content: /*
   * Copyright (C) 2015 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.UnsupportedAppUsage;
  import android.graphics.drawable.Drawable;
  
  /**
   * Class which can be used to cache Drawable resources against a theme.
   */
  class DrawableCache extends ThemedResourceCache<Drawable.ConstantState> {
      /**
       * If the resource is cached, creates and returns a new instance of it.
       *
       * @param key a key that uniquely identifies the drawable resource
       * @param resources a Resources object from which to create new instances.
       * @param theme the theme where the resource will be used
       * @return a new instance of the resource, or {@code null} if not in
       *         the cache
       */
      @UnsupportedAppUsage
      public Drawable getInstance(long key, Resources resources, Resources.Theme theme) {
          final Drawable.ConstantState entry = get(key, theme);
          if (entry != null) {
              return entry.newDrawable(resources, theme);
          }
  
          return null;
      }
  
      @Override
      public boolean shouldInvalidateEntry(Drawable.ConstantState entry, int configChanges) {
          return Configuration.needNewResources(configChanges, entry.getChangingConfigurations());
      }
  }
  