1 /* 2 ** 3 ** Copyright 2007, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 package com.android.server; 19 20 import android.content.Context; 21 import android.content.pm.ActivityInfo; 22 import android.content.pm.PackageManager; 23 import android.content.res.Configuration; 24 import android.content.res.Resources; 25 import android.content.res.TypedArray; 26 import android.os.UserHandle; 27 import android.util.SparseArray; 28 29 import java.util.HashMap; 30 import java.util.WeakHashMap; 31 32 /** 33 * TODO: This should be better integrated into the system so it doesn't need 34 * special calls from the activity manager to clear it. 35 */ 36 public final class AttributeCache { 37 private static AttributeCache sInstance = null; 38 39 private final Context mContext; 40 private final SparseArray<WeakHashMap<String, Package>> mPackages = 41 new SparseArray<WeakHashMap<String, Package>>(); 42 private final Configuration mConfiguration = new Configuration(); 43 44 public final static class Package { 45 public final Context context; 46 private final SparseArray<HashMap<int[], Entry>> mMap 47 = new SparseArray<HashMap<int[], Entry>>(); 48 Package(Context c)49 public Package(Context c) { 50 context = c; 51 } 52 } 53 54 public final static class Entry { 55 public final Context context; 56 public final TypedArray array; 57 Entry(Context c, TypedArray ta)58 public Entry(Context c, TypedArray ta) { 59 context = c; 60 array = ta; 61 } 62 } 63 init(Context context)64 public static void init(Context context) { 65 if (sInstance == null) { 66 sInstance = new AttributeCache(context); 67 } 68 } 69 instance()70 public static AttributeCache instance() { 71 return sInstance; 72 } 73 AttributeCache(Context context)74 public AttributeCache(Context context) { 75 mContext = context; 76 } 77 removePackage(String packageName)78 public void removePackage(String packageName) { 79 synchronized (this) { 80 for (int i=0; i<mPackages.size(); i++) { 81 mPackages.valueAt(i).remove(packageName); 82 } 83 } 84 } 85 updateConfiguration(Configuration config)86 public void updateConfiguration(Configuration config) { 87 synchronized (this) { 88 int changes = mConfiguration.updateFrom(config); 89 if ((changes & ~(ActivityInfo.CONFIG_FONT_SCALE | 90 ActivityInfo.CONFIG_KEYBOARD_HIDDEN | 91 ActivityInfo.CONFIG_ORIENTATION)) != 0) { 92 // The configurations being masked out are ones that commonly 93 // change so we don't want flushing the cache... all others 94 // will flush the cache. 95 mPackages.clear(); 96 } 97 } 98 } 99 removeUser(int userId)100 public void removeUser(int userId) { 101 synchronized (this) { 102 mPackages.remove(userId); 103 } 104 } 105 get(int userId, String packageName, int resId, int[] styleable)106 public Entry get(int userId, String packageName, int resId, int[] styleable) { 107 synchronized (this) { 108 WeakHashMap<String, Package> packages = mPackages.get(userId); 109 if (packages == null) { 110 packages = new WeakHashMap<String, Package>(); 111 mPackages.put(userId, packages); 112 } 113 Package pkg = packages.get(packageName); 114 HashMap<int[], Entry> map = null; 115 Entry ent = null; 116 if (pkg != null) { 117 map = pkg.mMap.get(resId); 118 if (map != null) { 119 ent = map.get(styleable); 120 if (ent != null) { 121 return ent; 122 } 123 } 124 } else { 125 Context context; 126 try { 127 context = mContext.createPackageContextAsUser(packageName, 0, 128 new UserHandle(userId)); 129 if (context == null) { 130 return null; 131 } 132 } catch (PackageManager.NameNotFoundException e) { 133 return null; 134 } 135 pkg = new Package(context); 136 packages.put(packageName, pkg); 137 } 138 139 if (map == null) { 140 map = new HashMap<int[], Entry>(); 141 pkg.mMap.put(resId, map); 142 } 143 144 try { 145 ent = new Entry(pkg.context, 146 pkg.context.obtainStyledAttributes(resId, styleable)); 147 map.put(styleable, ent); 148 } catch (Resources.NotFoundException e) { 149 return null; 150 } 151 152 return ent; 153 } 154 } 155 } 156 157