/*
* 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;
import android.content.AsyncQueryHandler;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.provider.Contacts;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;
/**
* ASYNCHRONOUS QUERY API
*/
public class CallerInfoAsyncQuery {
private static final boolean DBG = false;
private static final String LOG_TAG = "CallerInfoAsyncQuery";
private static final int EVENT_NEW_QUERY = 1;
private static final int EVENT_ADD_LISTENER = 2;
private static final int EVENT_END_OF_QUEUE = 3;
private static final int EVENT_EMERGENCY_NUMBER = 4;
private static final int EVENT_VOICEMAIL_NUMBER = 5;
private CallerInfoAsyncQueryHandler mHandler;
// Don't keep checking VM if it's going to throw an exception for this proc.
private static boolean sSkipVmCheck = false;
/**
* Interface for a CallerInfoAsyncQueryHandler result return.
*/
public interface OnQueryCompleteListener {
/**
* Called when the query is complete.
*/
public void onQueryComplete(int token, Object cookie, CallerInfo ci);
}
/**
* Wrap the cookie from the WorkerArgs with additional information needed by our
* classes.
*/
private static final class CookieWrapper {
public OnQueryCompleteListener listener;
public Object cookie;
public int event;
public String number;
}
/**
* Simple exception used to communicate problems with the query pool.
*/
public static class QueryPoolException extends SQLException {
public QueryPoolException(String error) {
super(error);
}
}
/**
* Our own implementation of the AsyncQueryHandler.
*/
private class CallerInfoAsyncQueryHandler extends AsyncQueryHandler {
/**
* The information relevant to each CallerInfo query. Each query may have multiple
* listeners, so each AsyncCursorInfo is associated with 2 or more CookieWrapper
* objects in the queue (one with a new query event, and one with a end event, with
* 0 or more additional listeners in between).
*/
private Context mQueryContext;
private Uri mQueryUri;
private CallerInfo mCallerInfo;
/**
* Our own query worker thread.
*
* This thread handles the messages enqueued in the looper. The normal sequence
* of events is that a new query shows up in the looper queue, followed by 0 or
* more add listener requests, and then an end request. Of course, these requests
* can be interlaced with requests from other tokens, but is irrelevant to this
* handler since the handler has no state.
*
* Note that we depend on the queue to keep things in order; in other words, the
* looper queue must be FIFO with respect to input from the synchronous startQuery
* calls and output to this handleMessage call.
*
* This use of the queue is required because CallerInfo objects may be accessed
* multiple times before the query is complete. All accesses (listeners) must be
* queued up and informed in order when the query is complete.
*/
protected class CallerInfoWorkerHandler extends WorkerHandler {
public CallerInfoWorkerHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
WorkerArgs args = (WorkerArgs) msg.obj;
CookieWrapper cw = (CookieWrapper) args.cookie;
if (cw == null) {
// Normally, this should never be the case for calls originating
// from within this code.
// However, if there is any code that this Handler calls (such as in
// super.handleMessage) that DOES place unexpected messages on the
// queue, then we need pass these messages on.
if (DBG) log("Unexpected command (CookieWrapper is null): " + msg.what +
" ignored by CallerInfoWorkerHandler, passing onto parent.");
super.handleMessage(msg);
} else {
if (DBG) log("Processing event: " + cw.event + " token (arg1): " + msg.arg1 +
" command: " + msg.what + " query URI: " + args.uri);
switch (cw.event) {
case EVENT_NEW_QUERY:
//start the sql command.
super.handleMessage(msg);
break;
// shortcuts to avoid query for recognized numbers.
case EVENT_EMERGENCY_NUMBER:
case EVENT_VOICEMAIL_NUMBER:
case EVENT_ADD_LISTENER:
case EVENT_END_OF_QUEUE:
// query was already completed, so just send the reply.
// passing the original token value back to the caller
// on top of the event values in arg1.
Message reply = args.handler.obtainMessage(msg.what);
reply.obj = args;
reply.arg1 = msg.arg1;
reply.sendToTarget();
break;
default:
}
}
}
}
/**
* Asynchronous query handler class for the contact / callerinfo object.
*/
private CallerInfoAsyncQueryHandler(Context context) {
super(context.getContentResolver());
}
@Override
protected Handler createHandler(Looper looper) {
return new CallerInfoWorkerHandler(looper);
}
/**
* Overrides onQueryComplete from AsyncQueryHandler.
*
* This method takes into account the state of this class; we construct the CallerInfo
* object only once for each set of listeners. When the query thread has done its work
* and calls this method, we inform the remaining listeners in the queue, until we're
* out of listeners. Once we get the message indicating that we should expect no new
* listeners for this CallerInfo object, we release the AsyncCursorInfo back into the
* pool.
*/
@Override
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
if (DBG) log("query complete for token: " + token);
//get the cookie and notify the listener.
CookieWrapper cw = (CookieWrapper) cookie;
if (cw == null) {
// Normally, this should never be the case for calls originating
// from within this code.
// However, if there is any code that calls this method, we should
// check the parameters to make sure they're viable.
if (DBG) log("Cookie is null, ignoring onQueryComplete() request.");
return;
}
if (cw.event == EVENT_END_OF_QUEUE) {
release();
return;
}
// check the token and if needed, create the callerinfo object.
if (mCallerInfo == null) {
if ((mQueryContext == null) || (mQueryUri == null)) {
throw new QueryPoolException
("Bad context or query uri, or CallerInfoAsyncQuery already released.");
}
// adjust the callerInfo data as needed, and only if it was set from the
// initial query request.
