/inflationx/viewpump/ViewPump.kt

@@ -44,7 +44,7 @@ class ViewPump private constructor(
    * @param clazz The class of View to be created.
    * @return The processed view, which might not necessarily be the same type as clazz.
    */
-  fun create(context: Context, clazz: Class<out View>, attrs: AttributeSet): View? {
+  fun create(context: Context, clazz: Class<out View>, attrs: AttributeSet?): View? {
     return inflate(InflateRequest(
         context = context,
         name = clazz.name,
@@ -204,7 +204,7 @@ class ViewPump private constructor(
     @Deprecated("Global singletons are bad for testing, scoping, and composition. Use local ViewPump instances instead.")
     @JvmName("staticCreateDeprecated")
     @JvmStatic
-    fun create(context: Context, clazz: Class<out View>, attrs: AttributeSet): View? {
+    fun create(context: Context, clazz: Class<out View>, attrs: AttributeSet?): View? {
       @Suppress("DEPRECATION_ERROR")
       return get()
         .inflate(InflateRequest(

viewpump/src/main/java/io/github/inflationx/viewpump/internal/-ReflectiveFallbackViewCreator.kt

@@ -17,7 +17,7 @@ internal class `-ReflectiveFallbackViewCreator` : FallbackViewCreator {
   }
 
   override fun onCreateView(parent: View?, name: String, context: Context,
-      attrs: AttributeSet): View? {
+      attrs: AttributeSet?): View? {
     try {
       val clazz = Class.forName(name).asSubclass(View::class.java)
       var constructor: Constructor<out View>

viewpump/src/main/java/io/github/inflationx/viewpump/internal/-ViewPumpActivityFactory.kt

@@ -35,5 +35,5 @@ internal interface `-ViewPumpActivityFactory` {
    * @see android.view.LayoutInflater.Factory2
    */
   fun onActivityCreateView(parent: View?, view: View, name: String, context: Context,
-      attrs: AttributeSet): View?
+      attrs: AttributeSet?): View?
 }

viewpump/src/main/java/io/github/inflationx/viewpump/internal/-ViewPumpLayoutInflater.kt

@@ -40,7 +40,6 @@ internal class `-ViewPumpLayoutInflater`(
         setUpLayoutFactories(cloned)
     }
 
-
     /**
      * We use this for internal cloning to be a little more efficient with memory.
      */
@@ -147,7 +146,7 @@ internal class `-ViewPumpLayoutInflater`(
         view: View,
         name: String,
         context: Context,
-        attrs: AttributeSet
+        attrs: AttributeSet?
     ): View? {
         return viewPump
             .inflate(
@@ -169,7 +168,7 @@ internal class `-ViewPumpLayoutInflater`(
      * BUT only for none CustomViews.
      */
     @Throws(ClassNotFoundException::class)
-    override fun onCreateView(parent: View?, name: String, attrs: AttributeSet): View? {
+    override fun onCreateView(parent: View?, name: String, attrs: AttributeSet?): View? {
         return viewPump
             .inflate(
                 InflateRequest(
@@ -189,7 +188,7 @@ internal class `-ViewPumpLayoutInflater`(
      * Basically if this method doesn't inflate the View nothing probably will.
      */
     @Throws(ClassNotFoundException::class)
-    override fun onCreateView(name: String, attrs: AttributeSet): View? {
+    override fun onCreateView(name: String, attrs: AttributeSet?): View? {
         return viewPump
             .inflate(
                 InflateRequest(
@@ -284,7 +283,7 @@ internal class `-ViewPumpLayoutInflater`(
             parent: View?,
             name: String,
             context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
             return inflater.createCustomViewInternal(view, name, context, attrs)
         }
@@ -296,7 +295,7 @@ internal class `-ViewPumpLayoutInflater`(
 
         override fun onCreateView(
             parent: View?, name: String, context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
             return inflater.superOnCreateView(parent, name, attrs)
         }
@@ -310,7 +309,7 @@ internal class `-ViewPumpLayoutInflater`(
             parent: View?,
             name: String,
             context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
             // This mimics the {@code PhoneLayoutInflater} in the way it tries to inflate the base
             // classes, if this fails its pretty certain the app will fail at this point.
@@ -367,9 +366,9 @@ internal class `-ViewPumpLayoutInflater`(
             parent: View?,
             name: String,
             context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
-            return factory.onCreateView(name, context, attrs)
+            return attrs?.let { factory.onCreateView(name, context, it) }
         }
     }
 
@@ -414,9 +413,9 @@ internal class `-ViewPumpLayoutInflater`(
             parent: View?,
             name: String,
             context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
-            return factory2.onCreateView(parent, name, context, attrs)
+            return attrs?.let { factory2.onCreateView(parent, name, context, it) }
         }
     }
 
@@ -460,10 +459,10 @@ internal class `-ViewPumpLayoutInflater`(
             parent: View?,
             name: String,
             context: Context,
-            attrs: AttributeSet
+            attrs: AttributeSet?
         ): View? {
             return inflater.createCustomViewInternal(
-                factory2.onCreateView(parent, name, context, attrs), name, context, attrs
+                factory2.onCreateView(parent, name, context, checkNotNull(attrs) { "Should never happen!" }), name, context, attrs
             )
         }
     }