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/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
package com.android.server;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.UserHandle;
import android.util.SparseArray;
import java.util.HashMap;
import java.util.WeakHashMap;
/**
* TODO: This should be better integrated into the system so it doesn't need
* special calls from the activity manager to clear it.
*/
public final class AttributeCache {
private static AttributeCache sInstance = null;
private final Context mContext;
private final WeakHashMap<String, Package> mPackages =
new WeakHashMap<String, Package>();
private final Configuration mConfiguration = new Configuration();
public final static class Package {
public final Context context;
private final SparseArray<HashMap<int[], Entry>> mMap
= new SparseArray<HashMap<int[], Entry>>();
public Package(Context c) {
context = c;
}
}
public final static class Entry {
public final Context context;
public final TypedArray array;
public Entry(Context c, TypedArray ta) {
context = c;
array = ta;
}
}
public static void init(Context context) {
if (sInstance == null) {
sInstance = new AttributeCache(context);
}
}
public static AttributeCache instance() {
return sInstance;
}
public AttributeCache(Context context) {
mContext = context;
}
public void removePackage(String packageName) {
synchronized (this) {
mPackages.remove(packageName);
}
}
public void updateConfiguration(Configuration config) {
synchronized (this) {
int changes = mConfiguration.updateFrom(config);
if ((changes & ~(ActivityInfo.CONFIG_FONT_SCALE |
ActivityInfo.CONFIG_KEYBOARD_HIDDEN |
ActivityInfo.CONFIG_ORIENTATION)) != 0) {
// The configurations being masked out are ones that commonly
// change so we don't want flushing the cache... all others
// will flush the cache.
mPackages.clear();
}
}
}
public Entry get(String packageName, int resId, int[] styleable, int userId) {
synchronized (this) {
Package pkg = mPackages.get(packageName);
HashMap<int[], Entry> map = null;
Entry ent = null;
if (pkg != null) {
map = pkg.mMap.get(resId);
if (map != null) {
ent = map.get(styleable);
if (ent != null) {
return ent;
}
}
} else {
Context context;
try {
context = mContext.createPackageContextAsUser(packageName, 0,
new UserHandle(userId));
if (context == null) {
return null;
}
} catch (PackageManager.NameNotFoundException e) {
return null;
}
pkg = new Package(context);
mPackages.put(packageName, pkg);
}
if (map == null) {
map = new HashMap<int[], Entry>();
pkg.mMap.put(resId, map);
}
try {
ent = new Entry(pkg.context,
pkg.context.obtainStyledAttributes(resId, styleable));
map.put(styleable, ent);
} catch (Resources.NotFoundException e) {
return null;
}
return ent;
}
}
}
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