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.err.HTTPException;
  26 import net.ktnx.mobileledger.json.AccountListParser;
  27 import net.ktnx.mobileledger.json.ParsedBalance;
  28 import net.ktnx.mobileledger.json.ParsedLedgerAccount;
  29 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  30 import net.ktnx.mobileledger.json.TransactionListParser;
  31 import net.ktnx.mobileledger.model.Data;
  32 import net.ktnx.mobileledger.model.LedgerAccount;
  33 import net.ktnx.mobileledger.model.LedgerTransaction;
  34 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  35 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  36 import net.ktnx.mobileledger.ui.activity.MainActivity;
  37 import net.ktnx.mobileledger.utils.MLDB;
  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     private int error;
  73     // %3A is '='
  74     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  75     private Pattern reAccountValue = Pattern.compile(
  76             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  77     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef) {
  78         this.contextRef = contextRef;
  79     }
  80     private static void L(String msg) {
  81         //debug("transaction-parser", msg);
  82     }
  83     @Override
  84     protected void onProgressUpdate(Progress... values) {
  85         super.onProgressUpdate(values);
  86         MainActivity context = getContext();
  87         if (context == null) return;
  88         context.onRetrieveProgress(values[0]);
  89     }
  90     @Override
  91     protected void onPreExecute() {
  92         super.onPreExecute();
  93         MainActivity context = getContext();
  94         if (context == null) return;
  95         context.onRetrieveStart();
  96     }
  97     @Override
  98     protected void onPostExecute(String error) {
  99         super.onPostExecute(error);
 100         MainActivity context = getContext();
 101         if (context == null) return;
 102         context.onRetrieveDone(error);
 103     }
 104     @Override
 105     protected void onCancelled() {
 106         super.onCancelled();
 107         MainActivity context = getContext();
 108         if (context == null) return;
 109         context.onRetrieveDone(null);
 110     }
 111     private String retrieveTransactionListLegacy(MobileLedgerProfile profile)
 112             throws IOException, ParseException, HTTPException {
 113         Progress progress = new Progress();
 114         int maxTransactionId = Progress.INDETERMINATE;
 115         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 116         HashMap<String, Void> accountNames = new HashMap<>();
 117         HashMap<String, LedgerAccount> syntheticAccounts = new HashMap<>();
 118         LedgerAccount lastAccount = null, prevAccount = null;
 119         boolean onlyStarred = Data.optShowOnlyStarred.get();
 120
 121         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 122         http.setAllowUserInteraction(false);
 123         publishProgress(progress);
 124         switch (http.getResponseCode()) {
 125             case 200:
 126                 break;
 127             default:
 128                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 129         }
 130         try (SQLiteDatabase db = MLDB.getDatabase()) {
 131             try (InputStream resp = http.getInputStream()) {
 132                 if (http.getResponseCode() != 200)
 133                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 134                 db.beginTransaction();
 135                 try {
 136                     prepareDbForRetrieval(db, profile);
 137
 138                     int matchedTransactionsCount = 0;
 139
 140
 141                     ParserState state = ParserState.EXPECTING_ACCOUNT;
 142                     String line;
 143                     BufferedReader buf =
 144                             new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 145
 146                     int processedTransactionCount = 0;
 147                     int transactionId = 0;
 148                     LedgerTransaction transaction = null;
 149                     LINES:
 150                     while ((line = buf.readLine()) != null) {
 151                         throwIfCancelled();
 152                         Matcher m;
 153                         m = reComment.matcher(line);
 154                         if (m.find()) {
 155                             // TODO: comments are ignored for now
 156 //                            Log.v("transaction-parser", "Ignoring comment");
 157                             continue;
 158                         }
 159                         //L(String.format("State is %d", updating));
 160                         switch (state) {
 161                             case EXPECTING_ACCOUNT:
 162                                 if (line.equals("<h2>General Journal</h2>")) {
 163                                     state = ParserState.EXPECTING_TRANSACTION;
 164                                     L("→ expecting transaction");
 165                                     // commit the current transaction and start a new one
 166                                     // the account list in the UI should reflect the (committed)
 167                                     // state of the database
 168                                     db.setTransactionSuccessful();
 169                                     db.endTransaction();
 170                                     Data.accounts.setList(accountList);
 171                                     db.beginTransaction();
 172                                     continue;
 173                                 }
 174                                 m = reAccountName.matcher(line);
 175                                 if (m.find()) {
 176                                     String acct_encoded = m.group(1);
 177                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 178                                     acct_name = acct_name.replace("\"", "");
 179                                     L(String.format("found account: %s", acct_name));
 180
 181                                     prevAccount = lastAccount;
 182                                     lastAccount = profile.tryLoadAccount(db, acct_name);
 183                                     if (lastAccount == null)
 184                                         lastAccount = new LedgerAccount(acct_name);
 185                                     else lastAccount.removeAmounts();
 186                                     profile.storeAccount(db, lastAccount);
 187
 188                                     if (prevAccount != null) prevAccount
