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 libcore.util.NativeAllocationRegistry_Delegate;
25 
26 /**
27  * Delegate used to provide implementation of a select few native methods of {@link AssetManager}
28  * <p/>
29  * Through the layoutlib_create tool, the original native methods of AssetManager have been replaced
30  * by calls to methods of the same name in this delegate class.
31  *
32  */
33 public class AssetManager_Delegate {
34 
35     // ---- delegate manager ----
36 
37     private static final DelegateManager<AssetManager_Delegate> sManager =
38             new DelegateManager<>(AssetManager_Delegate.class);
39     private static long sFinalizer = -1;
40 
41     // ---- delegate methods. ----
42 
43     @LayoutlibDelegate
nativeCreate()44     /*package*/ static long nativeCreate() {
45         AssetManager_Delegate delegate = new AssetManager_Delegate();
46         return sManager.addNewDelegate(delegate);
47     }
48 
49     @LayoutlibDelegate
nativeDestroy(long ptr)50     /*package*/ static void nativeDestroy(long ptr) {
51         sManager.removeJavaReferenceFor(ptr);
52     }
53 
54     @LayoutlibDelegate
nativeThemeCreate(long ptr)55     /*package*/ static long nativeThemeCreate(long ptr) {
56         return Resources_Theme_Delegate.getDelegateManager()
57                 .addNewDelegate(new Resources_Theme_Delegate());
58     }
59 
60     @LayoutlibDelegate
nativeGetThemeFreeFunction()61     /*package*/ static long nativeGetThemeFreeFunction() {
62         synchronized (AssetManager_Delegate.class) {
63             if (sFinalizer == -1) {
64                 sFinalizer = NativeAllocationRegistry_Delegate.createFinalizer(
65                         Resources_Theme_Delegate.getDelegateManager()::removeJavaReferenceFor);
66             }
67         }
68         return sFinalizer;
69     }
70 
71     @LayoutlibDelegate
getAssignedPackageIdentifiers(AssetManager manager)72     /*package*/ static SparseArray<String> getAssignedPackageIdentifiers(AssetManager manager) {
73         return new SparseArray<>();
74     }
75 
76     @LayoutlibDelegate
getAssignedPackageIdentifiers(AssetManager manager, boolean includeOverlays, boolean includeLoaders)77     /*package*/ static SparseArray<String> getAssignedPackageIdentifiers(AssetManager manager,
78             boolean includeOverlays, boolean includeLoaders) {
79         return new SparseArray<>();
80     }
81 
82     @LayoutlibDelegate
createSystemAssetsInZygoteLocked(boolean reinitialize, String frameworkPath)83     /*package*/ static void createSystemAssetsInZygoteLocked(boolean reinitialize,
84             String frameworkPath) { }
85 }
86