app/src/main/java/net/ktnx/mobileledger/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 static net.ktnx.mobileledger.utils.Logger.debug;
  58
  59
  60 public class RetrieveTransactionsTask
  61         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  62     private static final int MATCHING_TRANSACTIONS_LIMIT = 150;
  63     private static final Pattern reComment = Pattern.compile("^\\s*;");
  64     private static final Pattern reTransactionStart = Pattern.compile("<tr class=\"title\" " +
  65                                                                       "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  66     private static final Pattern reTransactionDescription =
  67             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  68     private static final Pattern reTransactionDetails =
  69             Pattern.compile("^\\s+(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  70     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  71     private WeakReference<MainActivity> contextRef;
  72     // %3A is '='
  73     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  74     private Pattern reAccountValue = Pattern.compile(
  75             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  76     private MobileLedgerProfile profile;
  77     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef,
  78                                     MobileLedgerProfile profile) {
  79         this.contextRef = contextRef;
  80         this.profile = profile;
  81     }
  82     private static void L(String msg) {
  83         //debug("transaction-parser", msg);
  84     }
  85     @Override
  86     protected void onProgressUpdate(Progress... values) {
  87         super.onProgressUpdate(values);
  88         MainActivity context = getContext();
  89         if (context == null) return;
  90         context.onRetrieveProgress(values[0]);
  91     }
  92     @Override
  93     protected void onPreExecute() {
  94         super.onPreExecute();
  95         MainActivity context = getContext();
  96         if (context == null) return;
  97         context.onRetrieveStart();
  98     }
  99     @Override
 100     protected void onPostExecute(String error) {
 101         super.onPostExecute(error);
 102         MainActivity context = getContext();
 103         if (context == null) return;
 104         context.onRetrieveDone(error);
 105     }
 106     @Override
 107     protected void onCancelled() {
 108         super.onCancelled();
 109         MainActivity context = getContext();
 110         if (context == null) return;
 111         context.onRetrieveDone(null);
 112     }
 113     private String retrieveTransactionListLegacy()
 114             throws IOException, ParseException, HTTPException {
 115         Progress progress = new Progress();
 116         int maxTransactionId = Progress.INDETERMINATE;
 117         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 118         HashMap<String, Void> accountNames = new HashMap<>();
 119         HashMap<String, LedgerAccount> syntheticAccounts = new HashMap<>();
 120         LedgerAccount lastAccount = null, prevAccount = null;
 121         boolean onlyStarred = Data.optShowOnlyStarred.get();
 122
 123         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 124         http.setAllowUserInteraction(false);
 125         publishProgress(progress);
 126         switch (http.getResponseCode()) {
 127             case 200:
 128                 break;
 129             default:
 130                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 131         }
 132         // FIXME: why the resource block here? that would close the global DB connection
 133         try (SQLiteDatabase db = App.getDatabase()) {
 134             try (InputStream resp = http.getInputStream()) {
 135                 if (http.getResponseCode() != 200)
 136                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 137                 db.beginTransaction();
 138                 try {
 139                     prepareDbForRetrieval(db, profile);
 140
 141                     int matchedTransactionsCount = 0;
 142
 143
 144                     ParserState state = ParserState.EXPECTING_ACCOUNT;
 145                     String line;
 146                     BufferedReader buf =
 147                             new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 148
 149                     int processedTransactionCount = 0;
 150                     int transactionId = 0;
 151                     LedgerTransaction transaction = null;
 152                     LINES:
 153                     while ((line = buf.readLine()) != null) {
 154                         throwIfCancelled();
 155                         Matcher m;
 156                         m = reComment.matcher(line);
 157                         if (m.find()) {
 158                             // TODO: comments are ignored for now
 159 //                            Log.v("transaction-parser", "Ignoring comment");
 160                             continue;
 161                         }
 162                         //L(String.format("State is %d", updating));
 163                         switch (state) {
 164                             case EXPECTING_ACCOUNT:
 165                                 if (line.equals("<h2>General Journal</h2>")) {
 166                                     state = ParserState.EXPECTING_TRANSACTION;
 167                                     L("→ expecting transaction");
 168                                     // commit the current transaction and start a new one
