Replace getInt with asInt in native collections

Reviewed By: mhorowitz

Differential Revision: D5904751

fbshipit-source-id: 995412196fd76ea60a65253719e49852322be6e6

ReactAndroid/src/main/jni/react/jni/ReadableNativeArray.cpp

@@ -43,16 +43,9 @@ jdouble ReadableNativeArray::getDouble(jint index) {
 }
 
 jint ReadableNativeArray::getInt(jint index) {
-  auto integer = array_.at(index).getInt();
-  static_assert(std::is_same<decltype(integer), int64_t>::value,
-                "folly::dynamic int is not int64_t");
-  jint javaint = static_cast<jint>(integer);
-  if (integer != javaint) {
-    throwNewJavaException(
-      exceptions::gUnexpectedNativeTypeExceptionClass,
-      "Value '%lld' doesn't fit into a 32 bit signed int", integer);
-  }
-  return javaint;
+  const folly::dynamic& val = array_.at(index);
+  int64_t integer = convertDynamicIfIntegral(val);
+  return makeJIntOrThrow(integer);
 }
 
 const char* ReadableNativeArray::getString(jint index) {

ReactAndroid/src/main/jni/react/jni/ReadableNativeMap.cpp

@@ -46,14 +46,9 @@ double ReadableNativeMap::getDoubleKey(const std::string& key) {
 }
 
 jint ReadableNativeMap::getIntKey(const std::string& key) {
-  auto integer = getMapValue(key).getInt();
-  jint javaint = static_cast<jint>(integer);
-  if (integer != javaint) {
-    throwNewJavaException(
-      exceptions::gUnexpectedNativeTypeExceptionClass,
-      "Value '%lld' doesn't fit into a 32 bit signed int", integer);
-  }
-  return javaint;
+  const folly::dynamic& val = getMapValue(key);
+  int64_t integer = convertDynamicIfIntegral(val);
+  return makeJIntOrThrow(integer);
 }
 
 local_ref<jstring> ReadableNativeMap::getStringKey(const std::string& key) {
@@ -146,5 +141,29 @@ void ReadableNativeMapKeySetIterator::registerNatives() {
     });
 }
 
+jint makeJIntOrThrow(int64_t integer) {
+  jint javaint = static_cast<jint>(integer);
+  if (integer != javaint) {
+    throwNewJavaException(
+      exceptions::gUnexpectedNativeTypeExceptionClass,
+      "Value '%lld' doesn't fit into a 32 bit signed int", integer);
+  }
+  return javaint;
+}
+
+int64_t convertDynamicIfIntegral(const folly::dynamic& val) {
+  if (val.isInt()) {
+    return val.getInt();
+  }
+  double dbl = val.getDouble();
+  int64_t result = static_cast<int64_t>(dbl);
+  if (dbl != result) {
+    throwNewJavaException(
+      exceptions::gUnexpectedNativeTypeExceptionClass,
+      "Tried to read an int, but got a non-integral double: %f", dbl);
+  }
+  return result;
+}
+
 }  // namespace react
 }  // namespace facebook

ReactAndroid/src/main/jni/react/jni/ReadableNativeMap.h

@@ -55,5 +55,8 @@ struct ReadableNativeMapKeySetIterator : jni::HybridClass<ReadableNativeMapKeySe
   const folly::dynamic& map_;
 };
 
+jint makeJIntOrThrow(int64_t integer);
+int64_t convertDynamicIfIntegral(const folly::dynamic&);
+
 } // namespace react
 } // namespace facebook