/*
 * Copyright (C) 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.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.net.LinkCapabilities;
import android.net.LinkProperties;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.os.UserHandle;
import android.telephony.CellLocation;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.CellInfo;
import android.telephony.TelephonyManager;
import android.telephony.DisconnectCause;
import android.telephony.PreciseCallState;
import android.telephony.PreciseDataConnectionState;
import android.telephony.PreciseDisconnectCause;
import android.text.TextUtils;
import android.util.Slog;

import java.util.ArrayList;
import java.util.List;
import java.io.FileDescriptor;
import java.io.PrintWriter;

import com.android.internal.app.IBatteryStats;
import com.android.internal.telephony.ITelephonyRegistry;
import com.android.internal.telephony.IPhoneStateListener;
import com.android.internal.telephony.DefaultPhoneNotifier;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.ServiceStateTracker;
import com.android.internal.telephony.TelephonyIntents;
import com.android.server.am.BatteryStatsService;

/**
 * Since phone process can be restarted, this class provides a centralized place
 * that applications can register and be called back from.
 */
class TelephonyRegistry extends ITelephonyRegistry.Stub {
    private static final String TAG = "TelephonyRegistry";
    private static final boolean DBG = false;
    private static final boolean DBG_LOC = false;

    private static class Record {
        String pkgForDebug;

        IBinder binder;

        IPhoneStateListener callback;

        int callerUid;

        int events;

        @Override
        public String toString() {
            return "{pkgForDebug=" + pkgForDebug + " callerUid=" + callerUid +
                    " events=" + Integer.toHexString(events) + "}";
        }
    }

    private final Context mContext;

    // access should be inside synchronized (mRecords) for these two fields
    private final ArrayList<IBinder> mRemoveList = new ArrayList<IBinder>();
    private final ArrayList<Record> mRecords = new ArrayList<Record>();

    private final IBatteryStats mBatteryStats;

    private int mCallState = TelephonyManager.CALL_STATE_IDLE;

    private String mCallIncomingNumber = "";

    private ServiceState mServiceState = new ServiceState();

    private SignalStrength mSignalStrength = new SignalStrength();

    private boolean mMessageWaiting = false;

    private boolean mCallForwarding = false;

    private int mDataActivity = TelephonyManager.DATA_ACTIVITY_NONE;

    private int mDataConnectionState = TelephonyManager.DATA_UNKNOWN;

    private boolean mDataConnectionPossible = false;

    private String mDataConnectionReason = "";

    private String mDataConnectionApn = "";

    private ArrayList<String> mConnectedApns;

    private LinkProperties mDataConnectionLinkProperties;

    private LinkCapabilities mDataConnectionLinkCapabilities;

    private Bundle mCellLocation = new Bundle();

    private int mDataConnectionNetworkType;

    private int mOtaspMode = ServiceStateTracker.OTASP_UNKNOWN;

    private List<CellInfo> mCellInfo = null;

    private int mRingingCallState = PreciseCallState.PRECISE_CALL_STATE_IDLE;

    private int mForegroundCallState = PreciseCallState.PRECISE_CALL_STATE_IDLE;

    private int mBackgroundCallState = PreciseCallState.PRECISE_CALL_STATE_IDLE;

    private PreciseCallState mPreciseCallState = new PreciseCallState();

    private PreciseDataConnectionState mPreciseDataConnectionState =
                new PreciseDataConnectionState();

    static final int PHONE_STATE_PERMISSION_MASK =
                PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR |
                PhoneStateListener.LISTEN_CALL_STATE |
                PhoneStateListener.LISTEN_DATA_ACTIVITY |
                PhoneStateListener.LISTEN_DATA_CONNECTION_STATE |
                PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR;

    static final int PRECISE_PHONE_STATE_PERMISSION_MASK =
                PhoneStateListener.LISTEN_PRECISE_CALL_STATE |
                PhoneStateListener.LISTEN_PRECISE_DATA_CONNECTION_STATE;

    private static final int MSG_USER_SWITCHED = 1;

    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_USER_SWITCHED: {
                    if (DBG) Slog.d(TAG, "MSG_USER_SWITCHED userId=" + msg.arg1);
                    TelephonyRegistry.this.notifyCellLocation(mCellLocation);
                    break;
                }
            }
        }
    };

    private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (Intent.ACTION_USER_SWITCHED.equals(action)) {
                mHandler.sendMessage(mHandler.obtainMessage(MSG_USER_SWITCHED,
                       intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0), 0));
            }
        }
    };

    // we keep a copy of all of the state so we can send it out when folks
    // register for it
    //
    // In these calls we call with the lock held. This is safe becasuse remote
    // calls go through a oneway interface and local calls going through a
    // handler before they get to app code.