 169                                     // the account list in the UI should reflect the (committed)
 170                                     // state of the database
 171                                     db.setTransactionSuccessful();
 172                                     db.endTransaction();
 173                                     Data.accounts.setList(accountList);
 174                                     db.beginTransaction();
 175                                     continue;
 176                                 }
 177                                 m = reAccountName.matcher(line);
 178                                 if (m.find()) {
 179                                     String acct_encoded = m.group(1);
 180                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 181                                     acct_name = acct_name.replace("\"", "");
 182                                     L(String.format("found account: %s", acct_name));
 183
 184                                     prevAccount = lastAccount;
 185                                     lastAccount = profile.tryLoadAccount(db, acct_name);
 186                                     if (lastAccount == null)
 187                                         lastAccount = new LedgerAccount(acct_name);
 188                                     else lastAccount.removeAmounts();
 189                                     profile.storeAccount(db, lastAccount);
 190
 191                                     if (prevAccount != null) prevAccount
 192                                             .setHasSubAccounts(prevAccount.isParentOf(lastAccount));
 193                                     // make sure the parent account(s) are present,
 194                                     // synthesising them if necessary
 195                                     // this happens when the (missing-in-HTML) parent account has
 196                                     // only one child so we create a synthetic parent account record,
 197                                     // copying the amounts when child's amounts are parsed
 198                                     String parentName = lastAccount.getParentName();
 199                                     if (parentName != null) {
 200                                         Stack<String> toAppend = new Stack<>();
 201                                         while (parentName != null) {
 202                                             if (accountNames.containsKey(parentName)) break;
 203                                             toAppend.push(parentName);
 204                                             parentName =
 205                                                     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,
 252                                             val);
 253                                     lastAccount.addAmount(val, currency);
 254                                     for (LedgerAccount syn : syntheticAccounts.values()) {
 255                                         syn.addAmount(val, currency);
 256                                         profile.storeAccountValue(db, syn.getName(), currency,
 257                                                 val);
 258                                     }
 259                                 }
 260
 261                                 if (match_found) {
 262                                     state = ParserState.EXPECTING_ACCOUNT;
 263                                     L("→ expecting account");
 264                                 }
 265
 266                                 break;
 267
 268                             case EXPECTING_TRANSACTION:
 269                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 270                                 m = reTransactionStart.matcher(line);
 271                                 if (m.find()) {
 272                                     transactionId = Integer.valueOf(m.group(1));
 273                                     state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 274                                     L(String.format(Locale.ENGLISH,
 275                                             "found transaction %d → expecting description",
 276                                             transactionId));
 277                                     progress.setProgress(++processedTransactionCount);
 278                                     if (maxTransactionId < transactionId)
 279                                         maxTransactionId = transactionId;
 280                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 281                                         (progress.getTotal() < transactionId))
 282                                         progress.setTotal(transactionId);
 283                                     publishProgress(progress);
 284                                 }
 285                                 m = reEnd.matcher(line);
 286                                 if (m.find()) {
 287                                     L("--- transaction value complete ---");
 288                                     break LINES;
 289                                 }
 290                                 break;
 291
 292                             case EXPECTING_TRANSACTION_DESCRIPTION:
 293                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 294                                 m = reTransactionDescription.matcher(line);
 295                                 if (m.find()) {
 296                                     if (transactionId == 0) throw new TransactionParserException(
