[Settings] Code Refactor

Adjust code structure for maintainance.

Bug: 259611847
Test: auto test
Change-Id: I1fab8d0347f64c01ee768e4bb9ea838a9e7ad4fc

src/com/android/settings/network/ResetNetworkOperationBuilder.java

@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) 2022 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.settings.network;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothManager;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkPolicyManager;
+import android.net.Uri;
+import android.net.VpnManager;
+import android.net.wifi.WifiManager;
+import android.net.wifi.p2p.WifiP2pManager;
+import android.os.Looper;
+import android.os.RecoverySystem;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import com.android.settings.network.apn.ApnSettings;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
+
+/**
+ * A builder for creating a Runnable resetting network configurations.
+ */
+public class ResetNetworkOperationBuilder {
+
+    private Context mContext;
+    private List<Runnable> mResetSequence = new ArrayList<Runnable>();
+
+    /**
+     * Constructor of builder.
+     *
+     * @param context Context
+     */
+    public ResetNetworkOperationBuilder(Context context) {
+        mContext = context;
+    }
+
+    /**
+     * Append a step of resetting ConnectivityManager.
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetConnectivityManager() {
+        attachSystemServiceWork(Context.CONNECTIVITY_SERVICE,
+                (Consumer<ConnectivityManager>) cm -> {
+                        cm.factoryReset();
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting VpnManager.
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetVpnManager() {
+        attachSystemServiceWork(Context.VPN_MANAGEMENT_SERVICE,
+                (Consumer<VpnManager>) vpnManager -> {
+                        vpnManager.factoryReset();
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting WifiManager.
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetWifiManager() {
+        attachSystemServiceWork(Context.WIFI_SERVICE,
+                (Consumer<WifiManager>) wifiManager -> {
+                        wifiManager.factoryReset();
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting WifiP2pManager.
+     * @param callbackLooper looper to support callback from WifiP2pManager
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetWifiP2pManager(Looper callbackLooper) {
+        attachSystemServiceWork(Context.WIFI_P2P_SERVICE,
+                (Consumer<WifiP2pManager>) wifiP2pManager -> {
+                        WifiP2pManager.Channel channel = wifiP2pManager.initialize(
+                                mContext, callbackLooper, null /* listener */);
+                        if (channel != null) {
+                            wifiP2pManager.factoryReset(channel, null /* listener */);
+                        }
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting E-SIM.
+     * @param callerPackage package name of caller
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetEsim(String callerPackage) {
+        resetEsim(callerPackage, null);
+        return this;
+    }
+
+    /**
+     * Append a step of resetting E-SIM.
+     * @param callerPackage package name of caller
+     * @param resultCallback a Consumer<Boolean> dealing with result of resetting eSIM
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetEsim(String callerPackage,
+            Consumer<Boolean> resultCallback) {
+        Runnable runnable = () -> {
+            Boolean wipped = RecoverySystem.wipeEuiccData(mContext, callerPackage);
+            if (resultCallback != null) {
+                resultCallback.accept(wipped);
+            }
+        };
+        mResetSequence.add(runnable);
+        return this;
+    }
+
+    /**
+     * Append a step of resetting TelephonyManager and .
+     * @param subscriptionId of a SIM card
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetTelephonyAndNetworkPolicyManager(
+            int subscriptionId) {
+        final AtomicReference<String> subscriberId = new AtomicReference<String>();
+        attachSystemServiceWork(Context.TELEPHONY_SERVICE,
+                (Consumer<TelephonyManager>) tm -> {
+                        TelephonyManager subIdTm = tm.createForSubscriptionId(subscriptionId);
+                        subscriberId.set(subIdTm.getSubscriberId());
+                        subIdTm.resetSettings();
+                });
+        attachSystemServiceWork(Context.NETWORK_POLICY_SERVICE,
+                (Consumer<NetworkPolicyManager>) policyManager -> {
+                        policyManager.factoryReset(subscriberId.get());
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting BluetoothAdapter.
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetBluetoothManager() {
+        attachSystemServiceWork(Context.BLUETOOTH_SERVICE,
+                (Consumer<BluetoothManager>) btManager -> {
+                        BluetoothAdapter btAdapter = btManager.getAdapter();
+                        if (btAdapter != null) {
+                            btAdapter.clearBluetooth();
+                        }
+                });
+        return this;
+    }
+
+    /**
+     * Append a step of resetting APN configurations.
+     * @param subscriptionId of a SIM card
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetApn(int subscriptionId) {
+        Runnable runnable = () -> {
+            Uri uri = Uri.parse(ApnSettings.RESTORE_CARRIERS_URI);
+
+            if (SubscriptionManager.isUsableSubscriptionId(subscriptionId)) {
+                uri = Uri.withAppendedPath(uri, "subId/" + String.valueOf(subscriptionId));
+            }
+
+            ContentResolver resolver = mContext.getContentResolver();
+            resolver.delete(uri, null, null);
+        };
+        mResetSequence.add(runnable);
+        return this;
+    }
+
+    /**
+     * Construct a Runnable containing all operations appended.
+     * @return Runnable
+     */
+    public Runnable build() {
+        return () -> mResetSequence.forEach(runnable -> runnable.run());
+    }
+
+    protected <T> void attachSystemServiceWork(String serviceName, Consumer<T> serviceAccess) {
+        T service = (T) mContext.getSystemService(serviceName);
+        if (service == null) {
+            return;
+        }
+        Runnable runnable = () -> serviceAccess.accept(service);
+        mResetSequence.add(runnable);
+    }
+}