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#ifndef CLEVERSYNC_JNI_HPP
#define CLEVERSYNC_JNI_HPP
#include <jni.h>
#include <string>
#include <vector>
#define ABORT_IF_NOT_OK(x) (::jni::internal::_abort_if_not_ok(__FILE__, __LINE__, (x)))
#define ABORT_IF_NULL(env, x) (::jni::internal::_abort_if_null(__FILE__, __LINE__, (env), (x)))
namespace jni {
namespace internal {
void _abort_if_not_ok(const char *file, int line, jint ret);
void _abort_with_exception(const char* file, int line, JNIEnv* env);
JNIEnv* NonFatalAttachCurrentThread();
} // namespace internal
template<class T>
class Ref {
public:
constexpr Ref() : ptr_(nullptr) {}
constexpr Ref(std::nullptr_t) : ptr_(nullptr) {}
Ref(const Ref<T>&) = delete;
[[nodiscard]] T get() const { return ptr_; }
[[nodiscard]] T release() {
auto ret = release_to_local();
ptr_ = nullptr;
return ret;
}
void reset() {
del();
ptr_ = nullptr;
}
explicit operator bool() const { return ptr_ != nullptr; }
protected:
Ref(JNIEnv* env, T ptr): env_(env), ptr_(ptr) {}
virtual ~Ref() = default;
virtual T release_to_local() = 0;
virtual void del() = 0;
JNIEnv* env_;
T ptr_;
};
constexpr jint JNI_VERSION = JNI_VERSION_1_2;
JNIEnv* AttachCurrentThread();
JNIEnv* OnLoad(JavaVM* vm);
template<class T>
class LocalRef : public Ref<T> {
public:
constexpr LocalRef(): Ref<T>() {}
constexpr LocalRef(std::nullptr_t): Ref<T>() {}
LocalRef(JNIEnv* env, T ptr): Ref<T>(env, ptr) {}
~LocalRef() override { free(); }
LocalRef(LocalRef<T> &&ref) noexcept : Ref<T>(ref.env_, ref.release()) {}
LocalRef& operator=(const Ref<T>& other) = delete;
LocalRef& operator=(LocalRef<T> &&ref) noexcept {
free();
this->env_ = ref.env_;
this->ptr_ = ref.release();
return *this;
}
protected:
T release_to_local() override { return this->ptr_; }
void del() override { free(); }
private:
void free() {
if (this->ptr_)
this->env_->DeleteLocalRef(this->ptr_);
}
};
template<class T>
class ParamRef : public Ref<T> {
public:
ParamRef(JNIEnv* env, T ptr) : Ref<T>(env, ptr) {}
~ParamRef() override = default;
ParamRef& operator=(const Ref<T>& other) = delete;
protected:
T release_to_local() override {
if (this->ptr_)
return static_cast<T>(this->env_->NewLocalRef(static_cast<jobject>(this->ptr_)));
return nullptr;
}
void del() override {}
};
template<class T>
class GlobalRef : public Ref<T> {
public:
constexpr GlobalRef() : Ref<T>() {}
constexpr GlobalRef(std::nullptr_t) : Ref<T>() {}
GlobalRef(JNIEnv* env, T ptr) : Ref<T>() {
if (ptr) {
if (!env)
env = AttachCurrentThread();
this->ptr_ = static_cast<T>(env->NewGlobalRef(static_cast<jobject>(ptr)));
}
}
GlobalRef(const Ref<T>& other) : Ref<T>() {
if (other) {
auto* env = AttachCurrentThread();
this->ptr_ = static_cast<T>(env->NewGlobalRef(static_cast<jobject>(other.get())));
}
}
GlobalRef(GlobalRef<T>&& other) noexcept : Ref<T>(nullptr, other.ptr_) {
other.ptr_ = nullptr;
return *this;
}
~GlobalRef() override { free(); }
GlobalRef& operator=(const Ref<T>& other) {
free();
if (other) {
auto* env = AttachCurrentThread();
this->ptr_ = other ? static_cast<T>(env->NewGlobalRef(static_cast<jobject>(other.get()))) : nullptr;
} else {
this->ptr_ = nullptr;
}
return *this;
}
GlobalRef& operator=(GlobalRef<T>&& other) {
free();
this->ptr_ = other.ptr_;
other.ptr_ = nullptr;
}
protected:
T release_to_local() override {
if (this->ptr_) {
auto* env = AttachCurrentThread();
auto ret = static_cast<T>(env->NewLocalRef(static_cast<jobject>(this->ptr_)));
env->DeleteGlobalRef(static_cast<jobject>(this->ptr_));
return ret;
}
return nullptr;
}
void del() override { free(); }
private:
void free() {
if (this->ptr_) {
auto* env = internal::NonFatalAttachCurrentThread();
if (env)
env->DeleteGlobalRef(static_cast<jobject>(this->ptr_));
}
}
};
LocalRef<jclass> FindClass(JNIEnv *env, const char *name);
LocalRef<jthrowable> ExceptionOccurred(JNIEnv* env);
template<typename Out, typename In, typename... Params>
LocalRef<Out> CallObjectMethod(JNIEnv* env, const Ref<In>& object, jmethodID method, Params... params) {
return {env, static_cast<Out>(env->CallObjectMethod(object.get(), method, params...))};
}
template<typename Out, typename... Params>
LocalRef<Out> CallStaticObjectMethod(JNIEnv* env, const Ref<jclass>& clazz, jmethodID method, Params... params) {
return {env, static_cast<Out>(env->CallStaticObjectMethod(clazz.get(), method, params...))};
}
std::string StringToUTF8(JNIEnv* env, const Ref<jstring>& str);
LocalRef<jstring> UTF8ToString(JNIEnv* env, const std::string& str);
LocalRef<jobjectArray> CreateArray(JNIEnv* env, const Ref<jclass>& element_class, std::vector<LocalRef<jobject>> objects);
namespace internal {
template<typename T>
inline void _abort_if_null(const char* file, int line, JNIEnv* env, const jni::Ref<T>& ref) {
if (ref) [[likely]] return;
_abort_with_exception(file, line, env);
}
inline void _abort_if_null(const char* file, int line, JNIEnv* env, jmethodID ref) {
if (ref) [[likely]] return;
_abort_with_exception(file, line, env);
}
} // namespace internal
} // namespace jni
#endif // CLEVERSYNC_JNI_HPP
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