telephony/gsm/GsmServiceStateTracker.java

/*
 * Copyright (C) 2006 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.internal.telephony.gsm;

import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.os.AsyncResult;
import android.os.Handler;
import android.os.Message;
import android.os.PowerManager;
import android.os.Registrant;
import android.os.RegistrantList;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.provider.Telephony.Intents;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;
import android.text.TextUtils;
import android.util.Config;
import android.util.EventLog;
import android.util.Log;
import android.util.TimeUtils;

import com.android.internal.telephony.CommandException;
import com.android.internal.telephony.CommandsInterface;
import com.android.internal.telephony.DataConnectionTracker;
import com.android.internal.telephony.EventLogTags;
import com.android.internal.telephony.IccCard;
import com.android.internal.telephony.MccTable;
import com.android.internal.telephony.RILConstants;
import com.android.internal.telephony.ServiceStateTracker;
import com.android.internal.telephony.TelephonyIntents;
import com.android.internal.telephony.TelephonyProperties;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

/**
 * {@hide}
 */
final class GsmServiceStateTracker extends ServiceStateTracker {
    static final String LOG_TAG = "GSM";
    static final boolean DBG = true;

    GSMPhone phone;
    GsmCellLocation cellLoc;
    GsmCellLocation newCellLoc;
    int mPreferredNetworkType;
    RestrictedState rs;

    private int gprsState = ServiceState.STATE_OUT_OF_SERVICE;
    private int newGPRSState = ServiceState.STATE_OUT_OF_SERVICE;

    /**
     *  Values correspond to ServiceStateTracker.DATA_ACCESS_ definitions.
     */
    private int networkType = 0;
    private int newNetworkType = 0;

    /**
     * GSM roaming status solely based on TS 27.007 7.2 CREG. Only used by
     * handlePollStateResult to store CREG roaming result.
     */
    private boolean mGsmRoaming = false;

    /**
     * Data roaming status solely based on TS 27.007 10.1.19 CGREG. Only used by
     * handlePollStateResult to store CGREG roaming result.
     */
    private boolean mDataRoaming = false;

    /**
     * Mark when service state is in emergency call only mode
     */
    private boolean mEmergencyOnly = false;
    private boolean mNewEmergencyOnly = false;

    private RegistrantList gprsAttachedRegistrants = new RegistrantList();
    private RegistrantList gprsDetachedRegistrants = new RegistrantList();
    private RegistrantList psRestrictEnabledRegistrants = new RegistrantList();
    private RegistrantList psRestrictDisabledRegistrants = new RegistrantList();

    /**
     * Sometimes we get the NITZ time before we know what country we
     * are in. Keep the time zone information from the NITZ string so
     * we can fix the time zone once know the country.
     */
    private boolean mNeedFixZone = false;
    private int mZoneOffset;
    private boolean mZoneDst;
    private long mZoneTime;
    private boolean mGotCountryCode = false;
    private ContentResolver cr;

    String mSavedTimeZone;
    long mSavedTime;
    long mSavedAtTime;

    /**
     * We can't register for SIM_RECORDS_LOADED immediately because the
     * SIMRecords object may not be instantiated yet.
     */
    private boolean mNeedToRegForSimLoaded;

    /** Started the recheck process after finding gprs should registerd but not. */
    private boolean mStartedGprsRegCheck = false;

    /** Already sent the event-log for no gprs register. */
    private boolean mReportedGprsNoReg = false;

    /**
     * The Notification object given to the NotificationManager.
     */
    private Notification mNotification;

    /** Wake lock used while setting time of day. */
    private PowerManager.WakeLock mWakeLock;
    private static final String WAKELOCK_TAG = "ServiceStateTracker";

    /** Keep track of SPN display rules, so we only broadcast intent if something changes. */
    private String curSpn = null;
    private String curPlmn = null;
    private int curSpnRule = 0;

    /** waiting period before recheck gprs and voice registration. */
    static final int DEFAULT_GPRS_CHECK_PERIOD_MILLIS = 60 * 1000;

    /** Notification type. */
    static final int PS_ENABLED = 1001;            // Access Control blocks data service
    static final int PS_DISABLED = 1002;           // Access Control enables data service
    static final int CS_ENABLED = 1003;            // Access Control blocks all voice/sms service
    static final int CS_DISABLED = 1004;           // Access Control enables all voice/sms service
    static final int CS_NORMAL_ENABLED = 1005;     // Access Control blocks normal voice/sms service
    static final int CS_EMERGENCY_ENABLED = 1006;  // Access Control blocks emergency call service

    /** Notification id. */
    static final int PS_NOTIFICATION = 888;  // Id to update and cancel PS restricted
    static final int CS_NOTIFICATION = 999;  // Id to update and cancel CS restricted

    static final int MAX_NUM_DATA_STATE_READS = 15;

    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_LOCALE_CHANGED)) {
                // update emergency string whenever locale changed
                updateSpnDisplay();
            }
        }
    };

    private ContentObserver mAutoTimeObserver = new ContentObserver(new Handler()) {
        @Override
        public void onChange(boolean selfChange) {
            Log.i("GsmServiceStateTracker", "Auto time state changed");
            revertToNitz();
        }
    };

    public GsmServiceStateTracker(GSMPhone phone) {
        super();

        this.phone = phone;
        cm = phone.mCM;
        ss = new ServiceState();
        newSS = new ServiceState();
        cellLoc = new GsmCellLocation();
        newCellLoc = new GsmCellLocation();
        rs = new RestrictedState();
        mSignalStrength = new SignalStrength();

        PowerManager powerManager =
                (PowerManager)phone.getContext().getSystemService(Context.POWER_SERVICE);
        mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKELOCK_TAG);

        cm.registerForAvailable(this, EVENT_RADIO_AVAILABLE, null);
        cm.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);

        cm.registerForNetworkStateChanged(this, EVENT_NETWORK_STATE_CHANGED, null);
        cm.setOnNITZTime(this, EVENT_NITZ_TIME, null);
        cm.setOnSignalStrengthUpdate(this, EVENT_SIGNAL_STRENGTH_UPDATE, null);
        cm.setOnRestrictedStateChanged(this, EVENT_RESTRICTED_STATE_CHANGED, null);
        cm.registerForSIMReady(this, EVENT_SIM_READY, null);

        // system setting property AIRPLANE_MODE_ON is set in Settings.
        int airplaneMode = Settings.System.getInt(
                phone.getContext().getContentResolver(),
                Settings.System.AIRPLANE_MODE_ON, 0);
        mDesiredPowerState = ! (airplaneMode > 0);

        cr = phone.getContext().getContentResolver();
        cr.registerContentObserver(
                Settings.System.getUriFor(Settings.System.AUTO_TIME), true,
                mAutoTimeObserver);
        setSignalStrengthDefaultValues();
        mNeedToRegForSimLoaded = true;

