async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.annotation.SuppressLint;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23 import android.os.OperationCanceledException;
  24
  25 import net.ktnx.mobileledger.App;
  26 import net.ktnx.mobileledger.err.HTTPException;
  27 import net.ktnx.mobileledger.json.AccountListParser;
  28 import net.ktnx.mobileledger.json.ParsedBalance;
  29 import net.ktnx.mobileledger.json.ParsedLedgerAccount;
  30 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  31 import net.ktnx.mobileledger.json.TransactionListParser;
  32 import net.ktnx.mobileledger.model.Data;
  33 import net.ktnx.mobileledger.model.LedgerAccount;
  34 import net.ktnx.mobileledger.model.LedgerTransaction;
  35 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  36 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  37 import net.ktnx.mobileledger.ui.activity.MainActivity;
  38 import net.ktnx.mobileledger.utils.NetworkUtil;
  39
  40 import java.io.BufferedReader;
  41 import java.io.IOException;
  42 import java.io.InputStream;
  43 import java.io.InputStreamReader;
  44 import java.lang.ref.WeakReference;
  45 import java.net.HttpURLConnection;
  46 import java.net.MalformedURLException;
  47 import java.net.URLDecoder;
  48 import java.nio.charset.StandardCharsets;
  49 import java.text.ParseException;
  50 import java.util.ArrayList;
  51 import java.util.HashMap;
  52 import java.util.Locale;
  53 import java.util.Stack;
  54 import java.util.regex.Matcher;
  55 import java.util.regex.Pattern;
  56
  57 import androidx.annotation.NonNull;
  58
  59 import static net.ktnx.mobileledger.utils.Logger.debug;
  60
  61
  62 public class RetrieveTransactionsTask
  63         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  64     private static final int MATCHING_TRANSACTIONS_LIMIT = 150;
  65     private static final Pattern reComment = Pattern.compile("^\\s*;");
  66     private static final Pattern reTransactionStart = Pattern.compile("<tr class=\"title\" " +
  67                                                                       "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  68     private static final Pattern reTransactionDescription =
  69             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  70     private static final Pattern reTransactionDetails =
  71             Pattern.compile("^\\s+(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  72     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  73     private WeakReference<MainActivity> contextRef;
  74     // %3A is '='
  75     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  76     private Pattern reAccountValue = Pattern.compile(
  77             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  78     private MobileLedgerProfile profile;
  79     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef,
  80                                     @NonNull MobileLedgerProfile profile) {
  81         this.contextRef = contextRef;
  82         this.profile = profile;
  83     }
  84     private static void L(String msg) {
  85         //debug("transaction-parser", msg);
  86     }
  87     @Override
  88     protected void onProgressUpdate(Progress... values) {
  89         super.onProgressUpdate(values);
  90         MainActivity context = getContext();
  91         if (context == null) return;
  92         context.onRetrieveProgress(values[0]);
  93     }
  94     @Override
  95     protected void onPreExecute() {
  96         super.onPreExecute();
  97         MainActivity context = getContext();
  98         if (context == null) return;
  99         context.onRetrieveStart();
 100     }
 101     @Override
 102     protected void onPostExecute(String error) {
 103         super.onPostExecute(error);
 104         MainActivity context = getContext();
 105         if (context == null) return;
 106         context.onRetrieveDone(error);
 107     }
 108     @Override
 109     protected void onCancelled() {
 110         super.onCancelled();
 111         MainActivity context = getContext();
 112         if (context == null) return;
 113         context.onRetrieveDone(null);
 114     }
 115     private String retrieveTransactionListLegacy()
 116             throws IOException, ParseException, HTTPException {
 117         Progress progress = new Progress();
 118         int maxTransactionId = Progress.INDETERMINATE;
 119         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 120         HashMap<String, Void> accountNames = new HashMap<>();
 121         HashMap<String, LedgerAccount> syntheticAccounts = new HashMap<>();
 122         LedgerAccount lastAccount = null, prevAccount = null;
 123         boolean onlyStarred = Data.optShowOnlyStarred.get();
 124
 125         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 126         http.setAllowUserInteraction(false);
 127         publishProgress(progress);
 128         switch (http.getResponseCode()) {
 129             case 200:
 130                 break;
 131             default:
 132                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 133         }
 134
 135         SQLiteDatabase db = App.getDatabase();
 136         try (InputStream resp = http.getInputStream()) {
 137             if (http.getResponseCode() != 200)
 138                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 139             db.beginTransaction();
 140             try {
 141                 prepareDbForRetrieval(db, profile);
 142
