| /* |
| * Copyright (C) 2021 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 androidx.window.extensions; |
| |
| import android.app.ActivityThread; |
| import android.content.Context; |
| |
| import androidx.annotation.NonNull; |
| import androidx.window.extensions.embedding.ActivityEmbeddingComponent; |
| import androidx.window.extensions.embedding.SplitController; |
| import androidx.window.extensions.layout.WindowLayoutComponent; |
| import androidx.window.extensions.layout.WindowLayoutComponentImpl; |
| |
| /** |
| * The reference implementation of {@link WindowExtensions} that implements the initial API version. |
| */ |
| public class WindowExtensionsImpl implements WindowExtensions { |
| |
| private final Object mLock = new Object(); |
| private volatile WindowLayoutComponent mWindowLayoutComponent; |
| private volatile SplitController mSplitController; |
| |
| @Override |
| public int getVendorApiLevel() { |
| return 1; |
| } |
| |
| /** |
| * Returns a reference implementation of {@link WindowLayoutComponent} if available, |
| * {@code null} otherwise. The implementation must match the API level reported in |
| * {@link WindowExtensions#getWindowLayoutComponent()}. |
| * @return {@link WindowLayoutComponent} OEM implementation |
| */ |
| @Override |
| public WindowLayoutComponent getWindowLayoutComponent() { |
| if (mWindowLayoutComponent == null) { |
| synchronized (mLock) { |
| if (mWindowLayoutComponent == null) { |
| Context context = ActivityThread.currentApplication(); |
| mWindowLayoutComponent = new WindowLayoutComponentImpl(context); |
| } |
| } |
| } |
| return mWindowLayoutComponent; |
| } |
| |
| /** |
| * Returns a reference implementation of {@link ActivityEmbeddingComponent} if available, |
| * {@code null} otherwise. The implementation must match the API level reported in |
| * {@link WindowExtensions#getWindowLayoutComponent()}. |
| * @return {@link ActivityEmbeddingComponent} OEM implementation. |
| */ |
| @NonNull |
| public ActivityEmbeddingComponent getActivityEmbeddingComponent() { |
| if (mSplitController == null) { |
| synchronized (mLock) { |
| if (mSplitController == null) { |
| mSplitController = new SplitController(); |
| } |
| } |
| } |
| return mSplitController; |
| } |
| } |