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Duration-jni.hpp
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Duration-jni.hpp
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#pragma once
#include "djinni/jni/djinni_support.hpp"
#include <cassert>
#include <chrono>
namespace djinni
{
struct DurationJniInfo
{
const GlobalRef<jclass> clazz { jniFindClass("java/time/Duration") };
const jmethodID method_ofNanos { jniGetStaticMethodID(clazz.get(), "ofNanos", "(J)Ljava/time/Duration;") };
const jmethodID method_toNanos { jniGetMethodID(clazz.get(), "toNanos", "()J") };
};
// This is only a helper, trying to use it as member/param will fail
template<class Ratio>
struct DurationPeriod;
using Duration_h = DurationPeriod<std::ratio<3600>>;
using Duration_min = DurationPeriod<std::ratio<60>>;
using Duration_s = DurationPeriod<std::ratio<1>>;
using Duration_ms = DurationPeriod<std::milli>;
using Duration_us = DurationPeriod<std::micro>;
using Duration_ns = DurationPeriod<std::nano>;
template<class Rep, class Period>
struct Duration;
template<class Rep, class Ratio>
struct Duration<Rep, DurationPeriod<Ratio>>
{
using CppType = std::chrono::duration<typename Rep::CppType, Ratio>;
using JniType = jobject;
using Boxed = Duration;
static CppType toCpp(JNIEnv* jniEnv, JniType j)
{
assert(j != nullptr);
const auto& data = JniClass<DurationJniInfo>::get();
assert(jniEnv->IsInstanceOf(j, data.clazz.get()));
jlong nanos = jniEnv->CallLongMethod(j, data.method_toNanos);
jniExceptionCheck(jniEnv);
return std::chrono::duration_cast<CppType>(std::chrono::duration<jlong, std::nano>{nanos});
}
static LocalRef<jobject> fromCpp(JNIEnv* jniEnv, CppType c)
{
const auto& data = JniClass<DurationJniInfo>::get();
jlong nanos = std::chrono::duration_cast<std::chrono::duration<jlong, std::nano>>(c).count();
auto j = LocalRef<JniType>{jniEnv->CallStaticObjectMethod(data.clazz.get(), data.method_ofNanos, nanos)};
jniExceptionCheck(jniEnv);
return j;
}
};
}