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.h

@@ -0,0 +1,73 @@
+/*
+ * 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.
+ */
+#pragma once
+#include "ScopedGlobalRef.h"
+#include "ScopedLocalRef.h"
+
+namespace facebook {
+namespace yoga {
+namespace vanillajni {
+
+/**
+ * Registers a set of methods for a JNI class. Aborts if registration fails.
+ */
+void registerNatives(
+    JNIEnv* env,
+    const char* className,
+    const JNINativeMethod methods[],
+    size_t numMethods);
+
+/**
+ * Returns a jmethodID for a class static method. Aborts if any error happens.
+ */
+jmethodID getStaticMethodId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* methodName,
+    const char* methodDescriptor);
+
+/**
+ * Returns a jmethodID for a class non-static method. Aborts if any error
+ * happens.
+ */
+jmethodID getMethodId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* methodName,
+    const char* methodDescriptor);
+
+/**
+ * Returns a class non-static field ID. Aborts if any error happens.
+ */
+jfieldID getFieldId(
+    JNIEnv* env,
+    jclass clazz,
+    const char* fieldName,
+    const char* fieldSignature);
+
+// Helper methods to call a non-static method on an object depending on the
+// return type. Each method will abort the execution if an error
+// (such as a Java pending exception) is detected after invoking the
+// Java method.
+#define DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(jnitype, readableType) \
+  jnitype call##readableType##Method(                                     \
+      JNIEnv* env, jobject obj, jmethodID methodId, ...)
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(void, Void);
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(jlong, Long);
+DEFINE_CALL_METHOD_FOR_PRIMITIVE_INTERFACE(jfloat, Float);
+
+ScopedLocalRef<jobject>
+callStaticObjectMethod(JNIEnv* env, jclass clazz, jmethodID methodId, ...);
+
+/**
+ * Given a local or a global reference, this method creates a new global
+ * reference out of it. If any error happens, aborts the process.
+ */
+ScopedGlobalRef<jobject> newGlobalRef(JNIEnv* env, jobject obj);
+} // namespace vanillajni
+} // namespace yoga
+} // namespace facebook