 143                 int matchedTransactionsCount = 0;
 144
 145
 146                 ParserState state = ParserState.EXPECTING_ACCOUNT;
 147                 String line;
 148                 BufferedReader buf =
 149                         new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 150
 151                 int processedTransactionCount = 0;
 152                 int transactionId = 0;
 153                 LedgerTransaction transaction = null;
 154                 LINES:
 155                 while ((line = buf.readLine()) != null) {
 156                     throwIfCancelled();
 157                     Matcher m;
 158                     m = reComment.matcher(line);
 159                     if (m.find()) {
 160                         // TODO: comments are ignored for now
 161 //                            Log.v("transaction-parser", "Ignoring comment");
 162                         continue;
 163                     }
 164                     //L(String.format("State is %d", updating));
 165                     switch (state) {
 166                         case EXPECTING_ACCOUNT:
 167                             if (line.equals("<h2>General Journal</h2>")) {
 168                                 state = ParserState.EXPECTING_TRANSACTION;
 169                                 L("→ expecting transaction");
 170                                 // commit the current transaction and start a new one
 171                                 // the account list in the UI should reflect the (committed)
 172                                 // state of the database
 173                                 db.setTransactionSuccessful();
 174                                 db.endTransaction();
 175                                 Data.accounts.setList(accountList);
 176                                 db.beginTransaction();
 177                                 continue;
 178                             }
 179                             m = reAccountName.matcher(line);
 180                             if (m.find()) {
 181                                 String acct_encoded = m.group(1);
 182                                 String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 183                                 acct_name = acct_name.replace("\"", "");
 184                                 L(String.format("found account: %s", acct_name));
 185
 186                                 prevAccount = lastAccount;
 187                                 lastAccount = profile.tryLoadAccount(db, acct_name);
 188                                 if (lastAccount == null) lastAccount = new LedgerAccount(acct_name);
 189                                 else lastAccount.removeAmounts();
 190                                 profile.storeAccount(db, lastAccount);
 191
 192                                 if (prevAccount != null) prevAccount
 193                                         .setHasSubAccounts(prevAccount.isParentOf(lastAccount));
 194                                 // make sure the parent account(s) are present,
 195                                 // synthesising them if necessary
 196                                 // this happens when the (missing-in-HTML) parent account has
 197                                 // only one child so we create a synthetic parent account record,
 198                                 // copying the amounts when child's amounts are parsed
 199                                 String parentName = lastAccount.getParentName();
 200                                 if (parentName != null) {
 201                                     Stack<String> toAppend = new Stack<>();
 202                                     while (parentName != null) {
 203                                         if (accountNames.containsKey(parentName)) break;
 204                                         toAppend.push(parentName);
 205                                         parentName = new LedgerAccount(parentName).getParentName();
 206                                     }
 207                                     syntheticAccounts.clear();
 208                                     while (!toAppend.isEmpty()) {
 209                                         String aName = toAppend.pop();
 210                                         LedgerAccount acc = profile.tryLoadAccount(db, aName);
 211                                         if (acc == null) {
 212                                             acc = new LedgerAccount(aName);
 213                                             acc.setHiddenByStar(lastAccount.isHiddenByStar());
 214                                             acc.setExpanded(!lastAccount.hasSubAccounts() ||
 215                                                             lastAccount.isExpanded());
 216                                         }
 217                                         acc.setHasSubAccounts(true);
 218                                         acc.removeAmounts();    // filled below when amounts are parsed
 219                                         if ((!onlyStarred || !acc.isHiddenByStar()) &&
 220                                             acc.isVisible(accountList)) accountList.add(acc);
 221                                         L(String.format("gap-filling with %s", aName));
 222                                         accountNames.put(aName, null);
 223                                         profile.storeAccount(db, acc);
 224                                         syntheticAccounts.put(aName, acc);
