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tagging.hpp
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tagging.hpp
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#pragma once
#include <jni/traits.hpp>
#include <jni/unique.hpp>
#include <type_traits>
namespace jni
{
class ObjectBase;
template < class Tag > class Object;
template < class E, class = void > class Array;
template < class > struct TypeSignature;
struct ObjectTag
{
static constexpr auto Name() { return "java/lang/Object"; }
};
struct StringTag
{
static constexpr auto Name() { return "java/lang/String"; }
};
struct ClassTag
{
static constexpr auto Name() { return "java/lang/Class"; }
};
template < class T >
struct ArrayTag
{
static constexpr auto Name() { return TypeSignature<Array<T>>()(); }
};
template < class Tag, class = int >
struct SuperTag
{
using Type = ObjectTag;
};
template < class Tag >
struct SuperTag< Tag, decltype(std::declval<typename Tag::SuperTag>(), 0) >
{
using Type = typename Tag::SuperTag;
};
template < class Tag, class Enable = void >
struct TagTraits
{
using SuperType = Object<typename SuperTag<Tag>::Type>;
using UntaggedType = jobject;
};
template <>
struct TagTraits< ObjectTag >
{
using SuperType = ObjectBase;
using UntaggedType = jobject;
};
template <>
struct TagTraits< StringTag >
{
using SuperType = Object<ObjectTag>;
using UntaggedType = jstring;
};
template <>
struct TagTraits< ClassTag >
{
using SuperType = Object<ObjectTag>;
using UntaggedType = jclass;
};
template < class E >
struct TagTraits< ArrayTag<E>, std::enable_if_t<IsPrimitive<E>::value> >
{
using SuperType = Object<ObjectTag>;
using UntaggedType = jarray<E>;
};
template < class Tag >
struct TagTraits< ArrayTag<Object<Tag>> >
{
using SuperType = Object<ObjectTag>;
using UntaggedType = jarray<jobject>;
};
template < class T >
auto Tag(JNIEnv&, T primitive)
-> std::enable_if_t< IsPrimitive<T>::value, T >
{
return primitive;
}
template < class T, class U >
auto Tag(JNIEnv& env, U* u)
-> std::enable_if_t< !IsPrimitive<T>::value, Input<T> >
{
return Input<T>(env, u);
}
template < class T, class U >
auto Tag(JNIEnv& env, U& u)
-> std::enable_if_t< !IsPrimitive<T>::value, Input<T> >
{
return Input<T>(env, &u);
}
template < class T >
auto Untag(T primitive)
-> std::enable_if_t< IsPrimitive<T>::value, T >
{
return primitive;
}
template < class T >
auto Untag(const T& t)
-> std::enable_if_t< !IsPrimitive<T>::value, decltype(t.get()) >
{
return t.get();
}
template < class T >
using UntaggedType = decltype(Untag(std::declval<T>()));
}