    TelephonyRegistry(Context context) {
        CellLocation  location = CellLocation.getEmpty();

        // Note that location can be null for non-phone builds like
        // like the generic one.
        if (location != null) {
            location.fillInNotifierBundle(mCellLocation);
        }
        mContext = context;
        mBatteryStats = BatteryStatsService.getService();
        mConnectedApns = new ArrayList<String>();
    }

    public void systemRunning() {
        // Watch for interesting updates
        final IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_USER_SWITCHED);
        filter.addAction(Intent.ACTION_USER_REMOVED);
        mContext.registerReceiver(mBroadcastReceiver, filter);
    }

    @Override
    public void listen(String pkgForDebug, IPhoneStateListener callback, int events,
            boolean notifyNow) {
        int callerUid = UserHandle.getCallingUserId();
        int myUid = UserHandle.myUserId();
        if (DBG) {
            Slog.d(TAG, "listen: E pkg=" + pkgForDebug + " events=0x" + Integer.toHexString(events)
                + " myUid=" + myUid
                + " callerUid=" + callerUid);
        }
        if (events != 0) {
            /* Checks permission and throws Security exception */
            checkListenerPermission(events);

            synchronized (mRecords) {
                // register
                Record r = null;
                find_and_add: {
                    IBinder b = callback.asBinder();
                    final int N = mRecords.size();
                    for (int i = 0; i < N; i++) {
                        r = mRecords.get(i);
                        if (b == r.binder) {
                            break find_and_add;
                        }
                    }
                    r = new Record();
                    r.binder = b;
                    r.callback = callback;
                    r.pkgForDebug = pkgForDebug;
                    r.callerUid = callerUid;
                    mRecords.add(r);
                    if (DBG) Slog.i(TAG, "listen: add new record=" + r);
                }
                int send = events & (events ^ r.events);
                r.events = events;
                if (notifyNow) {
                    if ((events & PhoneStateListener.LISTEN_SERVICE_STATE) != 0) {
                        try {
                            r.callback.onServiceStateChanged(new ServiceState(mServiceState));
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_SIGNAL_STRENGTH) != 0) {
                        try {
                            int gsmSignalStrength = mSignalStrength.getGsmSignalStrength();
                            r.callback.onSignalStrengthChanged((gsmSignalStrength == 99 ? -1
                                    : gsmSignalStrength));
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR) != 0) {
                        try {
                            r.callback.onMessageWaitingIndicatorChanged(mMessageWaiting);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR) != 0) {
                        try {
                            r.callback.onCallForwardingIndicatorChanged(mCallForwarding);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if (validateEventsAndUserLocked(r, PhoneStateListener.LISTEN_CELL_LOCATION)) {
                        try {
                            if (DBG_LOC) Slog.d(TAG, "listen: mCellLocation=" + mCellLocation);
                            r.callback.onCellLocationChanged(new Bundle(mCellLocation));
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_CALL_STATE) != 0) {
                        try {
                            r.callback.onCallStateChanged(mCallState, mCallIncomingNumber);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_DATA_CONNECTION_STATE) != 0) {
                        try {
                            r.callback.onDataConnectionStateChanged(mDataConnectionState,
                                mDataConnectionNetworkType);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_DATA_ACTIVITY) != 0) {
                        try {
                            r.callback.onDataActivity(mDataActivity);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) != 0) {
                        try {
                            r.callback.onSignalStrengthsChanged(mSignalStrength);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_OTASP_CHANGED) != 0) {
                        try {
                            r.callback.onOtaspChanged(mOtaspMode);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if (validateEventsAndUserLocked(r, PhoneStateListener.LISTEN_CELL_INFO)) {
                        try {
                            if (DBG_LOC) Slog.d(TAG, "listen: mCellInfo=" + mCellInfo);
                            r.callback.onCellInfoChanged(mCellInfo);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_PRECISE_CALL_STATE) != 0) {
                        try {
                            r.callback.onPreciseCallStateChanged(mPreciseCallState);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                    if ((events & PhoneStateListener.LISTEN_PRECISE_DATA_CONNECTION_STATE) != 0) {
                        try {
                            r.callback.onPreciseDataConnectionStateChanged(
                                    mPreciseDataConnectionState);
                        } catch (RemoteException ex) {
                            remove(r.binder);
                        }
                    }
                }
            }
        } else {
            remove(callback.asBinder());
        }
    }