 225                                     }
 226                                 }
 227
 228                                 if ((!onlyStarred || !lastAccount.isHiddenByStar()) &&
 229                                     lastAccount.isVisible(accountList))
 230                                     accountList.add(lastAccount);
 231                                 accountNames.put(acct_name, null);
 232
 233                                 state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 234                                 L("→ expecting account amount");
 235                             }
 236                             break;
 237
 238                         case EXPECTING_ACCOUNT_AMOUNT:
 239                             m = reAccountValue.matcher(line);
 240                             boolean match_found = false;
 241                             while (m.find()) {
 242                                 throwIfCancelled();
 243
 244                                 match_found = true;
 245                                 String value = m.group(1);
 246                                 String currency = m.group(2);
 247                                 if (currency == null) currency = "";
 248                                 value = value.replace(',', '.');
 249                                 L("curr=" + currency + ", value=" + value);
 250                                 final float val = Float.parseFloat(value);
 251                                 profile.storeAccountValue(db, lastAccount.getName(), currency, val);
 252                                 lastAccount.addAmount(val, currency);
 253                                 for (LedgerAccount syn : syntheticAccounts.values()) {
 254                                     L(String.format(Locale.ENGLISH, "propagating %s %1.2f to %s",
 255                                             currency, val, syn.getName()));
 256                                     syn.addAmount(val, currency);
 257                                     profile.storeAccountValue(db, syn.getName(), currency, val);
 258                                 }
 259                             }
 260
 261                             if (match_found) {
 262                                 syntheticAccounts.clear();
 263                                 state = ParserState.EXPECTING_ACCOUNT;
 264                                 L("→ expecting account");
 265                             }
 266
 267                             break;
 268
 269                         case EXPECTING_TRANSACTION:
 270                             if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 271                             m = reTransactionStart.matcher(line);
 272                             if (m.find()) {
 273                                 transactionId = Integer.valueOf(m.group(1));
 274                                 state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 275                                 L(String.format(Locale.ENGLISH,
 276                                         "found transaction %d → expecting description",
 277                                         transactionId));
 278                                 progress.setProgress(++processedTransactionCount);
 279                                 if (maxTransactionId < transactionId)
 280                                     maxTransactionId = transactionId;
 281                                 if ((progress.getTotal() == Progress.INDETERMINATE) ||
 282                                     (progress.getTotal() < transactionId))
 283                                     progress.setTotal(transactionId);
 284                                 publishProgress(progress);
 285                             }
 286                             m = reEnd.matcher(line);
 287                             if (m.find()) {
 288                                 L("--- transaction value complete ---");
 289                                 break LINES;
 290                             }
 291                             break;
 292
 293                         case EXPECTING_TRANSACTION_DESCRIPTION:
 294                             if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 295                             m = reTransactionDescription.matcher(line);
 296                             if (m.find()) {
 297                                 if (transactionId == 0) throw new TransactionParserException(
 298                                         "Transaction Id is 0 while expecting " + "description");
 299
 300                                 String date = m.group(1);
 301                                 try {
 302                                     int equalsIndex = date.indexOf('=');
 303                                     if (equalsIndex >= 0) date = date.substring(equalsIndex + 1);
 304                                     transaction =
 305                                             new LedgerTransaction(transactionId, date, m.group(2));
 306                                 }
 307                                 catch (ParseException e) {
 308                                     e.printStackTrace();
 309                                     return String.format("Error parsing date '%s'", date);
 310                                 }
 311                                 state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 312                                 L(String.format(Locale.ENGLISH,
 313                                         "transaction %d created for %s (%s) →" +
