Convert StateWrapperImpl.java to Kotlin (facebook#50615)

Summary:
Pull Request resolved: facebook#50615

Convert Java to Kotlin

Changelog:
[Internal]

Differential Revision: D72752437

Author: alanleedev

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -2389,13 +2389,13 @@ public final class com/facebook/react/fabric/FabricUIManagerProviderImpl : com/f
 	public fun createUIManager (Lcom/facebook/react/bridge/ReactApplicationContext;)Lcom/facebook/react/bridge/UIManager;
 }
 
-public class com/facebook/react/fabric/StateWrapperImpl : com/facebook/jni/HybridClassBase, com/facebook/react/uimanager/StateWrapper {
+public final class com/facebook/react/fabric/StateWrapperImpl : com/facebook/jni/HybridClassBase, com/facebook/react/uimanager/StateWrapper {
 	public fun destroyState ()V
 	public fun getStateData ()Lcom/facebook/react/bridge/ReadableNativeMap;
 	public fun getStateDataMapBuffer ()Lcom/facebook/react/common/mapbuffer/ReadableMapBuffer;
 	public fun toString ()Ljava/lang/String;
 	public fun updateState (Lcom/facebook/react/bridge/WritableMap;)V
-	public fun updateStateImpl (Lcom/facebook/react/bridge/NativeMap;)V
+	public final fun updateStateImpl (Lcom/facebook/react/bridge/NativeMap;)V
 }
 
 public final class com/facebook/react/fabric/events/EventBeatManager : com/facebook/jni/HybridClassBase, com/facebook/react/uimanager/events/BatchEventDispatchedListener {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/StateWrapperImpl.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.fabric
+
+import android.annotation.SuppressLint
+import com.facebook.common.logging.FLog
+import com.facebook.jni.HybridClassBase
+import com.facebook.proguard.annotations.DoNotStripAny
+import com.facebook.react.bridge.NativeMap
+import com.facebook.react.bridge.ReadableNativeMap
+import com.facebook.react.bridge.WritableMap
+import com.facebook.react.common.mapbuffer.ReadableMapBuffer
+import com.facebook.react.uimanager.StateWrapper
+
+/**
+ * This class holds reference to the C++ EventEmitter object. Instances of this class are created on
+ * the Bindings.cpp, where the pointer to the C++ event emitter is set.
+ */
+@SuppressLint("MissingNativeLoadLibrary")
+@DoNotStripAny
+public class StateWrapperImpl private constructor() : HybridClassBase(), StateWrapper {
+
+  private external fun initHybrid()
+
+  private external fun getStateDataImpl(): ReadableNativeMap?
+
+  private external fun getStateMapBufferDataImpl(): ReadableMapBuffer?
+
+  public external fun updateStateImpl(map: NativeMap)
+
+  public override val stateDataMapBuffer: ReadableMapBuffer?
+    get() {
+      if (!isValid) {
+        FLog.e(TAG, "Race between StateWrapperImpl destruction and getState")
+        return null
+      }
+      return getStateMapBufferDataImpl()
+    }
+
+  public override val stateData: ReadableNativeMap?
+    get() {
+      if (!isValid) {
+        FLog.e(TAG, "Race between StateWrapperImpl destruction and getState")
+        return null
+      }
+      return getStateDataImpl()
+    }
+
+  init {
+    initHybrid()
+  }
+
+  override fun updateState(map: WritableMap) {
+    if (!isValid) {
+      FLog.e(TAG, "Race between StateWrapperImpl destruction and updateState")
+      return
+    }
+    updateStateImpl(map as NativeMap)
+  }
+
+  override fun destroyState() {
+    if (isValid) {
+      resetNative()
+    }
+  }
+
+  override fun toString(): String {
+    if (!isValid) {
+      return "<destroyed>"
+    }
+
+    val mapBuffer = getStateMapBufferDataImpl()
+    if (mapBuffer != null) {
+      return mapBuffer.toString()
+    }
+
+    return getStateDataImpl()?.toString() ?: "<unexpected null: stateDataImpl>"
+  }
+
+  private companion object {
+    init {
+      FabricSoLoader.staticInit()
+    }
+
+    private const val TAG = "StateWrapperImpl"
+  }
+}