Provide I18n Module in OSS 1/3

Summary: Create I18nUtil and I18nManagerModule for OSS.

Reviewed By: dmmiller

Differential Revision: D3575674

fbshipit-source-id: aad96be167f3e7b0692a9cc2c7f8a558e7aa722a

ReactAndroid/src/main/java/com/facebook/react/modules/i18nmanager/BUCK

@@ -0,0 +1,19 @@
+include_defs('//ReactAndroid/DEFS')
+
+android_library(
+  name = 'i18nmanager',
+  srcs = glob(['*.java']),
+  deps = [
+    react_native_dep('third-party/java/infer-annotations:infer-annotations'),
+    react_native_dep('third-party/java/jsr-305:jsr-305'),
+    react_native_target('java/com/facebook/react/bridge:bridge'),
+    react_native_target('java/com/facebook/react/common:common'),
+  ],
+  visibility = [
+    'PUBLIC',
+  ],
+)
+
+project_config(
+  src_target = ':i18nmanager',
+)

ReactAndroid/src/main/java/com/facebook/react/modules/i18nmanager/I18nManagerModule.java

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.modules.i18nmanager;
+
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.common.MapBuilder;
+
+import java.util.Map;
+
+
+/**
+ * {@link NativeModule} that allows JS to set allowRTL and get isRTL status.
+ */
+public class I18nManagerModule extends ReactContextBaseJavaModule {
+
+  private final I18nUtil sharedI18nUtilInstance = I18nUtil.getInstance();
+
+  public I18nManagerModule(ReactApplicationContext reactContext) {
+    super(reactContext);
+  }
+
+  @Override
+  public String getName() {
+    return "I18nManager";
+  }
+
+  @Override
+  public Map<String, Object> getConstants() {
+    final Map<String, Object> constants = MapBuilder.newHashMap();
+    constants.put("isRTL", sharedI18nUtilInstance.isRTL(
+      getReactApplicationContext()
+    ));
+    return constants;
+  }
+
+  @ReactMethod
+  public void allowRTL(boolean value) {
+    sharedI18nUtilInstance.setAllowRTL(
+      getReactApplicationContext(),
+      value
+    );
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/modules/i18nmanager/I18nUtil.java

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.modules.i18nmanager;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+
+public class I18nUtil {
+  private static I18nUtil sharedI18nUtilInstance = null;
+
+  private static final String MY_PREFS_NAME =
+    "com.facebook.react.modules.i18nmanager.I18nUtil";
+  private static final String KEY_FOR_PREFS =
+    "RCTI18nUtil_allowRTL";
+
+  private I18nUtil() {
+     // Exists only to defeat instantiation.
+  }
+
+  public static I18nUtil getInstance() {
+    if(sharedI18nUtilInstance == null) {
+      sharedI18nUtilInstance = new I18nUtil();
+    }
+    return sharedI18nUtilInstance;
+  }
+
+  // If set allowRTL on the JS side,
+  // the RN app will automatically have a RTL layout.
+  public boolean isRTL(Context context) {
+    return allowRTL(context);
+  }
+
+  private boolean allowRTL(Context context) {
+    SharedPreferences prefs =
+      context.getSharedPreferences(MY_PREFS_NAME, Context.MODE_PRIVATE);
+    return prefs.getBoolean(KEY_FOR_PREFS, false);
+  }
+
+  public void setAllowRTL(Context context, boolean allowRTL) {
+    SharedPreferences.Editor editor =
+      context.getSharedPreferences(MY_PREFS_NAME, Context.MODE_PRIVATE).edit();
+    editor.putBoolean(KEY_FOR_PREFS, allowRTL);
+    editor.apply();
+  }
+}