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
25public final class TargetPackageInfoGetterTask extends
26        AsyncTask<String, Void, PackageInfo> {
27    private static final int MAX_CACHE_ENTRIES = 64; // arbitrary
28    private static final LruCache<String, PackageInfo> sCache =
29            new LruCache<String, PackageInfo>(MAX_CACHE_ENTRIES);
30
31    public static PackageInfo getCachedPackageInfo(final String packageName) {
32        if (null == packageName) return null;
33        return sCache.get(packageName);
34    }
35
36    public static void removeCachedPackageInfo(final String packageName) {
37        sCache.remove(packageName);
38    }
39
40    public interface OnTargetPackageInfoKnownListener {
41        public void onTargetPackageInfoKnown(final PackageInfo info);
42    }
43
44    private Context mContext;
45    private final OnTargetPackageInfoKnownListener mListener;
46
47    public TargetPackageInfoGetterTask(final Context context,
48            final OnTargetPackageInfoKnownListener listener) {
49        mContext = context;
50        mListener = listener;
51    }
52
53    @Override
54    protected PackageInfo doInBackground(final String... packageName) {
55        final PackageManager pm = mContext.getPackageManager();
56        mContext = null; // Bazooka-powered anti-leak device
57        try {
58            final PackageInfo packageInfo = pm.getPackageInfo(packageName[0], 0 /* flags */);
59            sCache.put(packageName[0], packageInfo);
60            return packageInfo;
61        } catch (android.content.pm.PackageManager.NameNotFoundException e) {
62            return null;
63        }
64    }
65
66    @Override
67    protected void onPostExecute(final PackageInfo info) {
68        mListener.onTargetPackageInfoKnown(info);
69    }
70}
71