 189                                             .setHasSubAccounts(prevAccount.isParentOf(lastAccount));
 190                                     // make sure the parent account(s) are present,
 191                                     // synthesising them if necessary
 192                                     // this happens when the (missing-in-HTML) parent account has
 193                                     // only one child so we create a synthetic parent account record,
 194                                     // copying the amounts when child's amounts are parsed
 195                                     String parentName = lastAccount.getParentName();
 196                                     if (parentName != null) {
 197                                         Stack<String> toAppend = new Stack<>();
 198                                         while (parentName != null) {
 199                                             if (accountNames.containsKey(parentName)) break;
 200                                             toAppend.push(parentName);
 201                                             parentName =
 202                                                     new LedgerAccount(parentName).getParentName();
 203                                         }
 204                                         syntheticAccounts.clear();
 205                                         while (!toAppend.isEmpty()) {
 206                                             String aName = toAppend.pop();
 207                                             LedgerAccount acc = profile.tryLoadAccount(db, aName);
 208                                             if (acc == null) {
 209                                                 acc = new LedgerAccount(aName);
 210                                                 acc.setHiddenByStar(lastAccount.isHiddenByStar());
 211                                                 acc.setExpanded(!lastAccount.hasSubAccounts() ||
 212                                                                 lastAccount.isExpanded());
 213                                             }
 214                                             acc.setHasSubAccounts(true);
 215                                             acc.removeAmounts();    // filled below when amounts are parsed
 216                                             if ((!onlyStarred || !acc.isHiddenByStar()) &&
 217                                                 acc.isVisible(accountList)) accountList.add(acc);
 218                                             L(String.format("gap-filling with %s", aName));
 219                                             accountNames.put(aName, null);
 220                                             profile.storeAccount(db, acc);
 221                                             syntheticAccounts.put(aName, acc);
 222                                         }
 223                                     }
 224
 225                                     if ((!onlyStarred || !lastAccount.isHiddenByStar()) &&
 226                                         lastAccount.isVisible(accountList))
 227                                         accountList.add(lastAccount);
 228                                     accountNames.put(acct_name, null);
 229
 230                                     state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 231                                     L("→ expecting account amount");
 232                                 }
 233                                 break;
 234
 235                             case EXPECTING_ACCOUNT_AMOUNT:
 236                                 m = reAccountValue.matcher(line);
 237                                 boolean match_found = false;
 238                                 while (m.find()) {
 239                                     throwIfCancelled();
 240
 241                                     match_found = true;
 242                                     String value = m.group(1);
 243                                     String currency = m.group(2);
 244                                     if (currency == null) currency = "";
 245                                     value = value.replace(',', '.');
 246                                     L("curr=" + currency + ", value=" + value);
 247                                     final float val = Float.parseFloat(value);
 248                                     profile.storeAccountValue(db, lastAccount.getName(), currency,
 249                                             val);
 250                                     lastAccount.addAmount(val, currency);
 251                                     for (LedgerAccount syn : syntheticAccounts.values()) {
 252                                         syn.addAmount(val, currency);
 253                                         profile.storeAccountValue(db, syn.getName(), currency, val);
 254                                     }
 255                                 }
 256
 257                                 if (match_found) {
 258                                     state = ParserState.EXPECTING_ACCOUNT;
 259                                     L("→ expecting account");
 260                                 }
 261
 262                                 break;
 263
 264                             case EXPECTING_TRANSACTION:
 265                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 266                                 m = reTransactionStart.matcher(line);
 267                                 if (m.find()) {
 268                                     transactionId = Integer.valueOf(m.group(1));
 269                                     state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 270                                     L(String.format(Locale.ENGLISH,
 271                                             "found transaction %d → expecting description",
 272                                             transactionId));
 273                                     progress.setProgress(++processedTransactionCount);
 274                                     if (maxTransactionId < transactionId)
 275                                         maxTransactionId = transactionId;
 276                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 277                                         (progress.getTotal() < transactionId))
 278                                         progress.setTotal(transactionId);
 279                                     publishProgress(progress);
 280                                 }
 281                                 m = reEnd.matcher(line);
 282                                 if (m.find()) {
 283                                     L("--- transaction value complete ---");
 284                                     break LINES;