 314                                         " expecting details", transactionId, date, m.group(2)));
 315                             }
 316                             break;
 317
 318                         case EXPECTING_TRANSACTION_DETAILS:
 319                             if (line.isEmpty()) {
 320                                 // transaction data collected
 321                                 if (transaction.existsInDb(db)) {
 322                                     profile.markTransactionAsPresent(db, transaction);
 323                                     matchedTransactionsCount++;
 324
 325                                     if (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT) {
 326                                         profile.markTransactionsBeforeTransactionAsPresent(db,
 327                                                 transaction);
 328                                         progress.setTotal(progress.getProgress());
 329                                         publishProgress(progress);
 330                                         break LINES;
 331                                     }
 332                                 }
 333                                 else {
 334                                     profile.storeTransaction(db, transaction);
 335                                     matchedTransactionsCount = 0;
 336                                     progress.setTotal(maxTransactionId);
 337                                 }
 338
 339                                 state = ParserState.EXPECTING_TRANSACTION;
 340                                 L(String.format("transaction %s saved → expecting transaction",
 341                                         transaction.getId()));
 342                                 transaction.finishLoading();
 343
 344 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 345 // for example, when you add the initial seeding transaction after entering some others
 346 //                                            if (transactionId == 1) {
 347 //                                                L("This was the initial transaction. Terminating " +
 348 //                                                  "parser");
 349 //                                                break LINES;
 350 //                                            }
 351                             }
 352                             else {
 353                                 m = reTransactionDetails.matcher(line);
 354                                 if (m.find()) {
 355                                     String acc_name = m.group(1);
 356                                     String amount = m.group(2);
 357                                     String currency = m.group(3);
 358                                     if (currency == null) currency = "";
 359                                     amount = amount.replace(',', '.');
 360                                     transaction.addAccount(new LedgerTransactionAccount(acc_name,
 361                                             Float.valueOf(amount), currency));
 362                                     L(String.format(Locale.ENGLISH, "%d: %s = %s",
 363                                             transaction.getId(), acc_name, amount));
 364                                 }
 365                                 else throw new IllegalStateException(
 366                                         String.format("Can't parse transaction %d " + "details: %s",
 367                                                 transactionId, line));
 368                             }
 369                             break;
 370                         default:
 371                             throw new RuntimeException(
 372                                     String.format("Unknown parser updating %s", state.name()));
 373                     }
 374                 }
 375
 376                 throwIfCancelled();
 377
 378                 profile.deleteNotPresentTransactions(db);
 379                 db.setTransactionSuccessful();
 380
 381                 profile.setLastUpdateStamp();
 382
 383                 return null;
 384             }
 385             finally {
 386                 db.endTransaction();
 387             }
 388         }
 389     }
 390     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 391         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 392                 new String[]{profile.getUuid()});
 393         db.execSQL("update account_values set keep=0 where profile=?;",
 394                 new String[]{profile.getUuid()});
 395         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 396     }
 397     private boolean retrieveAccountList() throws IOException, HTTPException {
 398         Progress progress = new Progress();
 399
 400         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 401         http.setAllowUserInteraction(false);
 402         switch (http.getResponseCode()) {
 403             case 200:
 404                 break;
 405             case 404:
 406                 return false;
 407             default:
 408                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 409         }
 410         publishProgress(progress);
 411         SQLiteDatabase db = App.getDatabase();
 412         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 413         boolean listFilledOK = false;
 414         try (InputStream resp = http.getInputStream()) {