 297                                             "Transaction Id is 0 while expecting " + "description");
 298
 299                                     String date = m.group(1);
 300                                     try {
 301                                         int equalsIndex = date.indexOf('=');
 302                                         if (equalsIndex >= 0)
 303                                             date = date.substring(equalsIndex + 1);
 304                                         transaction = new LedgerTransaction(transactionId, date,
 305                                                 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 ==
 326                                             MATCHING_TRANSACTIONS_LIMIT)
 327                                         {
 328                                             profile.markTransactionsBeforeTransactionAsPresent(db,
 329                                                     transaction);
 330                                             progress.setTotal(progress.getProgress());
 331                                             publishProgress(progress);
 332                                             break LINES;
 333                                         }
 334                                     }
 335                                     else {
 336                                         profile.storeTransaction(db, transaction);
 337                                         matchedTransactionsCount = 0;
 338                                         progress.setTotal(maxTransactionId);
 339                                     }
 340
 341                                     state = ParserState.EXPECTING_TRANSACTION;
 342                                     L(String.format("transaction %s saved → expecting transaction",
 343                                             transaction.getId()));
 344                                     transaction.finishLoading();
 345
 346 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 347 // for example, when you add the initial seeding transaction after entering some others
 348 //                                            if (transactionId == 1) {
 349 //                                                L("This was the initial transaction. Terminating " +
 350 //                                                  "parser");
 351 //                                                break LINES;
 352 //                                            }
 353                                 }
 354                                 else {
 355                                     m = reTransactionDetails.matcher(line);
 356                                     if (m.find()) {
 357                                         String acc_name = m.group(1);
 358                                         String amount = m.group(2);
 359                                         String currency = m.group(3);
 360                                         if (currency == null) currency = "";
 361                                         amount = amount.replace(',', '.');
 362                                         transaction.addAccount(
 363                                                 new LedgerTransactionAccount(acc_name,
 364                                                         Float.valueOf(amount), currency));
 365                                         L(String.format(Locale.ENGLISH, "%d: %s = %s",
 366                                                 transaction.getId(), acc_name, amount));
 367                                     }
 368                                     else throw new IllegalStateException(String.format(
 369                                             "Can't parse transaction %d " + "details: %s",
 370                                             transactionId, line));
 371                                 }
 372                                 break;
 373                             default:
 374                                 throw new RuntimeException(
 375                                         String.format("Unknown parser updating %s", state.name()));
 376                         }
 377                     }
 378
 379                     throwIfCancelled();
 380
 381                     profile.deleteNotPresentTransactions(db);
 382                     db.setTransactionSuccessful();
 383
 384                     profile.setLastUpdateStamp();
 385
 386                     return null;
 387                 }
 388                 finally {
 389                     db.endTransaction();
 390                 }
 391             }
 392         }
 393     }
 394     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 395         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 396                 new String[]{profile.getUuid()});
 397         db.execSQL("update account_values set keep=0 where profile=?;",
 398                 new String[]{profile.getUuid()});
 399         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 400     }
 401     private boolean retrieveAccountList()
 402             throws IOException, HTTPException {
 403         Progress progress = new Progress();
 404
 405         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 406         http.setAllowUserInteraction(false);
 407         switch (http.getResponseCode()) {
 408             case 200:
 409                 break;
 410             case 404:
 411                 return false;
 412             default:
 413                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 414         }
 415         publishProgress(progress);