        // Monitor locale change
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
        phone.getContext().registerReceiver(mIntentReceiver, filter);
    }

    public void dispose() {
        // Unregister for all events.
        cm.unregisterForAvailable(this);
        cm.unregisterForRadioStateChanged(this);
        cm.unregisterForNetworkStateChanged(this);
        cm.unregisterForSIMReady(this);

        phone.mSIMRecords.unregisterForRecordsLoaded(this);
        cm.unSetOnSignalStrengthUpdate(this);
        cm.unSetOnRestrictedStateChanged(this);
        cm.unSetOnNITZTime(this);
        cr.unregisterContentObserver(this.mAutoTimeObserver);
    }

    protected void finalize() {
        if(DBG) Log.d(LOG_TAG, "GsmServiceStateTracker finalized");
    }

    /**
     * Registration point for transition into GPRS attached.
     * @param h handler to notify
     * @param what what code of message when delivered
     * @param obj placed in Message.obj
     */
    void registerForGprsAttached(Handler h, int what, Object obj) {
        Registrant r = new Registrant(h, what, obj);
        gprsAttachedRegistrants.add(r);

        if (gprsState == ServiceState.STATE_IN_SERVICE) {
            r.notifyRegistrant();
        }
    }

    void unregisterForGprsAttached(Handler h) {
        gprsAttachedRegistrants.remove(h);
    }

    void registerForNetworkAttach(Handler h, int what, Object obj) {
        Registrant r = new Registrant(h, what, obj);
        networkAttachedRegistrants.add(r);

        if (ss.getState() == ServiceState.STATE_IN_SERVICE) {
            r.notifyRegistrant();
        }
    }

    void unregisterForNetworkAttach(Handler h) {
        networkAttachedRegistrants.remove(h);
    }

    /**
     * Registration point for transition into GPRS detached.
     * @param h handler to notify
     * @param what what code of message when delivered
     * @param obj placed in Message.obj
     */
    void registerForGprsDetached(Handler h, int what, Object obj) {
        Registrant r = new Registrant(h, what, obj);
        gprsDetachedRegistrants.add(r);

        if (gprsState == ServiceState.STATE_OUT_OF_SERVICE) {
            r.notifyRegistrant();
        }
    }

    void unregisterForGprsDetached(Handler h) {
        gprsDetachedRegistrants.remove(h);
    }

    /**
     * Registration point for transition into packet service restricted zone.
     * @param h handler to notify
     * @param what what code of message when delivered
     * @param obj placed in Message.obj
     */
    void registerForPsRestrictedEnabled(Handler h, int what, Object obj) {
        Log.d(LOG_TAG, "[DSAC DEB] " + "registerForPsRestrictedEnabled ");
        Registrant r = new Registrant(h, what, obj);
        psRestrictEnabledRegistrants.add(r);

        if (rs.isPsRestricted()) {
            r.notifyRegistrant();
        }
    }

    void unregisterForPsRestrictedEnabled(Handler h) {
        psRestrictEnabledRegistrants.remove(h);
    }

    /**
     * Registration point for transition out of packet service restricted zone.
     * @param h handler to notify
     * @param what what code of message when delivered
     * @param obj placed in Message.obj
     */
    void registerForPsRestrictedDisabled(Handler h, int what, Object obj) {
        Log.d(LOG_TAG, "[DSAC DEB] " + "registerForPsRestrictedDisabled ");
        Registrant r = new Registrant(h, what, obj);
        psRestrictDisabledRegistrants.add(r);

        if (rs.isPsRestricted()) {
            r.notifyRegistrant();
        }
    }

    void unregisterForPsRestrictedDisabled(Handler h) {
        psRestrictDisabledRegistrants.remove(h);
    }

    public void handleMessage (Message msg) {
        AsyncResult ar;
        int[] ints;
        String[] strings;
        Message message;

        switch (msg.what) {
            case EVENT_RADIO_AVAILABLE:
                //this is unnecessary
                //setPowerStateToDesired();
                break;

            case EVENT_SIM_READY:
                // The SIM is now ready i.e if it was locked
                // it has been unlocked. At this stage, the radio is already
                // powered on.
                if (mNeedToRegForSimLoaded) {
                    phone.mSIMRecords.registerForRecordsLoaded(this,
                            EVENT_SIM_RECORDS_LOADED, null);
                    mNeedToRegForSimLoaded = false;
                }
                // restore the previous network selection.
                phone.restoreSavedNetworkSelection(null);
                pollState();
                // Signal strength polling stops when radio is off
                queueNextSignalStrengthPoll();
                break;

            case EVENT_RADIO_STATE_CHANGED:
                // This will do nothing in the radio not
                // available case
                setPowerStateToDesired();
                pollState();
                break;

            case EVENT_NETWORK_STATE_CHANGED:
                pollState();
                break;

            case EVENT_GET_SIGNAL_STRENGTH:
                // This callback is called when signal strength is polled
                // all by itself

                if (!(cm.getRadioState().isOn()) || (cm.getRadioState().isCdma())) {
                    // Polling will continue when radio turns back on and not CDMA
                    return;
                }
                ar = (AsyncResult) msg.obj;
                onSignalStrengthResult(ar);
                queueNextSignalStrengthPoll();

                break;

            case EVENT_GET_LOC_DONE:
                ar = (AsyncResult) msg.obj;

                if (ar.exception == null) {
                    String states[] = (String[])ar.result;
                    int lac = -1;
                    int cid = -1;
                    if (states.length >= 3) {
                        try {
                            if (states[1] != null && states[1].length() > 0) {
                                lac = Integer.parseInt(states[1], 16);
                            }
                            if (states[2] != null && states[2].length() > 0) {
                                cid = Integer.parseInt(states[2], 16);
                            }
                        } catch (NumberFormatException ex) {
                            Log.w(LOG_TAG, "error parsing location: " + ex);
                        }
                    }
                    cellLoc.setLacAndCid(lac, cid);
                    phone.notifyLocationChanged();
                }

                // Release any temporary cell lock, which could have been
                // aquired to allow a single-shot location update.
                disableSingleLocationUpdate();
                break;

            case EVENT_POLL_STATE_REGISTRATION:
            case EVENT_POLL_STATE_GPRS:
            case EVENT_POLL_STATE_OPERATOR:
            case EVENT_POLL_STATE_NETWORK_SELECTION_MODE:
                ar = (AsyncResult) msg.obj;

                handlePollStateResult(msg.what, ar);
                break;

            case EVENT_POLL_SIGNAL_STRENGTH:
                // Just poll signal strength...not part of pollState()

                cm.getSignalStrength(obtainMessage(EVENT_GET_SIGNAL_STRENGTH));
                break;

            case EVENT_NITZ_TIME:
                ar = (AsyncResult) msg.obj;

                String nitzString = (String)((Object[])ar.result)[0];
                long nitzReceiveTime = ((Long)((Object[])ar.result)[1]).longValue();

                setTimeFromNITZString(nitzString, nitzReceiveTime);
                break;

            case EVENT_SIGNAL_STRENGTH_UPDATE:
                // This is a notification from
                // CommandsInterface.setOnSignalStrengthUpdate

                ar = (AsyncResult) msg.obj;