 415             if (http.getResponseCode() != 200)
 416                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 417
 418             db.beginTransaction();
 419             try {
 420                 profile.markAccountsAsNotPresent(db);
 421
 422                 AccountListParser parser = new AccountListParser(resp);
 423
 424                 LedgerAccount prevAccount = null;
 425
 426                 while (true) {
 427                     throwIfCancelled();
 428                     ParsedLedgerAccount parsedAccount = parser.nextAccount();
 429                     if (parsedAccount == null) break;
 430
 431                     LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 432                     if (acc == null) acc = new LedgerAccount(parsedAccount.getAname());
 433                     else acc.removeAmounts();
 434
 435                     profile.storeAccount(db, acc);
 436                     String lastCurrency = null;
 437                     float lastCurrencyAmount = 0;
 438                     for (ParsedBalance b : parsedAccount.getAibalance()) {
 439                         final String currency = b.getAcommodity();
 440                         final float amount = b.getAquantity().asFloat();
 441                         if (currency.equals(lastCurrency)) lastCurrencyAmount += amount;
 442                         else {
 443                             if (lastCurrency != null) {
 444                                 profile.storeAccountValue(db, acc.getName(), lastCurrency,
 445                                         lastCurrencyAmount);
 446                                 acc.addAmount(lastCurrencyAmount, lastCurrency);
 447                             }
 448                             lastCurrency = currency;
 449                             lastCurrencyAmount = amount;
 450                         }
 451                     }
 452                     if (lastCurrency != null) {
 453                         profile.storeAccountValue(db, acc.getName(), lastCurrency,
 454                                 lastCurrencyAmount);
 455                         acc.addAmount(lastCurrencyAmount, lastCurrency);
 456                     }
 457
 458                     if (acc.isVisible(accountList)) accountList.add(acc);
 459
 460                     if (prevAccount != null) {
 461                         prevAccount.setHasSubAccounts(
 462                                 acc.getName().startsWith(prevAccount.getName() + ":"));
 463                     }
 464
 465                     prevAccount = acc;
 466                 }
 467                 throwIfCancelled();
 468
 469                 profile.deleteNotPresentAccounts(db);
 470                 throwIfCancelled();
 471                 db.setTransactionSuccessful();
 472                 listFilledOK = true;
 473             }
 474             finally {
 475                 db.endTransaction();
 476             }
 477         }
 478         // should not be set in the DB transaction, because of a possible deadlock
 479         // with the main and DbOpQueueRunner threads
 480         if (listFilledOK) Data.accounts.setList(accountList);
 481
 482         return true;
 483     }
 484     private boolean retrieveTransactionList() throws IOException, ParseException, HTTPException {
 485         Progress progress = new Progress();
 486         int maxTransactionId = Progress.INDETERMINATE;
 487
 488         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 489         http.setAllowUserInteraction(false);
 490         publishProgress(progress);
 491         switch (http.getResponseCode()) {
 492             case 200:
 493                 break;
 494             case 404:
 495                 return false;
 496             default:
 497                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 498         }
 499         SQLiteDatabase db = App.getDatabase();
 500         try (InputStream resp = http.getInputStream()) {
 501             if (http.getResponseCode() != 200)
 502                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 503             throwIfCancelled();
 504             db.beginTransaction();
 505             try {
 506                 profile.markTransactionsAsNotPresent(db);
 507
 508                 int matchedTransactionsCount = 0;
 509                 TransactionListParser parser = new TransactionListParser(resp);
 510
 511                 int processedTransactionCount = 0;
 512
 513                 DetectedTransactionOrder transactionOrder = DetectedTransactionOrder.UNKNOWN;
 514                 int orderAccumulator = 0;
 515                 int lastTransactionId = 0;
 516
 517                 while (true) {
 518                     throwIfCancelled();
 519                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 520                     throwIfCancelled();
 521                     if (parsedTransaction == null) break;
 522
 523                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 524                     if (transaction.getId() > lastTransactionId) orderAccumulator++;
 525                     else orderAccumulator--;
 526                     lastTransactionId = transaction.getId();
 527                     if (transactionOrder == DetectedTransactionOrder.UNKNOWN) {
 528                         if (orderAccumulator > 30) {
 529                             transactionOrder = DetectedTransactionOrder.FILE;
 530                             debug("rtt", String.format(Locale.ENGLISH,
