content: /*
   * Copyright (C) 2008 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 android.content.res;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import com.android.ide.common.rendering.api.AssetRepository;
  import com.android.layoutlib.bridge.Bridge;
  
  public class BridgeAssetManager extends AssetManager {
      @Nullable private AssetRepository mAssetRepository;
  
      /**
       * This initializes the static field {@link AssetManager#sSystem} which is used
       * by methods who get a global asset manager using {@link AssetManager#getSystem()}.
       * <p/>
       * They will end up using our bridge asset manager.
       * <p/>
       * {@link Bridge} calls this method after setting up a new bridge.
       */
      public static AssetManager initSystem() {
          if (!(AssetManager.sSystem instanceof BridgeAssetManager)) {
              // Note that AssetManager() creates a system AssetManager and we override it
              // with our BridgeAssetManager.
              AssetManager.sSystem = new BridgeAssetManager();
          }
          return AssetManager.sSystem;
      }
  
      /**
       * Clears the static {@link AssetManager#sSystem} to make sure we don't leave objects
       * around that would prevent us from unloading the library.
       */
      public static void clearSystem() {
          AssetManager.sSystem = null;
      }
  
      public void setAssetRepository(@NonNull AssetRepository assetRepository) {
          mAssetRepository = assetRepository;
      }
  
      /**
       * Clears the AssetRepository reference.
       */
      public void releaseAssetRepository() {
          mAssetRepository = null;
      }
  
      @NonNull
      public AssetRepository getAssetRepository() {
          if (mAssetRepository == null) {
              throw new IllegalStateException("Asset repository is not set");
          }
          return mAssetRepository;
      }
  
      public BridgeAssetManager() {
      }
  }
  