    private void remove(IBinder binder) {
        synchronized (mRecords) {
            final int recordCount = mRecords.size();
            for (int i = 0; i < recordCount; i++) {
                if (mRecords.get(i).binder == binder) {
                    mRecords.remove(i);
                    return;
                }
            }
        }
    }

    public void notifyCallState(int state, String incomingNumber) {
        if (!checkNotifyPermission("notifyCallState()")) {
            return;
        }
        synchronized (mRecords) {
            mCallState = state;
            mCallIncomingNumber = incomingNumber;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_CALL_STATE) != 0) {
                    try {
                        r.callback.onCallStateChanged(state, incomingNumber);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastCallStateChanged(state, incomingNumber);
    }

    public void notifyServiceState(ServiceState state) {
        if (!checkNotifyPermission("notifyServiceState()")){
            return;
        }
        synchronized (mRecords) {
            mServiceState = state;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_SERVICE_STATE) != 0) {
                    try {
                        r.callback.onServiceStateChanged(new ServiceState(state));
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastServiceStateChanged(state);
    }

    public void notifySignalStrength(SignalStrength signalStrength) {
        if (!checkNotifyPermission("notifySignalStrength()")) {
            return;
        }
        synchronized (mRecords) {
            mSignalStrength = signalStrength;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) != 0) {
                    try {
                        r.callback.onSignalStrengthsChanged(new SignalStrength(signalStrength));
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
                if ((r.events & PhoneStateListener.LISTEN_SIGNAL_STRENGTH) != 0) {
                    try {
                        int gsmSignalStrength = signalStrength.getGsmSignalStrength();
                        r.callback.onSignalStrengthChanged((gsmSignalStrength == 99 ? -1
                                : gsmSignalStrength));
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastSignalStrengthChanged(signalStrength);
    }

    public void notifyCellInfo(List<CellInfo> cellInfo) {
        if (!checkNotifyPermission("notifyCellInfo()")) {
            return;
        }