// Change the callerInfo number ONLY if it is an emergency number or the
// voicemail number, and adjust other data (including photoResource)
// accordingly.
if (cw.event == EVENT_EMERGENCY_NUMBER) {
mCallerInfo = new CallerInfo();
// Note we're setting the phone number here (refer to javadoc
// comments at the top of CallerInfo class).
mCallerInfo.phoneNumber = mQueryContext.getString(com.android.internal
.R.string.emergency_call_dialog_number_for_display);
mCallerInfo.photoResource = com.android.internal.R.drawable.picture_emergency;
} else if (cw.event == EVENT_VOICEMAIL_NUMBER) {
mCallerInfo = new CallerInfo();
try {
// Note we're setting the phone number here (refer to javadoc
// comments at the top of CallerInfo class).
mCallerInfo.phoneNumber =
TelephonyManager.getDefault().getVoiceMailAlphaTag();
} catch (SecurityException ex) {
// Should never happen: if this process does not have
// permission to retrieve VM tag, it should not have
// permission to retrieve VM number and would not generate
// an EVENT_VOICEMAIL_NUMBER. But if it happens, don't crash.
}
} else {
mCallerInfo = CallerInfo.getCallerInfo(mQueryContext, mQueryUri, cursor);
// Use the number entered by the user for display.
if (!TextUtils.isEmpty(cw.number)) {
mCallerInfo.phoneNumber = PhoneNumberUtils.formatNumber(cw.number);
}
}
if (DBG) log("constructing CallerInfo object for token: " + token);
//notify that we can clean up the queue after this.
CookieWrapper endMarker = new CookieWrapper();
endMarker.event = EVENT_END_OF_QUEUE;
startQuery (token, endMarker, null, null, null, null, null);
}
//notify the listener that the query is complete.
if (cw.listener != null) {
if (DBG) log("notifying listener: " + cw.listener.getClass().toString() +
" for token: " + token);
cw.listener.onQueryComplete(token, cw.cookie, mCallerInfo);
}
}
}
/**
* Private constructor for factory methods.
*/
private CallerInfoAsyncQuery() {
}
/**
* Factory method to start query with a Uri query spec
*/
public static CallerInfoAsyncQuery startQuery(int token, Context context, Uri contactRef,
OnQueryCompleteListener listener, Object cookie) {
CallerInfoAsyncQuery c = new CallerInfoAsyncQuery();
c.allocate(context, contactRef);
if (DBG) log("starting query for URI: " + contactRef + " handler: " + c.toString());
//create cookieWrapper, start query
CookieWrapper cw = new CookieWrapper();
cw.listener = listener;
cw.cookie = cookie;
cw.event = EVENT_NEW_QUERY;
c.mHandler.startQuery (token, cw, contactRef, null, null, null, null);
return c;
}
/**
* Factory method to start query with a number
*/
public static CallerInfoAsyncQuery startQuery(int token, Context context, String number,
OnQueryCompleteListener listener, Object cookie) {
//contruct the URI object and start Query.
Uri contactRef = Uri.withAppendedPath(Contacts.Phones.CONTENT_FILTER_URL, number);
CallerInfoAsyncQuery c = new CallerInfoAsyncQuery();
c.allocate(context, contactRef);
if (DBG) log("starting query for number: " + number + " handler: " + c.toString());
//create cookieWrapper, start query
CookieWrapper cw = new CookieWrapper();
cw.listener = listener;
cw.cookie = cookie;
cw.number = number;
// check to see if these are recognized numbers, and use shortcuts if we can.
if (PhoneNumberUtils.isEmergencyNumber(number)) {
cw.event = EVENT_EMERGENCY_NUMBER;
} else {
String vmNumber = null;
if (!sSkipVmCheck){
try {
vmNumber = TelephonyManager.getDefault().getVoiceMailNumber();
} catch (SecurityException ex) {
// Don't crash if this process doesn't have permission to
// retrieve VM number. It's still allowed to look up caller info.
// But don't try it again.
sSkipVmCheck = true;
}
}
if (PhoneNumberUtils.compare(number, vmNumber)) {
cw.event = EVENT_VOICEMAIL_NUMBER;
} else {
cw.event = EVENT_NEW_QUERY;
}
}
c.mHandler.startQuery (token, cw, contactRef, null, null, null, null);
return c;
}
/**
* Method to add listeners to a currently running query
*/
public void addQueryListener(int token, OnQueryCompleteListener listener, Object cookie) {
if (DBG) log("adding listener to query: " + mHandler.mQueryUri + " handler: " +
mHandler.toString());
//create cookieWrapper, add query request to end of queue.
CookieWrapper cw = new CookieWrapper();
cw.listener = listener;
cw.cookie = cookie;
cw.event = EVENT_ADD_LISTENER;
mHandler.startQuery (token, cw, null, null, null, null, null);
}
/**
* Method to create a new CallerInfoAsyncQueryHandler object, ensuring correct
* state of context and uri.
*/
private void allocate (Context context, Uri contactRef) {
if ((context == null) || (contactRef == null)){
throw new QueryPoolException("Bad context or query uri.");
}
mHandler = new CallerInfoAsyncQueryHandler(context);
mHandler.mQueryContext = context;
mHandler.mQueryUri = contactRef;
}
/**
* Releases the relevant data.
*/
private void release () {
mHandler.mQueryContext = null;
mHandler.mQueryUri = null;
mHandler.mCallerInfo = null;
mHandler = null;
}
/**
* static logging method
*/
private static void log(String msg) {
Log.d(LOG_TAG, msg);
}
}
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