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Added JNI wrappers; reworked JNIMiniHelper to use them
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,189 @@ | ||
| /* | ||
| * Copyright 2023 Diligent Graphics LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * In no event and under no legal theory, whether in tort (including negligence), | ||
| * contract, or otherwise, unless required by applicable law (such as deliberate | ||
| * and grossly negligent acts) or agreed to in writing, shall any Contributor be | ||
| * liable for any damages, including any direct, indirect, special, incidental, | ||
| * or consequential damages of any character arising as a result of this License or | ||
| * out of the use or inability to use the software (including but not limited to damages | ||
| * for loss of goodwill, work stoppage, computer failure or malfunction, or any and | ||
| * all other commercial damages or losses), even if such Contributor has been advised | ||
| * of the possibility of such damages. | ||
| */ | ||
|
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| #pragma once | ||
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| #include <jni.h> | ||
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| namespace Diligent | ||
| { | ||
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| namespace JNIWrappers | ||
| { | ||
|
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| class Method | ||
| { | ||
| public: | ||
| Method(JNIEnv& env, jclass cls, const char* name, const char* sig) : | ||
| env_{env}, | ||
| mid_{env.GetMethodID(cls, name, sig)} | ||
| { | ||
| } | ||
|
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| template <typename RetType, typename... Args> | ||
| RetType Call(jobject obj, Args&&... args) | ||
| { | ||
| return static_cast<RetType>(env_.CallObjectMethod(obj, mid_, std::forward<Args>(args)...)); | ||
| } | ||
|
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| explicit operator bool() const | ||
| { | ||
| return mid_ != nullptr; | ||
| } | ||
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| private: | ||
| JNIEnv& env_; | ||
| jmethodID mid_ = nullptr; | ||
| }; | ||
|
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| class Clazz | ||
| { | ||
| public: | ||
| Clazz(JNIEnv& env, const char* class_name) : | ||
| env_{env}, | ||
| cls_{class_name != nullptr ? env_.FindClass(class_name) : nullptr} | ||
| { | ||
| } | ||
|
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| Clazz(Clazz&& other) : | ||
| env_{other.env_}, | ||
| cls_{other.cls_} | ||
| { | ||
| other.cls_ = nullptr; | ||
| } | ||
|
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| Clazz(Clazz& other) = delete; | ||
|
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| ~Clazz() | ||
| { | ||
| if (cls_ != nullptr) | ||
| { | ||
| env_.DeleteLocalRef(cls_); | ||
| } | ||
| } | ||
|
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| Method GetMethod(const char* name, const char* sig) | ||
| { | ||
| return Method{env_, cls_, name, sig}; | ||
| } | ||
|
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| explicit operator bool() const | ||
| { | ||
| return cls_ != nullptr; | ||
| } | ||
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| protected: | ||
| JNIEnv& env_; | ||
| jclass cls_ = nullptr; | ||
| }; | ||
|
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| template <typename ObjType = jobject> | ||
| class Object : public Clazz | ||
| { | ||
| public: | ||
| Object(JNIEnv& env, ObjType obj, const char* class_name = nullptr) : | ||
| Clazz{env, class_name}, | ||
| obj_{obj} | ||
| { | ||
| } | ||
|
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| Object(Object&& other) : | ||
| Clazz(std::move(static_cast<Clazz&>(other))), | ||
| obj_{other.obj_} | ||
| { | ||
| other.obj_ = nullptr; | ||
| } | ||
|
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| Object(Object& other) = delete; | ||
|
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| ~Object() | ||
| { | ||
| if (obj_ != nullptr) | ||
| { | ||
| env_.DeleteLocalRef(obj_); | ||
| } | ||
| } | ||
|
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| ObjType Detach() | ||
| { | ||
| ObjType obj = obj_; | ||
| obj_ = nullptr; | ||
| return obj; | ||
| } | ||
|
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| explicit operator bool() const | ||
| { | ||
| return static_cast<const Clazz&>(*this) && (obj_ != nullptr); | ||
| } | ||
|
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| protected: | ||
| ObjType obj_ = nullptr; | ||
| }; | ||
|
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| class String : public Object<jstring> | ||
| { | ||
| public: | ||
| String(JNIEnv& env, jstring str_obj) : | ||
| Object{env, str_obj} | ||
| { | ||
| } | ||
|
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| std::string GetStdString() | ||
| { | ||
| const char* chars = env_.GetStringUTFChars(obj_, nullptr); | ||
| std::string str{chars}; | ||
| env_.ReleaseStringUTFChars(obj_, chars); | ||
| return str; | ||
| } | ||
|
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| explicit operator bool() const | ||
| { | ||
| // Clazz is null | ||
| return obj_ != nullptr; | ||
| } | ||
| }; | ||
|
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| class File : public Object<> | ||
| { | ||
| public: | ||
| File(JNIEnv& env, jobject file_obj) : | ||
| Object{env, file_obj, "java/io/File"}, | ||
| get_path_method_{env_, cls_, "getPath", "()Ljava/lang/String;"} | ||
| { | ||
| } | ||
|
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| String GetPath() | ||
| { | ||
| return String{env_, get_path_method_.Call<jstring>(obj_)}; | ||
| } | ||
|
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| private: | ||
| Method get_path_method_; | ||
| }; | ||
|
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| } // namespace JNIWrappers | ||
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| } // namespace Diligent |