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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtAndroidExtras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
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****************************************************************************/

#include "jnimessenger.h"

#include <QAndroidJniObject>
#include <QAndroidJniEnvironment>
#include <QtAndroid>

JniMessenger *JniMessenger::m_instance = nullptr;

static void callFromJava(JNIEnv *env, jobject /*thiz*/, jstring value)
{
    emit JniMessenger::instance()->messageFromJava(env->GetStringUTFChars(value, nullptr));
}

JniMessenger::JniMessenger(QObject *parent) : QObject(parent)
{
    m_instance = this;

    JNINativeMethod methods[] {{"callFromJava", "(Ljava/lang/String;)V", reinterpret_cast<void *>(callFromJava)}};
    QAndroidJniObject javaClass("org/qtproject/example/jnimessenger/JniMessenger");

    QAndroidJniEnvironment env;
    jclass objectClass = env->GetObjectClass(javaClass.object<jobject>());
    env->RegisterNatives(objectClass,
                         methods,
                         sizeof(methods) / sizeof(methods[0]));
    env->DeleteLocalRef(objectClass);
}

void JniMessenger::printFromJava(const QString &message)
{
    QAndroidJniObject javaMessage = QAndroidJniObject::fromString(message);
    QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/jnimessenger/JniMessenger",
                                       "printFromJava",
                                       "(Ljava/lang/String;)V",
                                        javaMessage.object<jstring>());
}