 416         SQLiteDatabase db = App.getDatabase();
 417         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 418         boolean listFilledOK = false;
 419         try (InputStream resp = http.getInputStream()) {
 420             if (http.getResponseCode() != 200)
 421                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 422
 423             db.beginTransaction();
 424             try {
 425                 profile.markAccountsAsNotPresent(db);
 426
 427                 AccountListParser parser = new AccountListParser(resp);
 428
 429                 LedgerAccount prevAccount = null;
 430
 431                 while (true) {
 432                     throwIfCancelled();
 433                     ParsedLedgerAccount parsedAccount = parser.nextAccount();
 434                     if (parsedAccount == null) break;
 435
 436                     LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 437                     if (acc == null) acc = new LedgerAccount(parsedAccount.getAname());
 438                     else acc.removeAmounts();
 439
 440                     profile.storeAccount(db, acc);
 441                     String lastCurrency = null;
 442                     float lastCurrencyAmount = 0;
 443                     for (ParsedBalance b : parsedAccount.getAibalance()) {
 444                         final String currency = b.getAcommodity();
 445                         final float amount = b.getAquantity().asFloat();
 446                         if (currency.equals(lastCurrency)) lastCurrencyAmount += amount;
 447                         else {
 448                             if (lastCurrency != null) {
 449                                 profile.storeAccountValue(db, acc.getName(), lastCurrency,
 450                                         lastCurrencyAmount);
 451                                 acc.addAmount(lastCurrencyAmount, lastCurrency);
 452                             }
 453                             lastCurrency = currency;
 454                             lastCurrencyAmount = amount;
 455                         }
 456                     }
 457                     if (lastCurrency != null) {
 458                         profile.storeAccountValue(db, acc.getName(), lastCurrency,
 459                                 lastCurrencyAmount);
 460                         acc.addAmount(lastCurrencyAmount, lastCurrency);
 461                     }
 462
 463                     if (acc.isVisible(accountList)) accountList.add(acc);
 464
 465                     if (prevAccount != null) {
 466                         prevAccount.setHasSubAccounts(
 467                                 acc.getName().startsWith(prevAccount.getName() + ":"));
 468                     }
 469
 470                     prevAccount = acc;
 471                 }
 472                 throwIfCancelled();
 473
 474                 profile.deleteNotPresentAccounts(db);
 475                 throwIfCancelled();
 476                 db.setTransactionSuccessful();
 477                 listFilledOK = true;
 478             }
 479             finally {
 480                 db.endTransaction();
 481             }
 482         }
 483         // should not be set in the DB transaction, because of a possible deadlock
 484         // with the main and DbOpQueueRunner threads
 485         if (listFilledOK) Data.accounts.setList(accountList);
 486
 487         return true;
 488     }
 489     private boolean retrieveTransactionList()
 490             throws IOException, ParseException, HTTPException {
 491         Progress progress = new Progress();
 492         int maxTransactionId = Progress.INDETERMINATE;
 493
 494         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 495         http.setAllowUserInteraction(false);
 496         publishProgress(progress);
 497         switch (http.getResponseCode()) {
 498             case 200:
 499                 break;
 500             case 404:
 501                 return false;
 502             default:
 503                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 504         }
 505         SQLiteDatabase db = App.getDatabase();
 506         try (InputStream resp = http.getInputStream()) {
 507             if (http.getResponseCode() != 200)
 508                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 509             throwIfCancelled();
 510             db.beginTransaction();
 511             try {
 512                 profile.markTransactionsAsNotPresent(db);
 513
 514                 int matchedTransactionsCount = 0;
 515                 TransactionListParser parser = new TransactionListParser(resp);
 516
 517                 int processedTransactionCount = 0;
 518
 519                 DetectedTransactionOrder transactionOrder = DetectedTransactionOrder.UNKNOWN;
 520                 int orderAccumulator = 0;
 521                 int lastTransactionId = 0;
 522
 523                 while (true) {
 524                     throwIfCancelled();
 525                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 526                     throwIfCancelled();
 527                     if (parsedTransaction == null) break;
 528
 529                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 530                     if (transaction.getId() > lastTransactionId) orderAccumulator++;
 531                     else orderAccumulator--;
 532                     lastTransactionId = transaction.getId();
 533                     if (transactionOrder == DetectedTransactionOrder.UNKNOWN) {
 534                         if (orderAccumulator > 30) {
 535                             transactionOrder = DetectedTransactionOrder.FILE;
