Alan Viverette | 3da604b | 2020-06-10 18:34:39 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.content.res; |
| 18 | |
| 19 | import android.compat.annotation.UnsupportedAppUsage; |
| 20 | import android.content.pm.ActivityInfo.Config; |
| 21 | |
| 22 | /** |
| 23 | * A Cache class which can be used to cache resource objects that are easy to clone but more |
| 24 | * expensive to inflate. |
| 25 | * |
| 26 | * @hide For internal use only. |
| 27 | */ |
| 28 | public class ConfigurationBoundResourceCache<T> extends ThemedResourceCache<ConstantState<T>> { |
| 29 | |
| 30 | @UnsupportedAppUsage |
| 31 | public ConfigurationBoundResourceCache() { |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * If the resource is cached, creates and returns a new instance of it. |
| 36 | * |
| 37 | * @param key a key that uniquely identifies the drawable resource |
| 38 | * @param resources a Resources object from which to create new instances. |
| 39 | * @param theme the theme where the resource will be used |
| 40 | * @return a new instance of the resource, or {@code null} if not in |
| 41 | * the cache |
| 42 | */ |
| 43 | public T getInstance(long key, Resources resources, Resources.Theme theme) { |
| 44 | final ConstantState<T> entry = get(key, theme); |
| 45 | if (entry != null) { |
| 46 | return entry.newInstance(resources, theme); |
| 47 | } |
| 48 | |
| 49 | return null; |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public boolean shouldInvalidateEntry(ConstantState<T> entry, @Config int configChanges) { |
| 54 | return Configuration.needNewResources(configChanges, entry.getChangingConfigurations()); |
| 55 | } |
| 56 | } |