                // The radio is telling us about signal strength changes
                // we don't have to ask it
                dontPollSignalStrength = true;

                onSignalStrengthResult(ar);
                break;

            case EVENT_SIM_RECORDS_LOADED:
                updateSpnDisplay();
                break;

            case EVENT_LOCATION_UPDATES_ENABLED:
                ar = (AsyncResult) msg.obj;

                if (ar.exception == null) {
                    cm.getRegistrationState(obtainMessage(EVENT_GET_LOC_DONE, null));
                }
                break;

            case EVENT_SET_PREFERRED_NETWORK_TYPE:
                ar = (AsyncResult) msg.obj;
                // Don't care the result, only use for dereg network (COPS=2)
                message = obtainMessage(EVENT_RESET_PREFERRED_NETWORK_TYPE, ar.userObj);
                cm.setPreferredNetworkType(mPreferredNetworkType, message);
                break;

            case EVENT_RESET_PREFERRED_NETWORK_TYPE:
                ar = (AsyncResult) msg.obj;
                if (ar.userObj != null) {
                    AsyncResult.forMessage(((Message) ar.userObj)).exception
                            = ar.exception;
                    ((Message) ar.userObj).sendToTarget();
                }
                break;

            case EVENT_GET_PREFERRED_NETWORK_TYPE:
                ar = (AsyncResult) msg.obj;

                if (ar.exception == null) {
                    mPreferredNetworkType = ((int[])ar.result)[0];
                } else {
                    mPreferredNetworkType = RILConstants.NETWORK_MODE_GLOBAL;
                }

                message = obtainMessage(EVENT_SET_PREFERRED_NETWORK_TYPE, ar.userObj);
                int toggledNetworkType = RILConstants.NETWORK_MODE_GLOBAL;

                cm.setPreferredNetworkType(toggledNetworkType, message);
                break;

            case EVENT_CHECK_REPORT_GPRS:
                if (ss != null && !isGprsConsistant(gprsState, ss.getState())) {

                    // Can't register data sevice while voice service is ok
                    // i.e. CREG is ok while CGREG is not
                    // possible a network or baseband side error
                    GsmCellLocation loc = ((GsmCellLocation)phone.getCellLocation());
                    EventLog.writeEvent(EventLogTags.DATA_NETWORK_REGISTRATION_FAIL,
                            ss.getOperatorNumeric(), loc != null ? loc.getCid() : -1);
                    mReportedGprsNoReg = true;
                }
                mStartedGprsRegCheck = false;
                break;

            case EVENT_RESTRICTED_STATE_CHANGED:
                // This is a notification from
                // CommandsInterface.setOnRestrictedStateChanged

                Log.d(LOG_TAG, "[DSAC DEB] " + "EVENT_RESTRICTED_STATE_CHANGED");

                ar = (AsyncResult) msg.obj;

                onRestrictedStateChanged(ar);
                break;

            default:
                Log.e(LOG_TAG, "Unhandled message with number: " + msg.what);
            break;
        }
    }

    protected void setPowerStateToDesired() {
        // If we want it on and it's off, turn it on
        if (mDesiredPowerState
            && cm.getRadioState() == CommandsInterface.RadioState.RADIO_OFF) {
            cm.setRadioPower(true, null);
        } else if (!mDesiredPowerState && cm.getRadioState().isOn()) {
            DataConnectionTracker dcTracker = phone.mDataConnection;
            if (! dcTracker.isDataConnectionAsDesired()) {
                EventLog.writeEvent(EventLogTags.DATA_NETWORK_STATUS_ON_RADIO_OFF,
                        dcTracker.getStateInString(), dcTracker.getAnyDataEnabled() ? 1 : 0);
            }
            // If it's on and available and we want it off gracefully
            powerOffRadioSafely();
        } // Otherwise, we're in the desired state
    }

    @Override
    protected void powerOffRadioSafely() {
        // clean data connection
        DataConnectionTracker dcTracker = phone.mDataConnection;
        Message msg = dcTracker.obtainMessage(DataConnectionTracker.EVENT_CLEAN_UP_CONNECTION);
        msg.arg1 = 1; // tearDown is true
        msg.obj = GSMPhone.REASON_RADIO_TURNED_OFF;
        dcTracker.sendMessage(msg);

        // poll data state up to 15 times, with a 100ms delay
        // totaling 1.5 sec. Normal data disable action will finish in 100ms.
        for (int i = 0; i < MAX_NUM_DATA_STATE_READS; i++) {
            if (dcTracker.getState() != DataConnectionTracker.State.CONNECTED
                    && dcTracker.getState() != DataConnectionTracker.State.DISCONNECTING) {
                Log.d(LOG_TAG, "Data shutdown complete.");
                break;
            }
            SystemClock.sleep(DATA_STATE_POLL_SLEEP_MS);
        }

        // hang up all active voice calls
        if (phone.isInCall()) {
            phone.mCT.ringingCall.hangupIfAlive();
            phone.mCT.backgroundCall.hangupIfAlive();
            phone.mCT.foregroundCall.hangupIfAlive();
        }

        cm.setRadioPower(false, null);
    }

    protected void updateSpnDisplay() {
        int rule = phone.mSIMRecords.getDisplayRule(ss.getOperatorNumeric());
        String spn = phone.mSIMRecords.getServiceProviderName();
        String plmn = ss.getOperatorAlphaLong();

        // For emergency calls only, pass the EmergencyCallsOnly string via EXTRA_PLMN
        if (mEmergencyOnly && cm.getRadioState().isOn()) {
            plmn = Resources.getSystem().
                getText(com.android.internal.R.string.emergency_calls_only).toString();
        }

        if (rule != curSpnRule
                || !TextUtils.equals(spn, curSpn)
                || !TextUtils.equals(plmn, curPlmn)) {
            boolean showSpn = mEmergencyOnly
                || (rule & SIMRecords.SPN_RULE_SHOW_SPN) == SIMRecords.SPN_RULE_SHOW_SPN;
            boolean showPlmn =
                (rule & SIMRecords.SPN_RULE_SHOW_PLMN) == SIMRecords.SPN_RULE_SHOW_PLMN;

            Intent intent = new Intent(Intents.SPN_STRINGS_UPDATED_ACTION);
            intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
            intent.putExtra(Intents.EXTRA_SHOW_SPN, showSpn);
            intent.putExtra(Intents.EXTRA_SPN, spn);
            intent.putExtra(Intents.EXTRA_SHOW_PLMN, showPlmn);
            intent.putExtra(Intents.EXTRA_PLMN, plmn);
            phone.getContext().sendStickyBroadcast(intent);
        }

        curSpnRule = rule;
        curSpn = spn;
        curPlmn = plmn;
    }

    /**
     * Handle the result of one of the pollState()-related requests
     */
    protected void handlePollStateResult (int what, AsyncResult ar) {
        int ints[];
        String states[];