 531                                     "Detected native file order after %d transactions (factor %d)",
 532                                     processedTransactionCount, orderAccumulator));
 533                             progress.setTotal(Data.transactions.size());
 534                         }
 535                         else if (orderAccumulator < -30) {
 536                             transactionOrder = DetectedTransactionOrder.REVERSE_CHRONOLOGICAL;
 537                             debug("rtt", String.format(Locale.ENGLISH,
 538                                     "Detected reverse chronological order after %d transactions (factor %d)",
 539                                     processedTransactionCount, orderAccumulator));
 540                         }
 541                     }
 542
 543                     if (transaction.existsInDb(db)) {
 544                         profile.markTransactionAsPresent(db, transaction);
 545                         matchedTransactionsCount++;
 546
 547                         if ((transactionOrder == DetectedTransactionOrder.REVERSE_CHRONOLOGICAL) &&
 548                             (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT))
 549                         {
 550                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 551                             progress.setTotal(progress.getProgress());
 552                             publishProgress(progress);
 553                             db.setTransactionSuccessful();
 554                             profile.setLastUpdateStamp();
 555                             return true;
 556                         }
 557                     }
 558                     else {
 559                         profile.storeTransaction(db, transaction);
 560                         matchedTransactionsCount = 0;
 561                         progress.setTotal(maxTransactionId);
 562                     }
 563
 564
 565                     if ((transactionOrder != DetectedTransactionOrder.UNKNOWN) &&
 566                         ((progress.getTotal() == Progress.INDETERMINATE) ||
 567                          (progress.getTotal() < transaction.getId())))
 568                         progress.setTotal(transaction.getId());
 569
 570                     progress.setProgress(++processedTransactionCount);
 571                     publishProgress(progress);
 572                 }
 573
 574                 throwIfCancelled();
 575                 profile.deleteNotPresentTransactions(db);
 576                 throwIfCancelled();
 577                 db.setTransactionSuccessful();
 578                 profile.setLastUpdateStamp();
 579             }
 580             finally {
 581                 db.endTransaction();
 582             }
 583         }
 584
 585         return true;
 586     }
 587
 588     @SuppressLint("DefaultLocale")
 589     @Override
 590     protected String doInBackground(Void... params) {
 591         Data.backgroundTaskStarted();
 592         try {
 593             if (!retrieveAccountList() || !retrieveTransactionList())
 594                 return retrieveTransactionListLegacy();
 595             return null;
 596         }
 597         catch (MalformedURLException e) {
 598             e.printStackTrace();
 599             return "Invalid server URL";
 600         }
 601         catch (HTTPException e) {
 602             e.printStackTrace();
 603             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 604         }
 605         catch (IOException e) {
 606             e.printStackTrace();
 607             return e.getLocalizedMessage();
 608         }
 609         catch (ParseException e) {
 610             e.printStackTrace();
 611             return "Network error";
 612         }
 613         catch (OperationCanceledException e) {
 614             e.printStackTrace();
 615             return "Operation cancelled";
 616         }
 617         finally {
 618             Data.backgroundTaskFinished();
 619         }
 620     }
 621     private MainActivity getContext() {
 622         return contextRef.get();
 623     }
 624     private void throwIfCancelled() {
 625         if (isCancelled()) throw new OperationCanceledException(null);
 626     }
 627     enum DetectedTransactionOrder {UNKNOWN, REVERSE_CHRONOLOGICAL, FILE}
 628
 629     private enum ParserState {
 630         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 631         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 632     }
 633
 634     public class Progress {
 635         public static final int INDETERMINATE = -1;
 636         private int progress;
 637         private int total;
 638         Progress() {
 639             this(INDETERMINATE, INDETERMINATE);
 640         }
 641         Progress(int progress, int total) {
 642             this.progress = progress;
 643             this.total = total;
 644         }
 645         public int getProgress() {
 646             return progress;
 647         }
 648         protected void setProgress(int progress) {
 649             this.progress = progress;
 650         }
 651         public int getTotal() {
 652             return total;
 653         }
 654         protected void setTotal(int total) {
 655             this.total = total;
 656         }
 657     }
 658
 659     private class TransactionParserException extends IllegalStateException {
 660         TransactionParserException(String message) {
 661             super(message);
 662         }
 663     }
 664 }