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 com.android.messaging.util;
18
19import android.content.Context;
20import android.content.pm.PackageInfo;
21import android.content.pm.PackageManager.NameNotFoundException;
22
23import java.util.Locale;
24
25public final class VersionUtil {
26    private static final Object sLock = new Object();
27    private static VersionUtil sInstance;
28    private final String mSimpleVersionName;
29    private final int mVersionCode;
30
31    public static VersionUtil getInstance(final Context context) {
32        synchronized (sLock) {
33            if (sInstance == null) {
34                sInstance = new VersionUtil(context);
35            }
36        }
37        return sInstance;
38    }
39
40    private VersionUtil(final Context context) {
41        int versionCode;
42        try {
43            PackageInfo pi = context.getPackageManager().getPackageInfo(
44                    context.getPackageName(), 0);
45            versionCode = pi.versionCode;
46        } catch (final NameNotFoundException exception) {
47            Assert.fail("couldn't get package info " + exception);
48            versionCode = -1;
49        }
50        mVersionCode = versionCode;
51        final int majorBuildNumber = versionCode / 1000;
52        // Use US locale to format version number so that other language characters don't
53        // show up in version string.
54        mSimpleVersionName = String.format(Locale.US, "%d.%d.%03d",
55                majorBuildNumber / 10000,
56                (majorBuildNumber / 1000) % 10,
57                majorBuildNumber % 1000);
58    }
59
60    public int getVersionCode() {
61        return mVersionCode;
62    }
63
64    public String getSimpleName() {
65        return mSimpleVersionName;
66    }
67}
68