        synchronized (mRecords) {
            mCellInfo = cellInfo;
            for (Record r : mRecords) {
                if (validateEventsAndUserLocked(r, PhoneStateListener.LISTEN_CELL_INFO)) {
                    try {
                        if (DBG_LOC) {
                            Slog.d(TAG, "notifyCellInfo: mCellInfo=" + mCellInfo + " r=" + r);
                        }
                        r.callback.onCellInfoChanged(cellInfo);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyMessageWaitingChanged(boolean mwi) {
        if (!checkNotifyPermission("notifyMessageWaitingChanged()")) {
            return;
        }
        synchronized (mRecords) {
            mMessageWaiting = mwi;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR) != 0) {
                    try {
                        r.callback.onMessageWaitingIndicatorChanged(mwi);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyCallForwardingChanged(boolean cfi) {
        if (!checkNotifyPermission("notifyCallForwardingChanged()")) {
            return;
        }
        synchronized (mRecords) {
            mCallForwarding = cfi;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR) != 0) {
                    try {
                        r.callback.onCallForwardingIndicatorChanged(cfi);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyDataActivity(int state) {
        if (!checkNotifyPermission("notifyDataActivity()" )) {
            return;
        }
        synchronized (mRecords) {
            mDataActivity = state;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_DATA_ACTIVITY) != 0) {
                    try {
                        r.callback.onDataActivity(state);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyDataConnection(int state, boolean isDataConnectivityPossible,
            String reason, String apn, String apnType, LinkProperties linkProperties,
            LinkCapabilities linkCapabilities, int networkType, boolean roaming) {
        if (!checkNotifyPermission("notifyDataConnection()" )) {
            return;
        }
        if (DBG) {
            Slog.i(TAG, "notifyDataConnection: state=" + state + " isDataConnectivityPossible="
                + isDataConnectivityPossible + " reason='" + reason
                + "' apn='" + apn + "' apnType=" + apnType + " networkType=" + networkType
                + " mRecords.size()=" + mRecords.size() + " mRecords=" + mRecords);
        }
        synchronized (mRecords) {
            boolean modified = false;
            if (state == TelephonyManager.DATA_CONNECTED) {
                if (!mConnectedApns.contains(apnType)) {
                    mConnectedApns.add(apnType);
                    if (mDataConnectionState != state) {
                        mDataConnectionState = state;
                        modified = true;
                    }
                }
            } else {
                if (mConnectedApns.remove(apnType)) {
                    if (mConnectedApns.isEmpty()) {
                        mDataConnectionState = state;
                        modified = true;
                    } else {
                        // leave mDataConnectionState as is and
                        // send out the new status for the APN in question.
                    }
                }
            }
            mDataConnectionPossible = isDataConnectivityPossible;
            mDataConnectionReason = reason;
            mDataConnectionLinkProperties = linkProperties;
            mDataConnectionLinkCapabilities = linkCapabilities;
            if (mDataConnectionNetworkType != networkType) {
                mDataConnectionNetworkType = networkType;
                // need to tell registered listeners about the new network type
                modified = true;
            }
            if (modified) {
                if (DBG) {
                    Slog.d(TAG, "onDataConnectionStateChanged(" + mDataConnectionState
                        + ", " + mDataConnectionNetworkType + ")");
                }
                for (Record r : mRecords) {
                    if ((r.events & PhoneStateListener.LISTEN_DATA_CONNECTION_STATE) != 0) {
                        try {
                            r.callback.onDataConnectionStateChanged(mDataConnectionState,
                                    mDataConnectionNetworkType);
                        } catch (RemoteException ex) {
                            mRemoveList.add(r.binder);
                        }
                    }
                }
                handleRemoveListLocked();
            }
            mPreciseDataConnectionState = new PreciseDataConnectionState(state, networkType,
                    apnType, apn, reason, linkProperties, "");
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_PRECISE_DATA_CONNECTION_STATE) != 0) {
                    try {
                        r.callback.onPreciseDataConnectionStateChanged(mPreciseDataConnectionState);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastDataConnectionStateChanged(state, isDataConnectivityPossible, reason, apn,
                apnType, linkProperties, linkCapabilities, roaming);
        broadcastPreciseDataConnectionStateChanged(state, networkType, apnType, apn, reason,
                linkProperties, "");
    }

    public void notifyDataConnectionFailed(String reason, String apnType) {
        if (!checkNotifyPermission("notifyDataConnectionFailed()")) {
            return;
        }
        synchronized (mRecords) {
            mPreciseDataConnectionState = new PreciseDataConnectionState(
                    TelephonyManager.DATA_UNKNOWN,TelephonyManager.NETWORK_TYPE_UNKNOWN,
                    apnType, "", reason, null, "");
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_PRECISE_DATA_CONNECTION_STATE) != 0) {
                    try {
                        r.callback.onPreciseDataConnectionStateChanged(mPreciseDataConnectionState);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastDataConnectionFailed(reason, apnType);
        broadcastPreciseDataConnectionStateChanged(TelephonyManager.DATA_UNKNOWN,
                TelephonyManager.NETWORK_TYPE_UNKNOWN, apnType, "", reason, null, "");
    }

    public void notifyCellLocation(Bundle cellLocation) {
        if (!checkNotifyPermission("notifyCellLocation()")) {
            return;
        }
        synchronized (mRecords) {
            mCellLocation = cellLocation;
            for (Record r : mRecords) {
                if (validateEventsAndUserLocked(r, PhoneStateListener.LISTEN_CELL_LOCATION)) {
                    try {
                        if (DBG_LOC) {
                            Slog.d(TAG, "notifyCellLocation: mCellLocation=" + mCellLocation
                                    + " r=" + r);
                        }
                        r.callback.onCellLocationChanged(new Bundle(cellLocation));
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }

