92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
/*
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#pragma once
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#include <memory>
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#include <type_traits>
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#include <jni.h>
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#include <fb/Environment.h>
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namespace facebook { namespace jni {
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template<typename T>
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class GlobalReference {
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static_assert(std::is_convertible<T, jobject>::value,
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"GlobalReference<T> instantiated with type that is not "
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"convertible to jobject");
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public:
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explicit GlobalReference(T globalReference) :
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reference_(globalReference? Environment::current()->NewGlobalRef(globalReference) : nullptr) {
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}
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~GlobalReference() {
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reset();
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}
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GlobalReference() :
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reference_(nullptr) {
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}
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// enable move constructor and assignment
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GlobalReference(GlobalReference&& rhs) :
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reference_(std::move(rhs.reference_)) {
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rhs.reference_ = nullptr;
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}
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GlobalReference& operator=(GlobalReference&& rhs) {
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if (this != &rhs) {
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reset();
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reference_ = std::move(rhs.reference_);
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rhs.reference_ = nullptr;
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}
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return *this;
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}
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GlobalReference(const GlobalReference<T>& rhs) :
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reference_{} {
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reset(rhs.get());
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}
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GlobalReference& operator=(const GlobalReference<T>& rhs) {
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if (this == &rhs) {
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return *this;
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}
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reset(rhs.get());
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return *this;
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}
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explicit operator bool() const {
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return (reference_ != nullptr);
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}
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T get() const {
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return reinterpret_cast<T>(reference_);
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}
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void reset(T globalReference = nullptr) {
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if (reference_) {
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Environment::current()->DeleteGlobalRef(reference_);
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}
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if (globalReference) {
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reference_ = Environment::current()->NewGlobalRef(globalReference);
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} else {
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reference_ = nullptr;
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}
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}
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private:
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jobject reference_;
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};
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}}
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