/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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
 */
package com.android.ims.internal;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.telecom.CameraCapabilities;
import android.telecom.Connection;
import android.telecom.VideoProfile;
import android.view.Surface;
public abstract class ImsVideoCallProvider {
    private static final int MSG_SET_CALLBACK = 1;
    private static final int MSG_SET_CAMERA = 2;
    private static final int MSG_SET_PREVIEW_SURFACE = 3;
    private static final int MSG_SET_DISPLAY_SURFACE = 4;
    private static final int MSG_SET_DEVICE_ORIENTATION = 5;
    private static final int MSG_SET_ZOOM = 6;
    private static final int MSG_SEND_SESSION_MODIFY_REQUEST = 7;
    private static final int MSG_SEND_SESSION_MODIFY_RESPONSE = 8;
    private static final int MSG_REQUEST_CAMERA_CAPABILITIES = 9;
    private static final int MSG_REQUEST_CALL_DATA_USAGE = 10;
    private static final int MSG_SET_PAUSE_IMAGE = 11;
    private final ImsVideoCallProviderBinder mBinder;
    private IImsVideoCallCallback mCallback;
    /**
     * Default handler used to consolidate binder method calls onto a single thread.
     */
    private final Handler mProviderHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_SET_CALLBACK:
                    mCallback = (IImsVideoCallCallback) msg.obj;
                    break;
                case MSG_SET_CAMERA:
                    onSetCamera((String) msg.obj);
                    break;
                case MSG_SET_PREVIEW_SURFACE:
                    onSetPreviewSurface((Surface) msg.obj);
                    break;
                case MSG_SET_DISPLAY_SURFACE:
                    onSetDisplaySurface((Surface) msg.obj);
                    break;
                case MSG_SET_DEVICE_ORIENTATION:
                    onSetDeviceOrientation(msg.arg1);
                    break;
                case MSG_SET_ZOOM:
                    onSetZoom((Float) msg.obj);
                    break;
                case MSG_SEND_SESSION_MODIFY_REQUEST:
                    onSendSessionModifyRequest((VideoProfile) msg.obj);
                    break;
                case MSG_SEND_SESSION_MODIFY_RESPONSE:
                    onSendSessionModifyResponse((VideoProfile) msg.obj);
                    break;
                case MSG_REQUEST_CAMERA_CAPABILITIES:
                    onRequestCameraCapabilities();
                    break;
                case MSG_REQUEST_CALL_DATA_USAGE:
                    onRequestCallDataUsage();
                    break;
                case MSG_SET_PAUSE_IMAGE:
                    onSetPauseImage((String) msg.obj);
                    break;
                default:
                    break;
            }
        }
    };
    /**
     * IImsVideoCallProvider stub implementation.
     */
    private final class ImsVideoCallProviderBinder extends IImsVideoCallProvider.Stub {
        public void setCallback(IImsVideoCallCallback callback) {
            mProviderHandler.obtainMessage(MSG_SET_CALLBACK, callback).sendToTarget();
        }
        public void setCamera(String cameraId) {
            mProviderHandler.obtainMessage(MSG_SET_CAMERA, cameraId).sendToTarget();
        }
        public void setPreviewSurface(Surface surface) {
            mProviderHandler.obtainMessage(MSG_SET_PREVIEW_SURFACE, surface).sendToTarget();
        }
        public void setDisplaySurface(Surface surface) {
            mProviderHandler.obtainMessage(MSG_SET_DISPLAY_SURFACE, surface).sendToTarget();
        }
        public void setDeviceOrientation(int rotation) {
            mProviderHandler.obtainMessage(MSG_SET_DEVICE_ORIENTATION, rotation).sendToTarget();
        }
        public void setZoom(float value) {
            mProviderHandler.obtainMessage(MSG_SET_ZOOM, value).sendToTarget();
        }
        public void sendSessionModifyRequest(VideoProfile requestProfile) {
            mProviderHandler.obtainMessage(
                    MSG_SEND_SESSION_MODIFY_REQUEST, requestProfile).sendToTarget();
        }
        public void sendSessionModifyResponse(VideoProfile responseProfile) {
            mProviderHandler.obtainMessage(
                    MSG_SEND_SESSION_MODIFY_RESPONSE, responseProfile).sendToTarget();
        }
        public void requestCameraCapabilities() {
            mProviderHandler.obtainMessage(MSG_REQUEST_CAMERA_CAPABILITIES).sendToTarget();
        }
        public void requestCallDataUsage() {
            mProviderHandler.obtainMessage(MSG_REQUEST_CALL_DATA_USAGE).sendToTarget();
        }
        public void setPauseImage(String uri) {
            mProviderHandler.obtainMessage(MSG_SET_PAUSE_IMAGE, uri).sendToTarget();
        }
    }
    public ImsVideoCallProvider() {
        mBinder = new ImsVideoCallProviderBinder();
    }
    /**
     * Returns binder object which can be used across IPC methods.
     */
    public final IImsVideoCallProvider getInterface() {
        return mBinder;
    }
    /** @see Connection.VideoProvider#onSetCamera */
    public abstract void onSetCamera(String cameraId);
    /** @see Connection.VideoProvider#onSetPreviewSurface */
    public abstract void onSetPreviewSurface(Surface surface);
    /** @see Connection.VideoProvider#onSetDisplaySurface */
    public abstract void onSetDisplaySurface(Surface surface);
    /** @see Connection.VideoProvider#onSetDeviceOrientation */
    public abstract void onSetDeviceOrientation(int rotation);
    /** @see Connection.VideoProvider#onSetZoom */
    public abstract void onSetZoom(float value);
    /** @see Connection.VideoProvider#onSendSessionModifyRequest */
    public abstract void onSendSessionModifyRequest(VideoProfile requestProfile);
    /** @see Connection.VideoProvider#onSendSessionModifyResponse */
    public abstract void onSendSessionModifyResponse(VideoProfile responseProfile);
    /** @see Connection.VideoProvider#onRequestCameraCapabilities */
    public abstract void onRequestCameraCapabilities();
    /** @see Connection.VideoProvider#onRequestCallDataUsage */
    public abstract void onRequestCallDataUsage();
    /** @see Connection.VideoProvider#onSetPauseImage */
    public abstract void onSetPauseImage(String uri);
    /** @see Connection.VideoProvider#receiveSessionModifyRequest */
    public void receiveSessionModifyRequest(VideoProfile VideoProfile) {
        if (mCallback != null) {
            try {
                mCallback.receiveSessionModifyRequest(VideoProfile);
            } catch (RemoteException ignored) {
            }
        }
    }
    /** @see Connection.VideoProvider#receiveSessionModifyResponse */
    public void receiveSessionModifyResponse(
            int status, VideoProfile requestedProfile, VideoProfile responseProfile) {
        if (mCallback != null) {
            try {
                mCallback.receiveSessionModifyResponse(status, requestedProfile, responseProfile);
            } catch (RemoteException ignored) {
            }
        }
    }
    /** @see Connection.VideoProvider#handleCallSessionEvent */
    public void handleCallSessionEvent(int event) {


Answer:         if (mCallback != null) {