                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyOtaspChanged(int otaspMode) {
        if (!checkNotifyPermission("notifyOtaspChanged()" )) {
            return;
        }
        synchronized (mRecords) {
            mOtaspMode = otaspMode;
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_OTASP_CHANGED) != 0) {
                    try {
                        r.callback.onOtaspChanged(otaspMode);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
    }

    public void notifyPreciseCallState(int ringingCallState, int foregroundCallState,
            int backgroundCallState) {
        if (!checkNotifyPermission("notifyPreciseCallState()")) {
            return;
        }
        synchronized (mRecords) {
            mRingingCallState = ringingCallState;
            mForegroundCallState = foregroundCallState;
            mBackgroundCallState = backgroundCallState;
            mPreciseCallState = new PreciseCallState(ringingCallState, foregroundCallState,
                    backgroundCallState,
                    DisconnectCause.NOT_VALID,
                    PreciseDisconnectCause.NOT_VALID);
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_PRECISE_CALL_STATE) != 0) {
                    try {
                        r.callback.onPreciseCallStateChanged(mPreciseCallState);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastPreciseCallStateChanged(ringingCallState, foregroundCallState, backgroundCallState,
                DisconnectCause.NOT_VALID,
                PreciseDisconnectCause.NOT_VALID);
    }

    public void notifyDisconnectCause(int disconnectCause, int preciseDisconnectCause) {
        if (!checkNotifyPermission("notifyDisconnectCause()")) {
            return;
        }
        synchronized (mRecords) {
            mPreciseCallState = new PreciseCallState(mRingingCallState, mForegroundCallState,
                    mBackgroundCallState, disconnectCause, preciseDisconnectCause);
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_PRECISE_CALL_STATE) != 0) {
                    try {
                        r.callback.onPreciseCallStateChanged(mPreciseCallState);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastPreciseCallStateChanged(mRingingCallState, mForegroundCallState,
                mBackgroundCallState, disconnectCause, preciseDisconnectCause);
    }

    public void notifyPreciseDataConnectionFailed(String reason, String apnType,
            String apn, String failCause) {
        if (!checkNotifyPermission("notifyPreciseDataConnectionFailed()")) {
            return;
        }
        synchronized (mRecords) {
            mPreciseDataConnectionState = new PreciseDataConnectionState(
                    TelephonyManager.DATA_UNKNOWN, TelephonyManager.NETWORK_TYPE_UNKNOWN,
                    apnType, apn, reason, null, failCause);
            for (Record r : mRecords) {
                if ((r.events & PhoneStateListener.LISTEN_PRECISE_DATA_CONNECTION_STATE) != 0) {
                    try {
                        r.callback.onPreciseDataConnectionStateChanged(mPreciseDataConnectionState);
                    } catch (RemoteException ex) {
                        mRemoveList.add(r.binder);
                    }
                }
            }
            handleRemoveListLocked();
        }
        broadcastPreciseDataConnectionStateChanged(TelephonyManager.DATA_UNKNOWN,
                TelephonyManager.NETWORK_TYPE_UNKNOWN, apnType, apn, reason, null, failCause);
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                != PackageManager.PERMISSION_GRANTED) {
            pw.println("Permission Denial: can't dump telephony.registry from from pid="
                    + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid());
            return;
        }
        synchronized (mRecords) {
            final int recordCount = mRecords.size();
            pw.println("last known state:");
            pw.println("  mCallState=" + mCallState);
            pw.println("  mCallIncomingNumber=" + mCallIncomingNumber);
            pw.println("  mServiceState=" + mServiceState);
            pw.println("  mSignalStrength=" + mSignalStrength);
            pw.println("  mMessageWaiting=" + mMessageWaiting);
            pw.println("  mCallForwarding=" + mCallForwarding);
            pw.println("  mDataActivity=" + mDataActivity);
            pw.println("  mDataConnectionState=" + mDataConnectionState);
            pw.println("  mDataConnectionPossible=" + mDataConnectionPossible);
            pw.println("  mDataConnectionReason=" + mDataConnectionReason);
            pw.println("  mDataConnectionApn=" + mDataConnectionApn);
            pw.println("  mDataConnectionLinkProperties=" + mDataConnectionLinkProperties);
            pw.println("  mDataConnectionLinkCapabilities=" + mDataConnectionLinkCapabilities);
            pw.println("  mCellLocation=" + mCellLocation);
            pw.println("  mCellInfo=" + mCellInfo);
            pw.println("registrations: count=" + recordCount);
            for (Record r : mRecords) {
                pw.println("  " + r.pkgForDebug + " 0x" + Integer.toHexString(r.events));
            }
        }
    }

