1 /*
2  * Copyright (C) 2014 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 android.content.res;
18 
19 import com.android.layoutlib.bridge.impl.DelegateManager;
20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
21 
22 import android.util.SparseArray;
23 
24 import java.io.IOException;
25 import java.io.InputStream;
26 
27 /**
28  * Delegate used to provide implementation of a select few native methods of {@link AssetManager}
29  * <p/>
30  * Through the layoutlib_create tool, the original native methods of AssetManager have been replaced
31  * by calls to methods of the same name in this delegate class.
32  *
33  */
34 public class AssetManager_Delegate {
35 
36     // ---- delegate manager ----
37 
38     private static final DelegateManager<AssetManager_Delegate> sManager =
39             new DelegateManager<>(AssetManager_Delegate.class);
40 
getDelegateManager()41     public static DelegateManager<AssetManager_Delegate> getDelegateManager() {
42         return sManager;
43     }
44 
45     // ---- delegate methods. ----
46 
47     @LayoutlibDelegate
nativeCreate()48     /*package*/ static long nativeCreate() {
49         AssetManager_Delegate delegate = new AssetManager_Delegate();
50         return sManager.addNewDelegate(delegate);
51     }
52 
53     @LayoutlibDelegate
nativeDestroy(long ptr)54     /*package*/ static void nativeDestroy(long ptr) {
55         sManager.removeJavaReferenceFor(ptr);
56     }
57 
58     @LayoutlibDelegate
open(AssetManager mgr, String fileName)59     public static InputStream open(AssetManager mgr, String fileName) throws IOException {
60         return mgr.open_Original(fileName);
61     }
62 
63     @LayoutlibDelegate
open(AssetManager mgr, String fileName, int accessMode)64     public static InputStream open(AssetManager mgr, String fileName, int accessMode)
65             throws IOException {
66         if (!(mgr instanceof BridgeAssetManager)) {
67             return mgr.open_Original(fileName, accessMode);
68         }
69         return ((BridgeAssetManager) mgr).getAssetRepository().openAsset(fileName, accessMode);
70     }
71 
72     @LayoutlibDelegate
nativeThemeCreate(long ptr)73     /*package*/ static long nativeThemeCreate(long ptr) {
74         return Resources_Theme_Delegate.getDelegateManager()
75                 .addNewDelegate(new Resources_Theme_Delegate());
76     }
77 
78     @LayoutlibDelegate
nativeThemeDestroy(long theme)79     /*package*/ static void nativeThemeDestroy(long theme) {
80         Resources_Theme_Delegate.getDelegateManager().removeJavaReferenceFor(theme);
81     }
82 
83     @LayoutlibDelegate
getAssignedPackageIdentifiers(AssetManager manager)84     /*package*/ static SparseArray<String> getAssignedPackageIdentifiers(AssetManager manager) {
85         return new SparseArray<>();
86     }
87 
88     @LayoutlibDelegate
nativeCreateIdmapsForStaticOverlaysTargetingAndroid()89     /*package*/ static String[] nativeCreateIdmapsForStaticOverlaysTargetingAndroid() {
90         // AssetManager requires this not to be null
91         return new String[0];
92     }
93 }
94