        // Ignore stale requests from last poll
        if (ar.userObj != pollingContext) return;

        if (ar.exception != null) {
            CommandException.Error err=null;

            if (ar.exception instanceof CommandException) {
                err = ((CommandException)(ar.exception)).getCommandError();
            }

            if (err == CommandException.Error.RADIO_NOT_AVAILABLE) {
                // Radio has crashed or turned off
                cancelPollState();
                return;
            }

            if (!cm.getRadioState().isOn()) {
                // Radio has crashed or turned off
                cancelPollState();
                return;
            }

            if (err != CommandException.Error.OP_NOT_ALLOWED_BEFORE_REG_NW &&
                    err != CommandException.Error.OP_NOT_ALLOWED_BEFORE_REG_NW) {
                Log.e(LOG_TAG,
                        "RIL implementation has returned an error where it must succeed" +
                        ar.exception);
            }
        } else try {
            switch (what) {
                case EVENT_POLL_STATE_REGISTRATION:
                    states = (String[])ar.result;
                    int lac = -1;
                    int cid = -1;
                    int regState = -1;
                    if (states.length > 0) {
                        try {
                            regState = Integer.parseInt(states[0]);
                            if (states.length >= 3) {
                                if (states[1] != null && states[1].length() > 0) {
                                    lac = Integer.parseInt(states[1], 16);
                                }
                                if (states[2] != null && states[2].length() > 0) {
                                    cid = Integer.parseInt(states[2], 16);
                                }
                            }
                        } catch (NumberFormatException ex) {
                            Log.w(LOG_TAG, "error parsing RegistrationState: " + ex);
                        }
                    }

                    mGsmRoaming = regCodeIsRoaming(regState);
                    newSS.setState (regCodeToServiceState(regState));

                    if (regState == 10 || regState == 12 || regState == 13 || regState == 14) {
                        mNewEmergencyOnly = true;
                    } else {
                        mNewEmergencyOnly = false;
                    }

                    // LAC and CID are -1 if not avail
                    newCellLoc.setLacAndCid(lac, cid);
                break;

                case EVENT_POLL_STATE_GPRS:
                    states = (String[])ar.result;

                    int type = 0;
                    regState = -1;
                    if (states.length > 0) {
                        try {
                            regState = Integer.parseInt(states[0]);

                            // states[3] (if present) is the current radio technology
                            if (states.length >= 4 && states[3] != null) {
                                type = Integer.parseInt(states[3]);
                            }
                        } catch (NumberFormatException ex) {
                            Log.w(LOG_TAG, "error parsing GprsRegistrationState: " + ex);
                        }
                    }
                    newGPRSState = regCodeToServiceState(regState);
                    mDataRoaming = regCodeIsRoaming(regState);
                    newNetworkType = type;
                    newSS.setRadioTechnology(type);
                break;

                case EVENT_POLL_STATE_OPERATOR:
                    String opNames[] = (String[])ar.result;

                    if (opNames != null && opNames.length >= 3) {
                        newSS.setOperatorName (
                                opNames[0], opNames[1], opNames[2]);
                    }
                break;

                case EVENT_POLL_STATE_NETWORK_SELECTION_MODE:
                    ints = (int[])ar.result;
                    newSS.setIsManualSelection(ints[0] == 1);
                break;
            }

        } catch (RuntimeException ex) {
            Log.e(LOG_TAG, "Exception while polling service state. "
                            + "Probably malformed RIL response.", ex);
        }

        pollingContext[0]--;

        if (pollingContext[0] == 0) {
            /**
             *  Since the roaming states of gsm service (from +CREG) and
             *  data service (from +CGREG) could be different, the new SS
             *  is set roaming while either one is roaming.
             *
             *  There is an exception for the above rule. The new SS is not set
             *  as roaming while gsm service reports roaming but indeed it is
             *  not roaming between operators.
             */
            boolean roaming = (mGsmRoaming || mDataRoaming);
            if (mGsmRoaming && !isRoamingBetweenOperators(mGsmRoaming, newSS)) {
                roaming = false;
            }
            newSS.setRoaming(roaming);
            pollStateDone();
        }
    }

    private void setSignalStrengthDefaultValues() {
        mSignalStrength = new SignalStrength(99, -1, -1, -1, -1, -1, -1, true);
    }

    /**
     * A complete "service state" from our perspective is
     * composed of a handful of separate requests to the radio.
     *
     * We make all of these requests at once, but then abandon them
     * and start over again if the radio notifies us that some
     * event has changed
     */
    private void pollState() {
        pollingContext = new int[1];
        pollingContext[0] = 0;

        switch (cm.getRadioState()) {
            case RADIO_UNAVAILABLE:
                newSS.setStateOutOfService();
                newCellLoc.setStateInvalid();
                setSignalStrengthDefaultValues();
                mGotCountryCode = false;
                pollStateDone();
            break;

            case RADIO_OFF:
                newSS.setStateOff();
                newCellLoc.setStateInvalid();
                setSignalStrengthDefaultValues();
                mGotCountryCode = false;
                pollStateDone();
            break;

            case RUIM_NOT_READY:
            case RUIM_READY:
            case RUIM_LOCKED_OR_ABSENT:
            case NV_NOT_READY:
            case NV_READY:
                Log.d(LOG_TAG, "Radio Technology Change ongoing, setting SS to off");
                newSS.setStateOff();
                newCellLoc.setStateInvalid();
                setSignalStrengthDefaultValues();
                mGotCountryCode = false;

                //NOTE: pollStateDone() is not needed in this case
                break;

            default:
                // Issue all poll-related commands at once
                // then count down the responses, which
                // are allowed to arrive out-of-order

                pollingContext[0]++;
                cm.getOperator(
                    obtainMessage(
                        EVENT_POLL_STATE_OPERATOR, pollingContext));

                pollingContext[0]++;
                cm.getGPRSRegistrationState(
                    obtainMessage(
                        EVENT_POLL_STATE_GPRS, pollingContext));

                pollingContext[0]++;
                cm.getRegistrationState(
                    obtainMessage(
                        EVENT_POLL_STATE_REGISTRATION, pollingContext));

                pollingContext[0]++;
                cm.getNetworkSelectionMode(
                    obtainMessage(
                        EVENT_POLL_STATE_NETWORK_SELECTION_MODE, pollingContext));
            break;
        }
    }

    private static String networkTypeToString(int type) {
        //Network Type from GPRS_REGISTRATION_STATE
        String ret = "unknown";

        switch (type) {
            case DATA_ACCESS_GPRS:
                ret = "GPRS";
                break;
            case DATA_ACCESS_EDGE:
                ret = "EDGE";
                break;
            case DATA_ACCESS_UMTS:
                ret = "UMTS";
                break;
            case DATA_ACCESS_HSDPA:
                ret = "HSDPA";
                break;
            case DATA_ACCESS_HSUPA:
                ret = "HSUPA";
                break;
            case DATA_ACCESS_HSPA:
                ret = "HSPA";
                break;
            default:
                Log.e(LOG_TAG, "Wrong network type: " + Integer.toString(type));
                break;
        }

        return ret;
    }

    private void pollStateDone() {
        if (DBG) {
            Log.d(LOG_TAG, "Poll ServiceState done: " +
                " oldSS=[" + ss + "] newSS=[" + newSS +
                "] oldGprs=" + gprsState + " newGprs=" + newGPRSState +
                " oldType=" + networkTypeToString(networkType) +
                " newType=" + networkTypeToString(newNetworkType));
        }

        boolean hasRegistered =
            ss.getState() != ServiceState.STATE_IN_SERVICE
            && newSS.getState() == ServiceState.STATE_IN_SERVICE;

        boolean hasDeregistered =
            ss.getState() == ServiceState.STATE_IN_SERVICE
            && newSS.getState() != ServiceState.STATE_IN_SERVICE;

        boolean hasGprsAttached =
                gprsState != ServiceState.STATE_IN_SERVICE
                && newGPRSState == ServiceState.STATE_IN_SERVICE;

        boolean hasGprsDetached =
                gprsState == ServiceState.STATE_IN_SERVICE
                && newGPRSState != ServiceState.STATE_IN_SERVICE;

        boolean hasNetworkTypeChanged = networkType != newNetworkType;

        boolean hasChanged = !newSS.equals(ss);

        boolean hasRoamingOn = !ss.getRoaming() && newSS.getRoaming();

        boolean hasRoamingOff = ss.getRoaming() && !newSS.getRoaming();

        boolean hasLocationChanged = !newCellLoc.equals(cellLoc);

        boolean hasEmergencyOnlyChanged = mNewEmergencyOnly != mEmergencyOnly;

