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/*
* Copyright (C) 2021 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.settingslib.wifi;
import static android.os.UserManager.DISALLOW_CONFIG_WIFI;
import android.annotation.NonNull;
import android.content.Context;
import android.os.Bundle;
import android.os.UserManager;
import android.util.SparseArray;
import androidx.annotation.VisibleForTesting;
import java.util.HashMap;
import java.util.Map;
/**
* This is a singleton class for Wi-Fi restrictions caching.
*/
public class WifiRestrictionsCache {
private static final String TAG = "WifiResCache";
/**
* Manages mapping between user ID and corresponding singleton {@link WifiRestrictionsCache}
* object.
*/
@VisibleForTesting
protected static final SparseArray<WifiRestrictionsCache> sInstances = new SparseArray<>();
@VisibleForTesting
protected UserManager mUserManager;
@VisibleForTesting
protected Bundle mUserRestrictions;
@VisibleForTesting
protected final Map<String, Boolean> mRestrictions = new HashMap<>();
/**
* @return an instance of {@link WifiRestrictionsCache} object.
*/
@NonNull
public static WifiRestrictionsCache getInstance(@NonNull Context context) {
final int requestUserId = context.getUserId();
WifiRestrictionsCache cache;
synchronized (sInstances) {
// We have same user context as request.
if (sInstances.indexOfKey(requestUserId) >= 0) {
return sInstances.get(requestUserId);
}
// Request by a new user context.
cache = new WifiRestrictionsCache(context);
sInstances.put(context.getUserId(), cache);
}
return cache;
}
/**
* Removes all the instances.
*/
public static void clearInstance() {
synchronized (sInstances) {
for (int i = 0; i < sInstances.size(); i++) {
int key = sInstances.keyAt(i);
WifiRestrictionsCache cache = sInstances.get(key);
cache.clearRestrictions();
sInstances.remove(key);
}
sInstances.clear();
}
}
/**
* Constructor to create a singleton class for Wi-Fi restrictions cache.
*
* @param context The Context this is associated with.
*/
protected WifiRestrictionsCache(@NonNull Context context) {
mUserManager = context.getSystemService(UserManager.class);
if (mUserManager != null) {
mUserRestrictions = mUserManager.getUserRestrictions();
}
}
/**
* @return the boolean value of the restrictions
*/
public Boolean getRestriction(String key) {
if (mUserRestrictions == null) {
return false;
}
Boolean restriction;
synchronized (mRestrictions) {
if (mRestrictions.containsKey(key)) {
return mRestrictions.get(key);
}
restriction = mUserRestrictions.getBoolean(key);
mRestrictions.put(key, restriction);
}
return restriction;
}
/**
* Removes all the restrictions.
*/
public void clearRestrictions() {
synchronized (mRestrictions) {
mRestrictions.clear();
}
}
/**
* @return Whether the user is allowed to config Wi-Fi.
*/
public Boolean isConfigWifiAllowed() {
return !getRestriction(DISALLOW_CONFIG_WIFI);
}
}
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