1 files changed, 197 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/wifi/WifiSettingsStore.java b/services/core/java/com/android/server/wifi/WifiSettingsStore.java
new file mode 100644
index 0000000..3ff8061
--- /dev/null
+++ b/services/core/java/com/android/server/wifi/WifiSettingsStore.java
@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2013 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.wifi;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.provider.Settings;
+
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+
+/* Tracks persisted settings for Wi-Fi and airplane mode interaction */
+final class WifiSettingsStore {
+    /* Values tracked in Settings.Global.WIFI_ON */
+    private static final int WIFI_DISABLED                      = 0;
+    private static final int WIFI_ENABLED                       = 1;
+    /* Wifi enabled while in airplane mode */
+    private static final int WIFI_ENABLED_AIRPLANE_OVERRIDE     = 2;
+    /* Wifi disabled due to airplane mode on */
+    private static final int WIFI_DISABLED_AIRPLANE_ON          = 3;
+
+    /* Persisted state that tracks the wifi & airplane interaction from settings */
+    private int mPersistWifiState = WIFI_DISABLED;
+    /* Tracks current airplane mode state */
+    private boolean mAirplaneModeOn = false;
+
+    /* Tracks the setting of scan being available even when wi-fi is turned off
+     */
+    private boolean mScanAlwaysAvailable;
+
+    private final Context mContext;
+
+    /* Tracks if we have checked the saved wi-fi state after boot */
+    private boolean mCheckSavedStateAtBoot = false;
+
+    WifiSettingsStore(Context context) {
+        mContext = context;
+        mAirplaneModeOn = getPersistedAirplaneModeOn();
+        mPersistWifiState = getPersistedWifiState();
+        mScanAlwaysAvailable = getPersistedScanAlwaysAvailable();
+    }
+
+    synchronized boolean isWifiToggleEnabled() {
+        if (!mCheckSavedStateAtBoot) {
+            mCheckSavedStateAtBoot = true;
+            if (testAndClearWifiSavedState()) return true;
+        }
+
+        if (mAirplaneModeOn) {
+            return mPersistWifiState == WIFI_ENABLED_AIRPLANE_OVERRIDE;
+        } else {
+            return mPersistWifiState != WIFI_DISABLED;
+        }
+    }
+
+    /**
+     * Returns true if airplane mode is currently on.
+     * @return {@code true} if airplane mode is on.
+     */
+    synchronized boolean isAirplaneModeOn() {
+       return mAirplaneModeOn;
+    }
+
+    synchronized boolean isScanAlwaysAvailable() {
+        return mScanAlwaysAvailable;
+    }
+
+    synchronized boolean handleWifiToggled(boolean wifiEnabled) {
+        // Can Wi-Fi be toggled in airplane mode ?
+        if (mAirplaneModeOn && !isAirplaneToggleable()) {
+            return false;
+        }
+
+        if (wifiEnabled) {
+            if (mAirplaneModeOn) {
+                persistWifiState(WIFI_ENABLED_AIRPLANE_OVERRIDE);
+            } else {
+                persistWifiState(WIFI_ENABLED);
+            }
+        } else {
+            // When wifi state is disabled, we do not care
+            // if airplane mode is on or not. The scenario of
+            // wifi being disabled due to airplane mode being turned on
+            // is handled handleAirplaneModeToggled()
+            persistWifiState(WIFI_DISABLED);
+        }
+        return true;
+    }
+
+    synchronized boolean handleAirplaneModeToggled() {
+        // Is Wi-Fi sensitive to airplane mode changes ?
+        if (!isAirplaneSensitive()) {
+            return false;
+        }
+
+        mAirplaneModeOn = getPersistedAirplaneModeOn();
+        if (mAirplaneModeOn) {
+            // Wifi disabled due to airplane on
+            if (mPersistWifiState == WIFI_ENABLED) {
+                persistWifiState(WIFI_DISABLED_AIRPLANE_ON);
+            }
+        } else {
+            /* On airplane mode disable, restore wifi state if necessary */
+            if (testAndClearWifiSavedState() ||
+                    mPersistWifiState == WIFI_ENABLED_AIRPLANE_OVERRIDE) {
+                persistWifiState(WIFI_ENABLED);
+            }
+        }
+        return true;
+    }
+
+    synchronized void handleWifiScanAlwaysAvailableToggled() {
+        mScanAlwaysAvailable = getPersistedScanAlwaysAvailable();
+    }
+
+    void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        pw.println("mPersistWifiState " + mPersistWifiState);
+        pw.println("mAirplaneModeOn " + mAirplaneModeOn);
+    }
+
+    private void persistWifiState(int state) {
+        final ContentResolver cr = mContext.getContentResolver();
+        mPersistWifiState = state;
+        Settings.Global.putInt(cr, Settings.Global.WIFI_ON, state);
+    }
+
+    /* Does Wi-Fi need to be disabled when airplane mode is on ? */
+    private boolean isAirplaneSensitive() {
+        String airplaneModeRadios = Settings.Global.getString(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_RADIOS);
+        return airplaneModeRadios == null
+                || airplaneModeRadios.contains(Settings.Global.RADIO_WIFI);
+    }
+
+    /* Is Wi-Fi allowed to be re-enabled while airplane mode is on ? */
+    private boolean isAirplaneToggleable() {
+        String toggleableRadios = Settings.Global.getString(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        return toggleableRadios != null
+                && toggleableRadios.contains(Settings.Global.RADIO_WIFI);
+    }
+
+     /* After a reboot, we restore wi-fi to be on if it was turned off temporarily for tethering.
+      * The settings app tracks the saved state, but the framework has to check it at boot to
+      * make sure the wi-fi is turned on in case it was turned off for the purpose of tethering.
+      *
+      * Note that this is not part of the regular WIFI_ON setting because this only needs to
+      * be controlled through the settings app and not the Wi-Fi public API.
+      */
+    private boolean testAndClearWifiSavedState() {
+        final ContentResolver cr = mContext.getContentResolver();
+        int wifiSavedState = 0;
+        try {
+            wifiSavedState = Settings.Global.getInt(cr, Settings.Global.WIFI_SAVED_STATE);
+            if(wifiSavedState == 1)
+                Settings.Global.putInt(cr, Settings.Global.WIFI_SAVED_STATE, 0);
+        } catch (Settings.SettingNotFoundException e) {
+            ;
+        }
+        return (wifiSavedState == 1);
+    }
+
+    private int getPersistedWifiState() {
+        final ContentResolver cr = mContext.getContentResolver();
+        try {
+            return Settings.Global.getInt(cr, Settings.Global.WIFI_ON);
+        } catch (Settings.SettingNotFoundException e) {
+            Settings.Global.putInt(cr, Settings.Global.WIFI_ON, WIFI_DISABLED);
+            return WIFI_DISABLED;
+        }
+    }
+
+    private boolean getPersistedAirplaneModeOn() {
+        return Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_ON, 0) == 1;
+    }
+
+    private boolean getPersistedScanAlwaysAvailable() {
+        return Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE,
+                0) == 1;
+    }
+}