content: /*
   * 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 android.content.res;
  
  import android.annotation.UnsupportedAppUsage;
  import android.content.pm.ActivityInfo.Config;
  
  /**
   * A Cache class which can be used to cache resource objects that are easy to clone but more
   * expensive to inflate.
   *
   * @hide For internal use only.
   */
  public class ConfigurationBoundResourceCache<T> extends ThemedResourceCache<ConstantState<T>> {
      /**
       * 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
       */
      public T getInstance(long key, Resources resources, Resources.Theme theme) {
          final ConstantState<T> entry = get(key, theme);
          if (entry != null) {
              return entry.newInstance(resources, theme);
          }
  
          return null;
      }
  
      @Override
      public boolean shouldInvalidateEntry(ConstantState<T> entry, @Config int configChanges) {
          return Configuration.needNewResources(configChanges, entry.getChangingConfigurations());
      }
  }
  