| /* |
| * 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()); |
| } |
| } |