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tdlib-fork/td/tl/tl_jni_object.h
levlam 8eb46f6715 Improve Java binding.
GitOrigin-RevId: ec10cb32f546a1249f4fe5f309eaff7488c31182
2018-01-15 16:47:24 +03:00

199 lines
5.3 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include <jni.h>
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
namespace td {
namespace td_api {
class keyboardButton;
class inlineKeyboardButton;
} // namespace td_api
namespace jni {
extern thread_local bool parse_error;
extern jclass ArrayKeyboardButtonClass;
extern jclass ArrayInlineKeyboardButtonClass;
extern jmethodID GetConstructorID;
extern jmethodID BooleanGetValueMethodID;
extern jmethodID IntegerGetValueMethodID;
extern jmethodID LongGetValueMethodID;
extern jmethodID DoubleGetValueMethodID;
std::string fetch_string(JNIEnv *env, jobject o, jfieldID id);
inline jobject fetch_object(JNIEnv *env, const jobject &o, const jfieldID &id) {
// null return object is implicitly allowed
return env->GetObjectField(o, id);
}
inline bool have_parse_error() {
return parse_error;
}
inline void reset_parse_error() {
parse_error = false;
}
std::string from_jstring(JNIEnv *env, jstring s);
jstring to_jstring(JNIEnv *env, const std::string &s);
std::string from_bytes(JNIEnv *env, jbyteArray arr);
jbyteArray to_bytes(JNIEnv *env, const std::string &b);
jclass get_jclass(JNIEnv *env, const char *class_name);
jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name, const char *sig);
jfieldID get_field_id(JNIEnv *env, jclass clazz, const char *name, const char *sig);
bool init_vars(JNIEnv *env, const char *td_api_java_package);
jintArray store_vector(JNIEnv *env, const std::vector<std::int32_t> &v);
jlongArray store_vector(JNIEnv *env, const std::vector<std::int64_t> &v);
jdoubleArray store_vector(JNIEnv *env, const std::vector<double> &v);
jobjectArray store_vector(JNIEnv *env, const std::vector<std::string> &v);
template <class T>
jobjectArray store_vector(JNIEnv *env, const std::vector<T> &v) {
jint length = static_cast<jint>(v.size());
jobjectArray arr = env->NewObjectArray(length, T::element_type::Class, jobject());
if (arr != nullptr) {
for (jint i = 0; i < length; i++) {
if (v[i] != nullptr) {
jobject stored_object;
v[i]->store(env, stored_object);
if (stored_object) {
env->SetObjectArrayElement(arr, i, stored_object);
env->DeleteLocalRef(stored_object);
}
}
}
}
return arr;
}
template <class T>
class get_array_class {
static jclass get();
};
template <>
class get_array_class<td_api::keyboardButton> {
public:
static jclass get() {
return ArrayKeyboardButtonClass;
}
};
template <>
class get_array_class<td_api::inlineKeyboardButton> {
public:
static jclass get() {
return ArrayInlineKeyboardButtonClass;
}
};
template <class T>
jobjectArray store_vector(JNIEnv *env, const std::vector<std::vector<T>> &v) {
jint length = static_cast<jint>(v.size());
jobjectArray arr = env->NewObjectArray(length, get_array_class<typename T::element_type>::get(), 0);
if (arr != nullptr) {
for (jint i = 0; i < length; i++) {
auto stored_array = store_vector(env, v[i]);
if (stored_array) {
env->SetObjectArrayElement(arr, i, stored_array);
env->DeleteLocalRef(stored_array);
}
}
}
return arr;
}
template <class T>
auto fetch_tl_object(JNIEnv *env, jobject obj) {
decltype(T::fetch(env, obj)) result;
if (obj != nullptr) {
result = T::fetch(env, obj);
env->DeleteLocalRef(obj);
}
return result;
}
std::vector<std::int32_t> fetch_vector(JNIEnv *env, jintArray arr);
std::vector<std::int64_t> fetch_vector(JNIEnv *env, jlongArray arr);
std::vector<double> fetch_vector(JNIEnv *env, jdoubleArray arr);
template <class T>
struct FetchVector {
static auto fetch(JNIEnv *env, jobjectArray arr) {
std::vector<decltype(fetch_tl_object<T>(env, jobject()))> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
result.reserve(length);
for (jsize i = 0; i < length; i++) {
result.push_back(fetch_tl_object<T>(env, env->GetObjectArrayElement(arr, i)));
}
env->DeleteLocalRef(arr);
}
return result;
}
};
template <>
struct FetchVector<std::string> {
static std::vector<std::string> fetch(JNIEnv *env, jobjectArray arr) {
std::vector<std::string> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
result.reserve(length);
for (jsize i = 0; i < length; i++) {
jstring str = (jstring)env->GetObjectArrayElement(arr, i);
result.push_back(jni::from_jstring(env, str));
if (str) {
env->DeleteLocalRef(str);
}
}
env->DeleteLocalRef(arr);
}
return result;
}
};
template <class T>
struct FetchVector<std::vector<T>> {
static auto fetch(JNIEnv *env, jobjectArray arr) {
std::vector<decltype(FetchVector<T>::fetch(env, jobjectArray()))> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
result.reserve(length);
for (jsize i = 0; i < length; i++) {
result.push_back(FetchVector<T>::fetch(env, (jobjectArray)env->GetObjectArrayElement(arr, i)));
}
env->DeleteLocalRef(arr);
}
return result;
}
};
} // namespace jni
} // namespace td