        // Add an event log when connection state changes
        if (ss.getState() != newSS.getState() || gprsState != newGPRSState) {
            EventLog.writeEvent(EventLogTags.GSM_SERVICE_STATE_CHANGE,
                ss.getState(), gprsState, newSS.getState(), newGPRSState);
        }

        ServiceState tss;
        tss = ss;
        ss = newSS;
        newSS = tss;
        // clean slate for next time
        newSS.setStateOutOfService();

        GsmCellLocation tcl = cellLoc;
        cellLoc = newCellLoc;
        newCellLoc = tcl;

        mEmergencyOnly = mNewEmergencyOnly;

        // Add an event log when network type switched
        // TODO: we may add filtering to reduce the event logged,
        // i.e. check preferred network setting, only switch to 2G, etc
        if (hasNetworkTypeChanged) {
            int cid = -1;
            GsmCellLocation loc = ((GsmCellLocation)phone.getCellLocation());
            if (loc != null) cid = loc.getCid();
            EventLog.writeEvent(EventLogTags.GSM_RAT_SWITCHED, cid, networkType, newNetworkType);
            Log.d(LOG_TAG,
                    "RAT switched " + networkTypeToString(networkType) + " -> "
                    + networkTypeToString(newNetworkType) + " at cell " + cid);
        }

        gprsState = newGPRSState;
        networkType = newNetworkType;

        newSS.setStateOutOfService(); // clean slate for next time

        if (hasNetworkTypeChanged) {
            phone.setSystemProperty(TelephonyProperties.PROPERTY_DATA_NETWORK_TYPE,
                    networkTypeToString(networkType));
        }

        if (hasRegistered) {
            networkAttachedRegistrants.notifyRegistrants();
        }

        if (hasChanged) {
            String operatorNumeric;

            phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_ALPHA,
                ss.getOperatorAlphaLong());

            operatorNumeric = ss.getOperatorNumeric();
            phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_NUMERIC, operatorNumeric);

            if (operatorNumeric == null) {
                phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_ISO_COUNTRY, "");
            } else {
                String iso = "";
                try{
                    iso = MccTable.countryCodeForMcc(Integer.parseInt(
                            operatorNumeric.substring(0,3)));
                } catch ( NumberFormatException ex){
                    Log.w(LOG_TAG, "countryCodeForMcc error" + ex);
                } catch ( StringIndexOutOfBoundsException ex) {
                    Log.w(LOG_TAG, "countryCodeForMcc error" + ex);
                }

                phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_ISO_COUNTRY, iso);
                mGotCountryCode = true;

                if (mNeedFixZone) {
                    TimeZone zone = null;
                    // If the offset is (0, false) and the timezone property
                    // is set, use the timezone property rather than
                    // GMT.
                    String zoneName = SystemProperties.get(TIMEZONE_PROPERTY);
                    if ((mZoneOffset == 0) && (mZoneDst == false) &&
                        (zoneName != null) && (zoneName.length() > 0) &&
                        (Arrays.binarySearch(GMT_COUNTRY_CODES, iso) < 0)) {
                        zone = TimeZone.getDefault();
                        // For NITZ string without timezone,
                        // need adjust time to reflect default timezone setting
                        long tzOffset;
                        tzOffset = zone.getOffset(System.currentTimeMillis());
                        if (getAutoTime()) {
                            setAndBroadcastNetworkSetTime(System.currentTimeMillis() - tzOffset);
                        } else {
                            // Adjust the saved NITZ time to account for tzOffset.
                            mSavedTime = mSavedTime - tzOffset;
                        }
                    } else if (iso.equals("")){
                        // Country code not found.  This is likely a test network.
                        // Get a TimeZone based only on the NITZ parameters (best guess).
                        zone = getNitzTimeZone(mZoneOffset, mZoneDst, mZoneTime);
                    } else {
                        zone = TimeUtils.getTimeZone(mZoneOffset,
                            mZoneDst, mZoneTime, iso);
                    }

                    mNeedFixZone = false;

                    if (zone != null) {
                        if (getAutoTime()) {
                            setAndBroadcastNetworkSetTimeZone(zone.getID());
                        }
                        saveNitzTimeZone(zone.getID());
                    }
                }
            }

            phone.setSystemProperty(TelephonyProperties.PROPERTY_OPERATOR_ISROAMING,
                ss.getRoaming() ? "true" : "false");

            phone.notifyServiceStateChanged(ss);
        }

        if (hasChanged || hasEmergencyOnlyChanged) {
            updateSpnDisplay();
        }

        if (hasGprsAttached) {
            gprsAttachedRegistrants.notifyRegistrants();
        }

        if (hasGprsDetached) {
            gprsDetachedRegistrants.notifyRegistrants();
        }

        if (hasNetworkTypeChanged) {
            phone.notifyDataConnection(null);
        }

        if (hasRoamingOn) {
            roamingOnRegistrants.notifyRegistrants();
        }

        if (hasRoamingOff) {
            roamingOffRegistrants.notifyRegistrants();
        }

        if (hasLocationChanged) {
            phone.notifyLocationChanged();
        }

        if (! isGprsConsistant(gprsState, ss.getState())) {
            if (!mStartedGprsRegCheck && !mReportedGprsNoReg) {
                mStartedGprsRegCheck = true;

                int check_period = Settings.Secure.getInt(
                        phone.getContext().getContentResolver(),
                        Settings.Secure.GPRS_REGISTER_CHECK_PERIOD_MS,
                        DEFAULT_GPRS_CHECK_PERIOD_MILLIS);
                sendMessageDelayed(obtainMessage(EVENT_CHECK_REPORT_GPRS),
                        check_period);
            }
        } else {
            mReportedGprsNoReg = false;
        }
    }

    /**
     * Check if GPRS got registred while voice is registered
     *
     * @param gprsState for GPRS registration state, i.e. CGREG in GSM
     * @param serviceState for voice registration state, i.e. CREG in GSM
     * @return false if device only register to voice but not gprs
     */
    private boolean isGprsConsistant (int gprsState, int serviceState) {
        return !((serviceState == ServiceState.STATE_IN_SERVICE) &&
                (gprsState != ServiceState.STATE_IN_SERVICE));
    }

