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      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 
     41     public static DelegateManager<AssetManager_Delegate> getDelegateManager() {
     42         return sManager;
     43     }
     44 
     45     // ---- delegate methods. ----
     46 
     47     @LayoutlibDelegate
     48     /*package*/ static long nativeCreate() {
     49         AssetManager_Delegate delegate = new AssetManager_Delegate();
     50         return sManager.addNewDelegate(delegate);
     51     }
     52 
     53     @LayoutlibDelegate
     54     /*package*/ static void nativeDestroy(long ptr) {
     55         sManager.removeJavaReferenceFor(ptr);
     56     }
     57 
     58     @LayoutlibDelegate
     59     public static InputStream open(AssetManager mgr, String fileName) throws IOException {
     60         return mgr.open_Original(fileName);
     61     }
     62 
     63     @LayoutlibDelegate
     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
     73     /*package*/ static long nativeThemeCreate(long ptr) {
     74         return Resources_Theme_Delegate.getDelegateManager()
     75                 .addNewDelegate(new Resources_Theme_Delegate());
     76     }
     77 
     78     @LayoutlibDelegate
     79     /*package*/ static void nativeThemeDestroy(long theme) {
     80         Resources_Theme_Delegate.getDelegateManager().removeJavaReferenceFor(theme);
     81     }
     82 
     83     @LayoutlibDelegate
     84     /*package*/ static SparseArray<String> getAssignedPackageIdentifiers(AssetManager manager) {
     85         return new SparseArray<>();
     86     }
     87 
     88     @LayoutlibDelegate
     89     /*package*/ static String[] nativeCreateIdmapsForStaticOverlaysTargetingAndroid() {
     90         // AssetManager requires this not to be null
     91         return new String[0];
     92     }
     93 }
     94