| /* |
| * Copyright 2018 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.media; |
| |
| import static android.media.VolumeProvider2.VOLUME_CONTROL_ABSOLUTE; |
| import static android.media.VolumeProvider2.VOLUME_CONTROL_FIXED; |
| import static android.media.VolumeProvider2.VOLUME_CONTROL_RELATIVE; |
| |
| import android.media.VolumeProvider2; |
| import android.media.update.VolumeProvider2Provider; |
| |
| public class VolumeProvider2Impl implements VolumeProvider2Provider { |
| private final VolumeProvider2 mInstance; |
| private final int mControlType; |
| private final int mMaxVolume; |
| |
| private int mCurrentVolume; |
| private Callback mCallback; |
| |
| public VolumeProvider2Impl(VolumeProvider2 instance, |
| @VolumeProvider2.ControlType int controlType, int maxVolume, int currentVolume) { |
| if (controlType != VOLUME_CONTROL_FIXED && controlType != VOLUME_CONTROL_RELATIVE |
| && controlType != VOLUME_CONTROL_ABSOLUTE) { |
| throw new IllegalArgumentException("wrong controlType " + controlType); |
| } |
| if (maxVolume < 0 || currentVolume < 0) { |
| throw new IllegalArgumentException("volume shouldn't be negative" |
| + ", maxVolume=" + maxVolume + ", currentVolume=" + currentVolume); |
| } |
| if (currentVolume > maxVolume) { |
| throw new IllegalArgumentException("currentVolume shouldn't be greater than maxVolume" |
| + ", maxVolume=" + maxVolume + ", currentVolume=" + currentVolume); |
| } |
| mInstance = instance; |
| mControlType = controlType; |
| mMaxVolume = maxVolume; |
| mCurrentVolume = currentVolume; |
| } |
| |
| @Override |
| public int getControlType_impl() { |
| return mControlType; |
| } |
| |
| @Override |
| public int getMaxVolume_impl() { |
| return mMaxVolume; |
| } |
| |
| @Override |
| public int getCurrentVolume_impl() { |
| return mCurrentVolume; |
| } |
| |
| @Override |
| public void setCurrentVolume_impl(int currentVolume) { |
| if (currentVolume < 0) { |
| throw new IllegalArgumentException("currentVolume shouldn't be negative" |
| + ", currentVolume=" + currentVolume); |
| } |
| mCurrentVolume = currentVolume; |
| if (mCallback != null) { |
| mCallback.onVolumeChanged(mInstance); |
| } |
| } |
| |
| /** |
| * Sets a callback to receive volume changes. |
| */ |
| public void setCallback(Callback callback) { |
| mCallback = callback; |
| } |
| |
| /** |
| * Listens for changes to the volume. |
| */ |
| public static abstract class Callback { |
| public abstract void onVolumeChanged(VolumeProvider2 volumeProvider); |
| } |
| } |