    /**
     * Returns a TimeZone object based only on parameters from the NITZ string.
     */
    private TimeZone getNitzTimeZone(int offset, boolean dst, long when) {
        TimeZone guess = findTimeZone(offset, dst, when);
        if (guess == null) {
            // Couldn't find a proper timezone.  Perhaps the DST data is wrong.
            guess = findTimeZone(offset, !dst, when);
        }
        if (DBG) {
            Log.d(LOG_TAG, "getNitzTimeZone returning "
                    + (guess == null ? guess : guess.getID()));
        }
        return guess;
    }

    private TimeZone findTimeZone(int offset, boolean dst, long when) {
        int rawOffset = offset;
        if (dst) {
            rawOffset -= 3600000;
        }
        String[] zones = TimeZone.getAvailableIDs(rawOffset);
        TimeZone guess = null;
        Date d = new Date(when);
        for (String zone : zones) {
            TimeZone tz = TimeZone.getTimeZone(zone);
            if (tz.getOffset(when) == offset &&
                tz.inDaylightTime(d) == dst) {
                guess = tz;
                break;
            }
        }

        return guess;
    }

    private void queueNextSignalStrengthPoll() {
        if (dontPollSignalStrength || (cm.getRadioState().isCdma())) {
            // The radio is telling us about signal strength changes
            // we don't have to ask it
            return;
        }

        Message msg;

        msg = obtainMessage();
        msg.what = EVENT_POLL_SIGNAL_STRENGTH;

        long nextTime;

        // TODO Done't poll signal strength if screen is off
        sendMessageDelayed(msg, POLL_PERIOD_MILLIS);
    }

    /**
     *  send signal-strength-changed notification if changed
     *  Called both for solicited and unsolicited signal stength updates
     */
    private void onSignalStrengthResult(AsyncResult ar) {
        SignalStrength oldSignalStrength = mSignalStrength;
        int rssi = 99;

        if (ar.exception != null) {
            // -1 = unknown
            // most likely radio is resetting/disconnected
            setSignalStrengthDefaultValues();
        } else {
            int[] ints = (int[])ar.result;

            // bug 658816 seems to be a case where the result is 0-length
            if (ints.length != 0) {
                rssi = ints[0];
            } else {
                Log.e(LOG_TAG, "Bogus signal strength response");
                rssi = 99;
            }
        }

        mSignalStrength = new SignalStrength(rssi, -1, -1, -1,
                -1, -1, -1, true);

        if (!mSignalStrength.equals(oldSignalStrength)) {
            try { // This takes care of delayed EVENT_POLL_SIGNAL_STRENGTH (scheduled after
                  // POLL_PERIOD_MILLIS) during Radio Technology Change)
                phone.notifySignalStrength();
           } catch (NullPointerException ex) {
                log("onSignalStrengthResult() Phone already destroyed: " + ex
                        + "SignalStrength not notified");
           }
        }
    }

    /**
     * Set restricted state based on the OnRestrictedStateChanged notification
     * If any voice or packet restricted state changes, trigger a UI
     * notification and notify registrants when sim is ready.
     *
     * @param ar an int value of RIL_RESTRICTED_STATE_*
     */
    private void onRestrictedStateChanged(AsyncResult ar) {
        Log.d(LOG_TAG, "[DSAC DEB] " + "onRestrictedStateChanged");
        RestrictedState newRs = new RestrictedState();

        Log.d(LOG_TAG, "[DSAC DEB] " + "current rs at enter "+ rs);

        if (ar.exception == null) {
            int[] ints = (int[])ar.result;
            int state = ints[0];

            newRs.setCsEmergencyRestricted(
                    ((state & RILConstants.RIL_RESTRICTED_STATE_CS_EMERGENCY) != 0) ||
                    ((state & RILConstants.RIL_RESTRICTED_STATE_CS_ALL) != 0) );
            //ignore the normal call and data restricted state before SIM READY
            if (phone.getIccCard().getState() == IccCard.State.READY) {
                newRs.setCsNormalRestricted(
                        ((state & RILConstants.RIL_RESTRICTED_STATE_CS_NORMAL) != 0) ||
                        ((state & RILConstants.RIL_RESTRICTED_STATE_CS_ALL) != 0) );
                newRs.setPsRestricted(
                        (state & RILConstants.RIL_RESTRICTED_STATE_PS_ALL)!= 0);
            }

            Log.d(LOG_TAG, "[DSAC DEB] " + "new rs "+ newRs);

            if (!rs.isPsRestricted() && newRs.isPsRestricted()) {
                psRestrictEnabledRegistrants.notifyRegistrants();
                setNotification(PS_ENABLED);
            } else if (rs.isPsRestricted() && !newRs.isPsRestricted()) {
                psRestrictDisabledRegistrants.notifyRegistrants();
                setNotification(PS_DISABLED);
            }

            /**
             * There are two kind of cs restriction, normal and emergency. So
             * there are 4 x 4 combinations in current and new restricted states
             * and we only need to notify when state is changed.
             */
            if (rs.isCsRestricted()) {
                if (!newRs.isCsRestricted()) {
                    // remove all restriction
                    setNotification(CS_DISABLED);
                } else if (!newRs.isCsNormalRestricted()) {
                    // remove normal restriction
                    setNotification(CS_EMERGENCY_ENABLED);
                } else if (!newRs.isCsEmergencyRestricted()) {
                    // remove emergency restriction
                    setNotification(CS_NORMAL_ENABLED);
                }
            } else if (rs.isCsEmergencyRestricted() && !rs.isCsNormalRestricted()) {
                if (!newRs.isCsRestricted()) {
                    // remove all restriction
                    setNotification(CS_DISABLED);
                } else if (newRs.isCsRestricted()) {
                    // enable all restriction
                    setNotification(CS_ENABLED);
                } else if (newRs.isCsNormalRestricted()) {
                    // remove emergency restriction and enable normal restriction
                    setNotification(CS_NORMAL_ENABLED);
                }
            } else if (!rs.isCsEmergencyRestricted() && rs.isCsNormalRestricted()) {
                if (!newRs.isCsRestricted()) {
                    // remove all restriction
                    setNotification(CS_DISABLED);
                } else if (newRs.isCsRestricted()) {
                    // enable all restriction
                    setNotification(CS_ENABLED);
                } else if (newRs.isCsEmergencyRestricted()) {
                    // remove normal restriction and enable emergency restriction
                    setNotification(CS_EMERGENCY_ENABLED);
                }
            } else {
                if (newRs.isCsRestricted()) {
                    // enable all restriction
                    setNotification(CS_ENABLED);
                } else if (newRs.isCsEmergencyRestricted()) {
                    // enable emergency restriction
                    setNotification(CS_EMERGENCY_ENABLED);
                } else if (newRs.isCsNormalRestricted()) {
                    // enable normal restriction
                    setNotification(CS_NORMAL_ENABLED);
                }
            }

            rs = newRs;
        }
        Log.d(LOG_TAG, "[DSAC DEB] " + "current rs at return "+ rs);
    }

