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
17package com.android.inputmethod.latin.utils;
18
19import android.content.Context;
20import android.content.pm.PackageInfo;
21import android.content.pm.PackageManager;
22import android.os.AsyncTask;
23import android.util.LruCache;
24
25import com.android.inputmethod.compat.AppWorkaroundsUtils;
26
27public 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