    //
    // the legacy intent broadcasting
    //

    private void broadcastServiceStateChanged(ServiceState state) {
        long ident = Binder.clearCallingIdentity();
        try {
            mBatteryStats.notePhoneState(state.getState());
        } catch (RemoteException re) {
            // Can't do much
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        Intent intent = new Intent(TelephonyIntents.ACTION_SERVICE_STATE_CHANGED);
        Bundle data = new Bundle();
        state.fillInNotifierBundle(data);
        intent.putExtras(data);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void broadcastSignalStrengthChanged(SignalStrength signalStrength) {
        long ident = Binder.clearCallingIdentity();
        try {
            mBatteryStats.notePhoneSignalStrength(signalStrength);
        } catch (RemoteException e) {
            /* The remote entity disappeared, we can safely ignore the exception. */
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        Intent intent = new Intent(TelephonyIntents.ACTION_SIGNAL_STRENGTH_CHANGED);
        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
        Bundle data = new Bundle();
        signalStrength.fillInNotifierBundle(data);
        intent.putExtras(data);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void broadcastCallStateChanged(int state, String incomingNumber) {
        long ident = Binder.clearCallingIdentity();
        try {
            if (state == TelephonyManager.CALL_STATE_IDLE) {
                mBatteryStats.notePhoneOff();
            } else {
                mBatteryStats.notePhoneOn();
            }
        } catch (RemoteException e) {
            /* The remote entity disappeared, we can safely ignore the exception. */
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        Intent intent = new Intent(TelephonyManager.ACTION_PHONE_STATE_CHANGED);
        intent.putExtra(PhoneConstants.STATE_KEY,
                DefaultPhoneNotifier.convertCallState(state).toString());
        if (!TextUtils.isEmpty(incomingNumber)) {
            intent.putExtra(TelephonyManager.EXTRA_INCOMING_NUMBER, incomingNumber);
        }
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL,
                android.Manifest.permission.READ_PHONE_STATE);
    }

    private void broadcastDataConnectionStateChanged(int state,
            boolean isDataConnectivityPossible,
            String reason, String apn, String apnType, LinkProperties linkProperties,
            LinkCapabilities linkCapabilities, boolean roaming) {
        // Note: not reporting to the battery stats service here, because the
        // status bar takes care of that after taking into account all of the
        // required info.
        Intent intent = new Intent(TelephonyIntents.ACTION_ANY_DATA_CONNECTION_STATE_CHANGED);
        intent.putExtra(PhoneConstants.STATE_KEY,
                DefaultPhoneNotifier.convertDataState(state).toString());
        if (!isDataConnectivityPossible) {
            intent.putExtra(PhoneConstants.NETWORK_UNAVAILABLE_KEY, true);
        }
        if (reason != null) {
            intent.putExtra(PhoneConstants.STATE_CHANGE_REASON_KEY, reason);
        }
        if (linkProperties != null) {
            intent.putExtra(PhoneConstants.DATA_LINK_PROPERTIES_KEY, linkProperties);
            String iface = linkProperties.getInterfaceName();
            if (iface != null) {
                intent.putExtra(PhoneConstants.DATA_IFACE_NAME_KEY, iface);
            }
        }
        if (linkCapabilities != null) {
            intent.putExtra(PhoneConstants.DATA_LINK_CAPABILITIES_KEY, linkCapabilities);
        }
        if (roaming) intent.putExtra(PhoneConstants.DATA_NETWORK_ROAMING_KEY, true);

