src/controller/java/AndroidCallbacks.cpp

/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    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.
 */
#include "AndroidCallbacks.h"
#include "JniReferences.h"
#include "JniTypeWrappers.h"

#include <jni.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/ErrorStr.h>
#include <lib/support/logging/CHIPLogging.h>

using namespace chip::Controller;

GetConnectedDeviceCallback::GetConnectedDeviceCallback(jobject javaCallback) :
    mOnSuccess(OnDeviceConnectedFn, this), mOnFailure(OnDeviceConnectionFailureFn, this)
{
    JNIEnv * env = chip::Controller::JniReferences::GetInstance().GetEnvForCurrentThread();
    VerifyOrReturn(env != nullptr, ChipLogError(Controller, "Could not get JNIEnv for current thread"));
    mJavaCallbackRef = env->NewGlobalRef(javaCallback);
    if (mJavaCallbackRef == nullptr)
    {
        ChipLogError(Controller, "Could not create global reference for Java callback");
    }
}

GetConnectedDeviceCallback::~GetConnectedDeviceCallback()
{
    JNIEnv * env = chip::Controller::JniReferences::GetInstance().GetEnvForCurrentThread();
    VerifyOrReturn(env != nullptr, ChipLogError(Controller, "Could not get JNIEnv for current thread"));
    env->DeleteGlobalRef(mJavaCallbackRef);
}

void GetConnectedDeviceCallback::OnDeviceConnectedFn(void * context, Device * device)
{
    JNIEnv * env         = JniReferences::GetInstance().GetEnvForCurrentThread();
    auto * self          = static_cast<GetConnectedDeviceCallback *>(context);
    jobject javaCallback = self->mJavaCallbackRef;

    jclass getConnectedDeviceCallbackCls = nullptr;
    JniReferences::GetInstance().GetClassRef(env, "chip/devicecontroller/GetConnectedDeviceCallbackJni$GetConnectedDeviceCallback",
                                             getConnectedDeviceCallbackCls);
    VerifyOrReturn(getConnectedDeviceCallbackCls != nullptr,
                   ChipLogError(Controller, "Could not find GetConnectedDeviceCallback class"));
    JniClass getConnectedDeviceCallbackJniCls(getConnectedDeviceCallbackCls);

    jmethodID successMethod;
    JniReferences::GetInstance().FindMethod(env, javaCallback, "onDeviceConnected", "(J)V", &successMethod);
    VerifyOrReturn(successMethod != nullptr, ChipLogError(Controller, "Could not find onDeviceConnected method"));

    static_assert(sizeof(jlong) >= sizeof(void *), "Need to store a pointer in a Java handle");
    env->CallVoidMethod(javaCallback, successMethod, reinterpret_cast<jlong>(device));
}

void GetConnectedDeviceCallback::OnDeviceConnectionFailureFn(void * context, NodeId nodeId, CHIP_ERROR error)
{
    JNIEnv * env         = JniReferences::GetInstance().GetEnvForCurrentThread();
    auto * self          = static_cast<GetConnectedDeviceCallback *>(context);
    jobject javaCallback = self->mJavaCallbackRef;

    jclass getConnectedDeviceCallbackCls = nullptr;
    JniReferences::GetInstance().GetClassRef(env, "chip/devicecontroller/GetConnectedDeviceCallbackJni$GetConnectedDeviceCallback",
                                             getConnectedDeviceCallbackCls);
    VerifyOrReturn(getConnectedDeviceCallbackCls != nullptr,
                   ChipLogError(Controller, "Could not find GetConnectedDeviceCallback class"));
    JniClass getConnectedDeviceCallbackJniCls(getConnectedDeviceCallbackCls);

    jmethodID failureMethod;
    JniReferences::GetInstance().FindMethod(env, javaCallback, "onConnectionFailure", "(JLjava/lang/Exception;)V", &failureMethod);
    VerifyOrReturn(failureMethod != nullptr, ChipLogError(Controller, "Could not find onConnectionFailure method"));

    // Create the exception to return.
    jclass controllerExceptionCls;
    CHIP_ERROR err = JniReferences::GetInstance().GetClassRef(env, "chip/devicecontroller/ChipDeviceControllerException",
                                                              controllerExceptionCls);
    VerifyOrReturn(err == CHIP_NO_ERROR, ChipLogError(Controller, "Could not find exception type for onConnectionFailure"));
    JniClass controllerExceptionJniCls(controllerExceptionCls);

    jmethodID exceptionConstructor = env->GetMethodID(controllerExceptionCls, "<init>", "(ILjava/lang/String;)V");
    jobject exception = env->NewObject(controllerExceptionCls, exceptionConstructor, error, env->NewStringUTF(ErrorStr(error)));

    env->CallVoidMethod(javaCallback, failureMethod, nodeId, exception);
}