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 */
16package android.content.pm.split;
17
18import static android.content.pm.PackageManager.INSTALL_FAILED_INVALID_APK;
19import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_NOT_APK;
20
21import android.content.pm.PackageParser;
22import android.content.pm.PackageParser.PackageParserException;
23import android.content.pm.PackageParser.ParseFlags;
24import android.content.res.ApkAssets;
25import android.content.res.AssetManager;
26import android.os.Build;
27
28import com.android.internal.util.ArrayUtils;
29
30import libcore.io.IoUtils;
31
32import java.io.IOException;
33
34/**
35 * Loads the base and split APKs into a single AssetManager.
36 * @hide
37 */
38public class DefaultSplitAssetLoader implements SplitAssetLoader {
39    private final String mBaseCodePath;
40    private final String[] mSplitCodePaths;
41    private final @ParseFlags int mFlags;
42    private AssetManager mCachedAssetManager;
43
44    public DefaultSplitAssetLoader(PackageParser.PackageLite pkg, @ParseFlags int flags) {
45        mBaseCodePath = pkg.baseCodePath;
46        mSplitCodePaths = pkg.splitCodePaths;
47        mFlags = flags;
48    }
49
50    private static ApkAssets loadApkAssets(String path, @ParseFlags int flags)
51            throws PackageParserException {
52        if ((flags & PackageParser.PARSE_MUST_BE_APK) != 0 && !PackageParser.isApkPath(path)) {
53            throw new PackageParserException(INSTALL_PARSE_FAILED_NOT_APK,
54                    "Invalid package file: " + path);
55        }
56
57        try {
58            return ApkAssets.loadFromPath(path);
59        } catch (IOException e) {
60            throw new PackageParserException(INSTALL_FAILED_INVALID_APK,
61                    "Failed to load APK at path " + path, e);
62        }
63    }
64
65    @Override
66    public AssetManager getBaseAssetManager() throws PackageParserException {
67        if (mCachedAssetManager != null) {
68            return mCachedAssetManager;
69        }
70
71        ApkAssets[] apkAssets = new ApkAssets[(mSplitCodePaths != null
72                ? mSplitCodePaths.length : 0) + 1];
73
74        // Load the base.
75        int splitIdx = 0;
76        apkAssets[splitIdx++] = loadApkAssets(mBaseCodePath, mFlags);
77
78        // Load any splits.
79        if (!ArrayUtils.isEmpty(mSplitCodePaths)) {
80            for (String apkPath : mSplitCodePaths) {
81                apkAssets[splitIdx++] = loadApkAssets(apkPath, mFlags);
82            }
83        }
84
85        AssetManager assets = new AssetManager();
86        assets.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
87                Build.VERSION.RESOURCES_SDK_INT);
88        assets.setApkAssets(apkAssets, false /*invalidateCaches*/);
89
90        mCachedAssetManager = assets;
91        return mCachedAssetManager;
92    }
93
94    @Override
95    public AssetManager getSplitAssetManager(int splitIdx) throws PackageParserException {
96        return getBaseAssetManager();
97    }
98
99    @Override
100    public void close() throws Exception {
101        IoUtils.closeQuietly(mCachedAssetManager);
102    }
103}
104