 536                             debug("rtt", String.format(Locale.ENGLISH,
 537                                     "Detected native file order after %d transactions (factor %d)",
 538                                     processedTransactionCount, orderAccumulator));
 539                             progress.setTotal(Data.transactions.size());
 540                         }
 541                         else if (orderAccumulator < -30) {
 542                             transactionOrder = DetectedTransactionOrder.REVERSE_CHRONOLOGICAL;
 543                             debug("rtt", String.format(Locale.ENGLISH,
 544                                     "Detected reverse chronological order after %d transactions (factor %d)",
 545                                     processedTransactionCount, orderAccumulator));
 546                         }
 547                     }
 548
 549                     if (transaction.existsInDb(db)) {
 550                         profile.markTransactionAsPresent(db, transaction);
 551                         matchedTransactionsCount++;
 552
 553                         if ((transactionOrder == DetectedTransactionOrder.REVERSE_CHRONOLOGICAL) &&
 554                             (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT))
 555                         {
 556                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 557                             progress.setTotal(progress.getProgress());
 558                             publishProgress(progress);
 559                             db.setTransactionSuccessful();
 560                             profile.setLastUpdateStamp();
 561                             return true;
 562                         }
 563                     }
 564                     else {
 565                         profile.storeTransaction(db, transaction);
 566                         matchedTransactionsCount = 0;
 567                         progress.setTotal(maxTransactionId);
 568                     }
 569
 570
 571                     if ((transactionOrder != DetectedTransactionOrder.UNKNOWN) &&
 572                         ((progress.getTotal() == Progress.INDETERMINATE) ||
 573                          (progress.getTotal() < transaction.getId())))
 574                         progress.setTotal(transaction.getId());
 575
 576                     progress.setProgress(++processedTransactionCount);
 577                     publishProgress(progress);
 578                 }
 579
 580                 throwIfCancelled();
 581                 profile.deleteNotPresentTransactions(db);
 582                 throwIfCancelled();
 583                 db.setTransactionSuccessful();
 584                 profile.setLastUpdateStamp();
 585             }
 586             finally {
 587                 db.endTransaction();
 588             }
 589         }
 590
 591         return true;
 592     }
 593
 594     @SuppressLint("DefaultLocale")
 595     @Override
 596     protected String doInBackground(Void... params) {
 597         Data.backgroundTaskStarted();
 598         try {
 599             if (!retrieveAccountList() || !retrieveTransactionList())
 600                 return retrieveTransactionListLegacy();
 601             return null;
 602         }
 603         catch (MalformedURLException e) {
 604             e.printStackTrace();
 605             return "Invalid server URL";
 606         }
 607         catch (HTTPException e) {
 608             e.printStackTrace();
 609             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 610         }
 611         catch (IOException e) {
 612             e.printStackTrace();
 613             return e.getLocalizedMessage();
 614         }
 615         catch (ParseException e) {
 616             e.printStackTrace();
 617             return "Network error";
 618         }
 619         catch (OperationCanceledException e) {
 620             e.printStackTrace();
 621             return "Operation cancelled";
 622         }
 623         finally {
 624             Data.backgroundTaskFinished();
 625         }
 626     }
 627     private MainActivity getContext() {
 628         return contextRef.get();
 629     }
 630     private void throwIfCancelled() {
 631         if (isCancelled()) throw new OperationCanceledException(null);
 632     }
 633     enum DetectedTransactionOrder {UNKNOWN, REVERSE_CHRONOLOGICAL, FILE}
 634
 635     private enum ParserState {
 636         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 637         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 638     }
 639
 640     public class Progress {
 641         public static final int INDETERMINATE = -1;
 642         private int progress;
 643         private int total;
 644         Progress() {
 645             this(INDETERMINATE, INDETERMINATE);
 646         }
 647         Progress(int progress, int total) {
 648             this.progress = progress;
 649             this.total = total;
 650         }
 651         public int getProgress() {
 652             return progress;
 653         }
 654         protected void setProgress(int progress) {
 655             this.progress = progress;
 656         }
 657         public int getTotal() {
 658             return total;
 659         }
 660         protected void setTotal(int total) {
 661             this.total = total;
 662         }
 663     }
 664
 665     private class TransactionParserException extends IllegalStateException {
 666         TransactionParserException(String message) {
 667             super(message);
 668         }
 669     }
 670 }