Manual resync of moved fbjni files

lib/fb/src/main/cpp/include/jni/GlobalReference.h

@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <memory>
+#include <type_traits>
+
+#include <jni.h>
+
+#include <fb/Environment.h>
+
+namespace facebook { namespace jni {
+
+template<typename T>
+class GlobalReference {
+  static_assert(std::is_convertible<T, jobject>::value,
+                "GlobalReference<T> instantiated with type that is not "
+                "convertible to jobject");
+
+ public:
+  explicit GlobalReference(T globalReference) :
+    reference_(globalReference? Environment::current()->NewGlobalRef(globalReference) : nullptr) {
+  }
+
+  ~GlobalReference() {
+    reset();
+  }
+
+  GlobalReference() :
+    reference_(nullptr) {
+  }
+
+  // enable move constructor and assignment
+  GlobalReference(GlobalReference&& rhs) :
+    reference_(std::move(rhs.reference_)) {
+    rhs.reference_ = nullptr;
+  }
+
+  GlobalReference& operator=(GlobalReference&& rhs) {
+    if (this != &rhs) {
+      reset();
+      reference_ = std::move(rhs.reference_);
+      rhs.reference_ = nullptr;
+    }
+    return *this;
+  }
+
+  GlobalReference(const GlobalReference<T>& rhs) :
+    reference_{} {
+    reset(rhs.get());
+  }
+
+  GlobalReference& operator=(const GlobalReference<T>& rhs) {
+    if (this == &rhs) {
+      return *this;
+    }
+    reset(rhs.get());
+    return *this;
+  }
+
+  explicit operator bool() const {
+    return (reference_ != nullptr);
+  }
+
+  T get() const {
+    return reinterpret_cast<T>(reference_);
+  }
+
+  void reset(T globalReference = nullptr) {
+    if (reference_) {
+      Environment::current()->DeleteGlobalRef(reference_);
+    }
+    if (globalReference) {
+      reference_ = Environment::current()->NewGlobalRef(globalReference);
+    } else {
+      reference_ = nullptr;
+    }
+  }
+
+ private:
+  jobject reference_;
+};
+
+}}