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      1 /*
      2  * Copyright (C) 2016 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 com.android.launcher3.shortcuts;
     18 
     19 import android.annotation.TargetApi;
     20 import android.os.Build;
     21 import android.os.UserHandle;
     22 import android.util.LruCache;
     23 
     24 import java.util.HashMap;
     25 import java.util.List;
     26 
     27 /**
     28  * Loads {@link ShortcutInfoCompat}s on demand (e.g. when launcher
     29  * loads for pinned shortcuts and on long-press for dynamic shortcuts), and caches them
     30  * for handful of apps in an LruCache while launcher lives.
     31  */
     32 @TargetApi(Build.VERSION_CODES.N)
     33 public class ShortcutCache {
     34     private static final String TAG = "ShortcutCache";
     35     private static final boolean LOGD = false;
     36 
     37     private static final int CACHE_SIZE = 30; // Max number shortcuts we cache.
     38 
     39     private LruCache<ShortcutKey, ShortcutInfoCompat> mCachedShortcuts;
     40     // We always keep pinned shortcuts in the cache.
     41     private HashMap<ShortcutKey, ShortcutInfoCompat> mPinnedShortcuts;
     42 
     43     public ShortcutCache() {
     44         mCachedShortcuts = new LruCache<>(CACHE_SIZE);
     45         mPinnedShortcuts = new HashMap<>();
     46     }
     47 
     48     /**
     49      * Removes shortcuts from the cache when shortcuts change for a given package.
     50      *
     51      * Returns a map of ids to their evicted shortcuts.
     52      *
     53      * @see android.content.pm.LauncherApps.Callback#onShortcutsChanged(String, List, UserHandle).
     54      */
     55     public void removeShortcuts(List<ShortcutInfoCompat> shortcuts) {
     56         for (ShortcutInfoCompat shortcut : shortcuts) {
     57             ShortcutKey key = ShortcutKey.fromInfo(shortcut);
     58             mCachedShortcuts.remove(key);
     59             mPinnedShortcuts.remove(key);
     60         }
     61     }
     62 
     63     public ShortcutInfoCompat get(ShortcutKey key) {
     64         if (mPinnedShortcuts.containsKey(key)) {
     65             return mPinnedShortcuts.get(key);
     66         }
     67         return mCachedShortcuts.get(key);
     68     }
     69 
     70     public void put(ShortcutKey key, ShortcutInfoCompat shortcut) {
     71         if (shortcut.isPinned()) {
     72             mPinnedShortcuts.put(key, shortcut);
     73         } else {
     74             mCachedShortcuts.put(key, shortcut);
     75         }
     76     }
     77 }
     78