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      1 /*
      2  * Copyright (C) 2012 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.inputmethod.latin.utils;
     18 
     19 import android.content.Context;
     20 import android.content.pm.PackageInfo;
     21 import android.content.pm.PackageManager;
     22 import android.os.AsyncTask;
     23 import android.util.LruCache;
     24 
     25 import com.android.inputmethod.compat.AppWorkaroundsUtils;
     26 
     27 public final class TargetPackageInfoGetterTask extends
     28         AsyncTask<String, Void, PackageInfo> {
     29     private static final int MAX_CACHE_ENTRIES = 64; // arbitrary
     30     private static final LruCache<String, PackageInfo> sCache = new LruCache<>(MAX_CACHE_ENTRIES);
     31 
     32     public static PackageInfo getCachedPackageInfo(final String packageName) {
     33         if (null == packageName) return null;
     34         return sCache.get(packageName);
     35     }
     36 
     37     public static void removeCachedPackageInfo(final String packageName) {
     38         sCache.remove(packageName);
     39     }
     40 
     41     private Context mContext;
     42     private final AsyncResultHolder<AppWorkaroundsUtils> mResult;
     43 
     44     public TargetPackageInfoGetterTask(final Context context,
     45             final AsyncResultHolder<AppWorkaroundsUtils> result) {
     46         mContext = context;
     47         mResult = result;
     48     }
     49 
     50     @Override
     51     protected PackageInfo doInBackground(final String... packageName) {
     52         final PackageManager pm = mContext.getPackageManager();
     53         mContext = null; // Bazooka-powered anti-leak device
     54         try {
     55             final PackageInfo packageInfo = pm.getPackageInfo(packageName[0], 0 /* flags */);
     56             sCache.put(packageName[0], packageInfo);
     57             return packageInfo;
     58         } catch (android.content.pm.PackageManager.NameNotFoundException e) {
     59             return null;
     60         }
     61     }
     62 
     63     @Override
     64     protected void onPostExecute(final PackageInfo info) {
     65         mResult.set(new AppWorkaroundsUtils(info));
     66     }
     67 }
     68