    /** code is registration state 0-5 from TS 27.007 7.2 */
    private int regCodeToServiceState(int code) {
        switch (code) {
            case 0:
            case 2: // 2 is "searching"
            case 3: // 3 is "registration denied"
            case 4: // 4 is "unknown" no vaild in current baseband
            case 10:// same as 0, but indicates that emergency call is possible.
            case 12:// same as 2, but indicates that emergency call is possible.
            case 13:// same as 3, but indicates that emergency call is possible.
            case 14:// same as 4, but indicates that emergency call is possible.
                return ServiceState.STATE_OUT_OF_SERVICE;

            case 1:
                return ServiceState.STATE_IN_SERVICE;

            case 5:
                // in service, roam
                return ServiceState.STATE_IN_SERVICE;

            default:
                Log.w(LOG_TAG, "unexpected service state " + code);
                return ServiceState.STATE_OUT_OF_SERVICE;
        }
    }


    /**
     * code is registration state 0-5 from TS 27.007 7.2
     * returns true if registered roam, false otherwise
     */
    private boolean regCodeIsRoaming (int code) {
        // 5 is  "in service -- roam"
        return 5 == code;
    }

    /**
     * Set roaming state when gsmRoaming is true and, if operator mcc is the
     * same as sim mcc, ons is different from spn
     * @param gsmRoaming TS 27.007 7.2 CREG registered roaming
     * @param s ServiceState hold current ons
     * @return true for roaming state set
     */
    private boolean isRoamingBetweenOperators(boolean gsmRoaming, ServiceState s) {
        String spn = SystemProperties.get(TelephonyProperties.PROPERTY_ICC_OPERATOR_ALPHA, "empty");

        String onsl = s.getOperatorAlphaLong();
        String onss = s.getOperatorAlphaShort();

        boolean equalsOnsl = onsl != null && spn.equals(onsl);
        boolean equalsOnss = onss != null && spn.equals(onss);

        String simNumeric = SystemProperties.get(
                TelephonyProperties.PROPERTY_ICC_OPERATOR_NUMERIC, "");
        String  operatorNumeric = s.getOperatorNumeric();

        boolean equalsMcc = true;
        try {
            equalsMcc = simNumeric.substring(0, 3).
                    equals(operatorNumeric.substring(0, 3));
        } catch (Exception e){
        }

        return gsmRoaming && !(equalsMcc && (equalsOnsl || equalsOnss));
    }

    private static int twoDigitsAt(String s, int offset) {
        int a, b;

        a = Character.digit(s.charAt(offset), 10);
        b = Character.digit(s.charAt(offset+1), 10);

        if (a < 0 || b < 0) {

            throw new RuntimeException("invalid format");
        }

        return a*10 + b;
    }

    /**
     * @return The current GPRS state. IN_SERVICE is the same as "attached"
     * and OUT_OF_SERVICE is the same as detached.
     */
    int getCurrentGprsState() {
        return gprsState;
    }

    /**
     * @return true if phone is camping on a technology (eg UMTS)
     * that could support voice and data simultaniously.
     */
    boolean isConcurrentVoiceAndData() {
        return (networkType >= DATA_ACCESS_UMTS);
    }

    /**
     * Provides the name of the algorithmic time zone for the specified
     * offset.  Taken from TimeZone.java.
     */
    private static String displayNameFor(int off) {
        off = off / 1000 / 60;

        char[] buf = new char[9];
        buf[0] = 'G';
        buf[1] = 'M';
        buf[2] = 'T';

        if (off < 0) {
            buf[3] = '-';
            off = -off;
        } else {
            buf[3] = '+';
        }

        int hours = off / 60;
        int minutes = off % 60;

        buf[4] = (char) ('0' + hours / 10);
        buf[5] = (char) ('0' + hours % 10);

        buf[6] = ':';

        buf[7] = (char) ('0' + minutes / 10);
        buf[8] = (char) ('0' + minutes % 10);

        return new String(buf);
    }

    /**
     * nitzReceiveTime is time_t that the NITZ time was posted
     */
    private void setTimeFromNITZString (String nitz, long nitzReceiveTime) {
        // "yy/mm/dd,hh:mm:ss(+/-)tz"
        // tz is in number of quarter-hours

        long start = SystemClock.elapsedRealtime();
        Log.i(LOG_TAG, "NITZ: " + nitz + "," + nitzReceiveTime +
                        " start=" + start + " delay=" + (start - nitzReceiveTime));

        try {
            /* NITZ time (hour:min:sec) will be in UTC but it supplies the timezone
             * offset as well (which we won't worry about until later) */
            Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT"));

            c.clear();
            c.set(Calendar.DST_OFFSET, 0);

            String[] nitzSubs = nitz.split("[/:,+-]");

            int year = 2000 + Integer.parseInt(nitzSubs[0]);
            c.set(Calendar.YEAR, year);

            // month is 0 based!
            int month = Integer.parseInt(nitzSubs[1]) - 1;
            c.set(Calendar.MONTH, month);

            int date = Integer.parseInt(nitzSubs[2]);
            c.set(Calendar.DATE, date);

            int hour = Integer.parseInt(nitzSubs[3]);
            c.set(Calendar.HOUR, hour);

            int minute = Integer.parseInt(nitzSubs[4]);
            c.set(Calendar.MINUTE, minute);

            int second = Integer.parseInt(nitzSubs[5]);
            c.set(Calendar.SECOND, second);

            boolean sign = (nitz.indexOf('-') == -1);

            int tzOffset = Integer.parseInt(nitzSubs[6]);

            int dst = (nitzSubs.length >= 8 ) ? Integer.parseInt(nitzSubs[7])
                                              : 0;

            // The zone offset received from NITZ is for current local time,
            // so DST correction is already applied.  Don't add it again.
            //
            // tzOffset += dst * 4;
            //
            // We could unapply it if we wanted the raw offset.

            tzOffset = (sign ? 1 : -1) * tzOffset * 15 * 60 * 1000;

            TimeZone    zone = null;

            // As a special extension, the Android emulator appends the name of
            // the host computer's timezone to the nitz string. this is zoneinfo
            // timezone name of the form Area!Location or Area!Location!SubLocation
            // so we need to convert the ! into /
            if (nitzSubs.length >= 9) {
                String  tzname = nitzSubs[8].replace('!','/');
                zone = TimeZone.getTimeZone( tzname );
            }

            String iso = SystemProperties.get(TelephonyProperties.PROPERTY_OPERATOR_ISO_COUNTRY);

            if (zone == null) {

                if (mGotCountryCode) {
                    if (iso != null && iso.length() > 0) {
                        zone = TimeUtils.getTimeZone(tzOffset, dst != 0,
                                c.getTimeInMillis(),
                                iso);
                    } else {
                        // We don't have a valid iso country code.  This is
                        // most likely because we're on a test network that's
                        // using a bogus MCC (eg, "001"), so get a TimeZone
                        // based only on the NITZ parameters.
                        zone = getNitzTimeZone(tzOffset, (dst != 0), c.getTimeInMillis());
                    }
                }
            }

            if (zone == null) {
                // We got the time before the country, so we don't know
                // how to identify the DST rules yet.  Save the information
                // and hope to fix it up later.

