1/*
2 * Copyright (C) 2015 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
17package android.content.res;
18
19import android.graphics.drawable.Drawable;
20
21/**
22 * Class which can be used to cache Drawable resources against a theme.
23 */
24class DrawableCache extends ThemedResourceCache<Drawable.ConstantState> {
25    /**
26     * If the resource is cached, creates and returns a new instance of it.
27     *
28     * @param key a key that uniquely identifies the drawable resource
29     * @param resources a Resources object from which to create new instances.
30     * @param theme the theme where the resource will be used
31     * @return a new instance of the resource, or {@code null} if not in
32     *         the cache
33     */
34    public Drawable getInstance(long key, Resources resources, Resources.Theme theme) {
35        final Drawable.ConstantState entry = get(key, theme);
36        if (entry != null) {
37            return entry.newDrawable(resources, theme);
38        }
39
40        return null;
41    }
42
43    @Override
44    public boolean shouldInvalidateEntry(Drawable.ConstantState entry, int configChanges) {
45        return Configuration.needNewResources(configChanges, entry.getChangingConfigurations());
46    }
47}
48