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#ifndef CLEVERSYNC_JNI_HPP
#define CLEVERSYNC_JNI_HPP
#include <jni.h>
#include <string>
#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);
} // namespace internal
template<class T>
class Ref {
public:
constexpr Ref() : env_(nullptr), ptr_(0) {}
Ref(const Ref<T>&) = delete;
Ref<T>& operator=(const Ref<T>&) = delete;
[[nodiscard]] T get() const { return ptr_; }
[[nodiscard]] T release() {
auto ret = release_to_local();
ptr_ = 0;
return ret;
}
void reset() {
del();
ptr_ = 0;
}
explicit operator bool() const { return ptr_ != 0; }
protected:
Ref(JNIEnv* env, T ptr): env_(env), ptr_(ptr) {}
virtual ~Ref() = default;
virtual T release_to_local() = 0;
virtual void del() = 0;
JNIEnv* const env_;
T ptr_;
};
template<class T>
class LocalRef : public Ref<T> {
public:
LocalRef(JNIEnv* env, T ptr): Ref<T>(env, ptr) {}
~LocalRef() override { free(); }
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;
protected:
T release_to_local() override {
if (this->ptr_)
return static_cast<T>(this->env_->NewLocalRef(static_cast<jobject>(this->ptr_)));
return 0;
}
void del() override {}
};
template<class T>
class GlobalRef : public Ref<T> {
public:
GlobalRef(JNIEnv* env, T ptr) : Ref<T>(env, ptr ? env->NewGlobalRef(ptr) : 0) {}
explicit GlobalRef(const Ref<T>& other) : Ref<T>(other.env_, other ? other.env_->NewGlobalRef(other.ptr_) : 0) {}
~GlobalRef() override { free(); }
protected:
T release_to_local() override {
if (this->ptr_) {
auto ret = static_cast<T>(this->env_->NewLocalRef(
static_cast<jobject>(this->ptr_)));
free();
return ret;
}
return 0;
}
void del() override { free(); }
private:
void free() {
if (this->ptr_)
this->env_->DeleteGlobalRef(this->ptr_);
}
};
constexpr jint JNI_VERSION = JNI_VERSION_1_2;
JNIEnv* AttachCurrentThread();
JNIEnv* OnLoad(JavaVM* vm);
LocalRef<jclass> FindClass(JNIEnv *env, const char *name);
LocalRef<jthrowable> ExceptionOccurred(JNIEnv* env);
template<typename Out, typename In>
LocalRef<Out> CallObjectMethod(JNIEnv* env, const Ref<In>& object, jmethodID method) {
return {env, static_cast<Out>(env->CallObjectMethod(object.get(), method))};
}
std::string StringToUTF8(JNIEnv* env, const Ref<jstring>& str);
LocalRef<jstring> UTF8ToString(JNIEnv* env, const std::string& str);
namespace internal {
template<typename T>
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);
}
} // namespace internal
} // namespace jni
#endif // CLEVERSYNC_JNI_HPP
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