Add Scoped Local and Global Ref

Summary: Add ScopedLocalRef, ScopedGlobalRef and some common methods to be used later.

Reviewed By: amir-shalem

Differential Revision: D17711284

fbshipit-source-id: be43d5e246bc2406765057783be11854877c41f1

java/jni/common.cpp

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+#include "common.h"
+
+namespace facebook {
+namespace yoga {
+namespace vanillajni {
+
+void registerNatives(
+    JNIEnv* env,
+    const char* className,
+    const JNINativeMethod methods[],
+    size_t numMethods) {
+  jclass clazz = env->FindClass(className);
+
+  assertNoPendingJniException(env);
+
+  env->RegisterNatives(clazz, methods, numMethods);
+
+  assertNoPendingJniException(env);
+}
+
+jmethodID getStaticMethodId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* methodName,
+    const char* methodDescriptor) {
+  jmethodID methodId =
+      env->GetStaticMethodID(clazz, methodName, methodDescriptor);
+  assertNoPendingJniException(env);
+  return methodId;
+}
+
+jmethodID getMethodId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* methodName,
+    const char* methodDescriptor) {
+  jmethodID methodId = env->GetMethodID(clazz, methodName, methodDescriptor);
+  assertNoPendingJniException(env);
+  return methodId;
+}
+
+jfieldID getFieldId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* fieldName,
+    const char* fieldSignature) {
+  jfieldID fieldId = env->GetFieldID(clazz, fieldName, fieldSignature);
+  assertNoPendingJniException(env);
+  return fieldId;
+}
+
+#define DEFINE_CALL_METHOD_FOR_PRIMITIVE_IMPLEMENTATION(jnitype, readableType) \
+  DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(jnitype, readableType) {          \
+    va_list args;                                                              \
+    va_start(args, methodId);                                                  \
+    jnitype result = env->Call##readableType##MethodV(obj, methodId, args);    \
+    va_end(args);                                                              \
+    assertNoPendingJniException(env);                                          \
+    return result;                                                             \
+  }
+
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_IMPLEMENTATION(jlong, Long);
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_IMPLEMENTATION(jfloat, Float);
+
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(void, Void) {
+  va_list args;
+  va_start(args, methodId);
+  env->CallVoidMethodV(obj, methodId, args);
+  va_end(args);
+  assertNoPendingJniException(env);
+}
+
+ScopedLocalRef<jobject>
+callStaticObjectMethod(JNIEnv* env, jclass clazz, jmethodID methodId, ...) {
+  va_list args;
+  va_start(args, methodId);
+  jobject result = env->CallStaticObjectMethodV(clazz, methodId, args);
+  va_end(args);
+  assertNoPendingJniException(env);
+  return make_local_ref(env, result);
+}
+
+ScopedGlobalRef<jobject> newGlobalRef(JNIEnv* env, jobject obj) {
+  jobject result = env->NewGlobalRef(obj);
+
+  if (!result) {
+    logErrorMessageAndDie("Could not obtain global reference from object");
+  }
+
+  return make_global_ref(result);
+}
+} // namespace vanillajni
+} // namespace yoga
+} // namespace facebook