                mNeedFixZone = true;
                mZoneOffset  = tzOffset;
                mZoneDst     = dst != 0;
                mZoneTime    = c.getTimeInMillis();
            }

            if (zone != null) {
                if (getAutoTime()) {
                    setAndBroadcastNetworkSetTimeZone(zone.getID());
                }
                saveNitzTimeZone(zone.getID());
            }

            String ignore = SystemProperties.get("gsm.ignore-nitz");
            if (ignore != null && ignore.equals("yes")) {
                Log.i(LOG_TAG, "NITZ: Not setting clock because gsm.ignore-nitz is set");
                return;
            }

            try {
                mWakeLock.acquire();

                if (getAutoTime()) {
                    long millisSinceNitzReceived
                            = SystemClock.elapsedRealtime() - nitzReceiveTime;

                    if (millisSinceNitzReceived < 0) {
                        // Sanity check: something is wrong
                        Log.i(LOG_TAG, "NITZ: not setting time, clock has rolled "
                                            + "backwards since NITZ time was received, "
                                            + nitz);
                        return;
                    }

                    if (millisSinceNitzReceived > Integer.MAX_VALUE) {
                        // If the time is this far off, something is wrong > 24 days!
                        Log.i(LOG_TAG, "NITZ: not setting time, processing has taken "
                                        + (millisSinceNitzReceived / (1000 * 60 * 60 * 24))
                                        + " days");
                        return;
                    }

                    // Note: with range checks above, cast to int is safe
                    c.add(Calendar.MILLISECOND, (int)millisSinceNitzReceived);

                    Log.i(LOG_TAG, "NITZ: Setting time of day to " + c.getTime()
                        + " NITZ receive delay(ms): " + millisSinceNitzReceived
                        + " gained(ms): "
                        + (c.getTimeInMillis() - System.currentTimeMillis())
                        + " from " + nitz);

                    setAndBroadcastNetworkSetTime(c.getTimeInMillis());
                    Log.i(LOG_TAG, "NITZ: after Setting time of day");
                }
                SystemProperties.set("gsm.nitz.time", String.valueOf(c.getTimeInMillis()));
                saveNitzTime(c.getTimeInMillis());
                if (Config.LOGV) {
                    long end = SystemClock.elapsedRealtime();
                    Log.v(LOG_TAG, "NITZ: end=" + end + " dur=" + (end - start));
                }
            } finally {
                mWakeLock.release();
            }
        } catch (RuntimeException ex) {
            Log.e(LOG_TAG, "NITZ: Parsing NITZ time " + nitz, ex);
        }
    }

    private boolean getAutoTime() {
        try {
            return Settings.System.getInt(phone.getContext().getContentResolver(),
                    Settings.System.AUTO_TIME) > 0;
        } catch (SettingNotFoundException snfe) {
            return true;
        }
    }

    private void saveNitzTimeZone(String zoneId) {
        mSavedTimeZone = zoneId;
    }

    private void saveNitzTime(long time) {
        mSavedTime = time;
        mSavedAtTime = SystemClock.elapsedRealtime();
    }

    /**
     * Set the timezone and send out a sticky broadcast so the system can
     * determine if the timezone was set by the carrier.
     *
     * @param zoneId timezone set by carrier
     */
    private void setAndBroadcastNetworkSetTimeZone(String zoneId) {
        AlarmManager alarm =
            (AlarmManager) phone.getContext().getSystemService(Context.ALARM_SERVICE);
        alarm.setTimeZone(zoneId);
        Intent intent = new Intent(TelephonyIntents.ACTION_NETWORK_SET_TIMEZONE);
        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
        intent.putExtra("time-zone", zoneId);
        phone.getContext().sendStickyBroadcast(intent);
    }

    /**
     * Set the time and Send out a sticky broadcast so the system can determine
     * if the time was set by the carrier.
     *
     * @param time time set by network
     */
    private void setAndBroadcastNetworkSetTime(long time) {
        SystemClock.setCurrentTimeMillis(time);
        Intent intent = new Intent(TelephonyIntents.ACTION_NETWORK_SET_TIME);
        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
        intent.putExtra("time", time);
        phone.getContext().sendStickyBroadcast(intent);
    }

    private void revertToNitz() {
        if (Settings.System.getInt(phone.getContext().getContentResolver(),
                Settings.System.AUTO_TIME, 0) == 0) {
            return;
        }
        Log.d(LOG_TAG, "Reverting to NITZ: tz='" + mSavedTimeZone
                + "' mSavedTime=" + mSavedTime
                + " mSavedAtTime=" + mSavedAtTime);
        if (mSavedTimeZone != null && mSavedTime != 0 && mSavedAtTime != 0) {
            setAndBroadcastNetworkSetTimeZone(mSavedTimeZone);
            setAndBroadcastNetworkSetTime(mSavedTime
                    + (SystemClock.elapsedRealtime() - mSavedAtTime));
        }
    }

    /**
     * Post a notification to NotificationManager for restricted state
     *
     * @param notifyType is one state of PS/CS_*_ENABLE/DISABLE
     */
    private void setNotification(int notifyType) {

        Log.d(LOG_TAG, "[DSAC DEB] " + "create notification " + notifyType);
        Context context = phone.getContext();

        mNotification = new Notification();
        mNotification.when = System.currentTimeMillis();
        mNotification.flags = Notification.FLAG_AUTO_CANCEL;
        mNotification.icon = com.android.internal.R.drawable.stat_sys_warning;
        Intent intent = new Intent();
        mNotification.contentIntent = PendingIntent
        .getActivity(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

        CharSequence details = "";
        CharSequence title = context.getText(com.android.internal.R.string.RestrictedChangedTitle);
        int notificationId = CS_NOTIFICATION;

        switch (notifyType) {
        case PS_ENABLED:
            notificationId = PS_NOTIFICATION;
            details = context.getText(com.android.internal.R.string.RestrictedOnData);;
            break;
        case PS_DISABLED:
            notificationId = PS_NOTIFICATION;
            break;
        case CS_ENABLED:
            details = context.getText(com.android.internal.R.string.RestrictedOnAllVoice);;
            break;
        case CS_NORMAL_ENABLED:
            details = context.getText(com.android.internal.R.string.RestrictedOnNormal);;
            break;
        case CS_EMERGENCY_ENABLED:
            details = context.getText(com.android.internal.R.string.RestrictedOnEmergency);;
            break;
        case CS_DISABLED:
            // do nothing and cancel the notification later
            break;
        }

        Log.d(LOG_TAG, "[DSAC DEB] " + "put notification " + title + " / " +details);
        mNotification.tickerText = title;
        mNotification.setLatestEventInfo(context, title, details,
                mNotification.contentIntent);

        NotificationManager notificationManager = (NotificationManager)
            context.getSystemService(Context.NOTIFICATION_SERVICE);

        if (notifyType == PS_DISABLED || notifyType == CS_DISABLED) {
            // cancel previous post notification
            notificationManager.cancel(notificationId);
        } else {
            // update restricted state notification
            notificationManager.notify(notificationId, mNotification);
        }
    }

    private void log(String s) {
        Log.d(LOG_TAG, "[GsmServiceStateTracker] " + s);
    }
}