SelfDetachingJNIEnv.h

/*
 * Copyright (C) 2014 Google Inc.
 *
 * 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.
 */

#ifndef SELFDETACHINGJNIENV_H
#define SELFDETACHINGJNIENV_H

#include <QObject>

#if defined(Q_OS_ANDROID)

#include <jni.h>

class SelfDetachingJNIEnv {
public:
    SelfDetachingJNIEnv(SelfDetachingJNIEnv&& value);
    SelfDetachingJNIEnv(SelfDetachingJNIEnv& value) = delete;
    SelfDetachingJNIEnv(const SelfDetachingJNIEnv& value) = delete;

    virtual ~SelfDetachingJNIEnv();

    JNIEnv* getJNIEnv() const;
    JNIEnv& operator*();
    const JNIEnv& operator*() const;
    JNIEnv* operator->();
    const JNIEnv* operator->() const;
    SelfDetachingJNIEnv& operator=(SelfDetachingJNIEnv&& value);
    SelfDetachingJNIEnv& operator=(SelfDetachingJNIEnv& value) = delete;
    SelfDetachingJNIEnv& operator=(const SelfDetachingJNIEnv& value) = delete;
    operator bool() const { return mJNI; }

    static SelfDetachingJNIEnv fromJVM(JavaVM* vm);

private:
    SelfDetachingJNIEnv() { }
    SelfDetachingJNIEnv(JavaVM* vm, JNIEnv* jni, bool attached);

    JavaVM* mVM = nullptr;
    JNIEnv* mJNI = nullptr;
    bool mAttached = false;
};

#endif // Q_OS_ANDROID
#endif // SELFDETACHINGJNIENV_H