        intent.putExtra(PhoneConstants.DATA_APN_KEY, apn);
        intent.putExtra(PhoneConstants.DATA_APN_TYPE_KEY, apnType);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void broadcastDataConnectionFailed(String reason, String apnType) {
        Intent intent = new Intent(TelephonyIntents.ACTION_DATA_CONNECTION_FAILED);
        intent.putExtra(PhoneConstants.FAILURE_REASON_KEY, reason);
        intent.putExtra(PhoneConstants.DATA_APN_TYPE_KEY, apnType);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void broadcastPreciseCallStateChanged(int ringingCallState, int foregroundCallState,
            int backgroundCallState, int disconnectCause, int preciseDisconnectCause) {
        Intent intent = new Intent(TelephonyManager.ACTION_PRECISE_CALL_STATE_CHANGED);
        intent.putExtra(TelephonyManager.EXTRA_RINGING_CALL_STATE, ringingCallState);
        intent.putExtra(TelephonyManager.EXTRA_FOREGROUND_CALL_STATE, foregroundCallState);
        intent.putExtra(TelephonyManager.EXTRA_BACKGROUND_CALL_STATE, backgroundCallState);
        intent.putExtra(TelephonyManager.EXTRA_DISCONNECT_CAUSE, disconnectCause);
        intent.putExtra(TelephonyManager.EXTRA_PRECISE_DISCONNECT_CAUSE, preciseDisconnectCause);
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL,
                android.Manifest.permission.READ_PRECISE_PHONE_STATE);
    }

    private void broadcastPreciseDataConnectionStateChanged(int state, int networkType,
            String apnType, String apn, String reason, LinkProperties linkProperties, String failCause) {
        Intent intent = new Intent(TelephonyManager.ACTION_PRECISE_DATA_CONNECTION_STATE_CHANGED);
        intent.putExtra(PhoneConstants.STATE_KEY, state);
        intent.putExtra(PhoneConstants.DATA_NETWORK_TYPE_KEY, networkType);
        if (reason != null) intent.putExtra(PhoneConstants.STATE_CHANGE_REASON_KEY, reason);
        if (apnType != null) intent.putExtra(PhoneConstants.DATA_APN_TYPE_KEY, apnType);
        if (apn != null) intent.putExtra(PhoneConstants.DATA_APN_KEY, apn);
        if (linkProperties != null) intent.putExtra(PhoneConstants.DATA_LINK_PROPERTIES_KEY, linkProperties);
        if (failCause != null) intent.putExtra(PhoneConstants.DATA_FAILURE_CAUSE_KEY, failCause);

        mContext.sendBroadcastAsUser(intent, UserHandle.ALL,
                android.Manifest.permission.READ_PRECISE_PHONE_STATE);
    }

    private boolean checkNotifyPermission(String method) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
                == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        String msg = "Modify Phone State Permission Denial: " + method + " from pid="
                + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid();
        if (DBG) Slog.w(TAG, msg);
        return false;
    }

    private void checkListenerPermission(int events) {
        if ((events & PhoneStateListener.LISTEN_CELL_LOCATION) != 0) {
            mContext.enforceCallingOrSelfPermission(
                    android.Manifest.permission.ACCESS_COARSE_LOCATION, null);

        }

        if ((events & PhoneStateListener.LISTEN_CELL_INFO) != 0) {
            mContext.enforceCallingOrSelfPermission(
                    android.Manifest.permission.ACCESS_COARSE_LOCATION, null);

        }

        if ((events & PHONE_STATE_PERMISSION_MASK) != 0) {
            mContext.enforceCallingOrSelfPermission(
                    android.Manifest.permission.READ_PHONE_STATE, null);
        }

        if ((events & PRECISE_PHONE_STATE_PERMISSION_MASK) != 0) {
            mContext.enforceCallingOrSelfPermission(
                    android.Manifest.permission.READ_PRECISE_PHONE_STATE, null);

        }
    }

    private void handleRemoveListLocked() {
        if (mRemoveList.size() > 0) {
            for (IBinder b: mRemoveList) {
                remove(b);
            }
            mRemoveList.clear();
        }
    }

    private boolean validateEventsAndUserLocked(Record r, int events) {
        int foregroundUser;
        long callingIdentity = Binder.clearCallingIdentity();
        boolean valid = false;
        try {
            foregroundUser = ActivityManager.getCurrentUser();
            valid = r.callerUid ==  foregroundUser && (r.events & events) != 0;
            if (DBG | DBG_LOC) {
                Slog.d(TAG, "validateEventsAndUserLocked: valid=" + valid
                        + " r.callerUid=" + r.callerUid + " foregroundUser=" + foregroundUser
                        + " r.events=" + r.events + " events=" + events);
            }
        } finally {
            Binder.restoreCallingIdentity(callingIdentity);
        }
        return valid;
    }
}