 285                                 }
 286                                 break;
 287
 288                             case EXPECTING_TRANSACTION_DESCRIPTION:
 289                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 290                                 m = reTransactionDescription.matcher(line);
 291                                 if (m.find()) {
 292                                     if (transactionId == 0) throw new TransactionParserException(
 293                                             "Transaction Id is 0 while expecting " + "description");
 294
 295                                     String date = m.group(1);
 296                                     try {
 297                                         int equalsIndex = date.indexOf('=');
 298                                         if (equalsIndex >= 0)
 299                                             date = date.substring(equalsIndex + 1);
 300                                         transaction = new LedgerTransaction(transactionId, date,
 301                                                 m.group(2));
 302                                     }
 303                                     catch (ParseException e) {
 304                                         e.printStackTrace();
 305                                         return String.format("Error parsing date '%s'", date);
 306                                     }
 307                                     state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 308                                     L(String.format(Locale.ENGLISH,
 309                                             "transaction %d created for %s (%s) →" +
 310                                             " expecting details", transactionId, date, m.group(2)));
 311                                 }
 312                                 break;
 313
 314                             case EXPECTING_TRANSACTION_DETAILS:
 315                                 if (line.isEmpty()) {
 316                                     // transaction data collected
 317                                     if (transaction.existsInDb(db)) {
 318                                         profile.markTransactionAsPresent(db, transaction);
 319                                         matchedTransactionsCount++;
 320
 321                                         if (matchedTransactionsCount ==
 322                                             MATCHING_TRANSACTIONS_LIMIT)
 323                                         {
 324                                             profile.markTransactionsBeforeTransactionAsPresent(db,
 325                                                     transaction);
 326                                             progress.setTotal(progress.getProgress());
 327                                             publishProgress(progress);
 328                                             break LINES;
 329                                         }
 330                                     }
 331                                     else {
 332                                         profile.storeTransaction(db, transaction);
 333                                         matchedTransactionsCount = 0;
 334                                         progress.setTotal(maxTransactionId);
 335                                     }
 336
 337                                     state = ParserState.EXPECTING_TRANSACTION;
 338                                     L(String.format("transaction %s saved → expecting transaction",
 339                                             transaction.getId()));
 340                                     transaction.finishLoading();
 341
 342 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 343 // for example, when you add the initial seeding transaction after entering some others
 344 //                                            if (transactionId == 1) {
 345 //                                                L("This was the initial transaction. Terminating " +
 346 //                                                  "parser");
 347 //                                                break LINES;
 348 //                                            }
 349                                 }
 350                                 else {
 351                                     m = reTransactionDetails.matcher(line);
 352                                     if (m.find()) {
 353                                         String acc_name = m.group(1);
 354                                         String amount = m.group(2);
 355                                         String currency = m.group(3);
 356                                         if (currency == null) currency = "";
 357                                         amount = amount.replace(',', '.');
 358                                         transaction.addAccount(
 359                                                 new LedgerTransactionAccount(acc_name,
 360                                                         Float.valueOf(amount), currency));
 361                                         L(String.format(Locale.ENGLISH, "%d: %s = %s",
 362                                                 transaction.getId(), acc_name, amount));
 363                                     }
 364                                     else throw new IllegalStateException(String.format(
 365                                             "Can't parse transaction %d " + "details: %s",
 366                                             transactionId, line));
 367                                 }
 368                                 break;
 369                             default:
 370                                 throw new RuntimeException(
 371                                         String.format("Unknown parser updating %s", state.name()));
 372                         }
 373                     }
 374
 375                     throwIfCancelled();
 376
 377                     profile.deleteNotPresentTransactions(db);
 378                     db.setTransactionSuccessful();
 379
 380                     profile.setLastUpdateStamp();
 381
 382                     return null;
 383                 }
 384                 finally {
 385                     db.endTransaction();
 386                 }
 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(MobileLedgerProfile profile)
 398             throws IOException, HTTPException {
 399         Progress progress = new Progress();
 400
 401         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 402         http.setAllowUserInteraction(false);
 403         switch (http.getResponseCode()) {
 404             case 200:
 405                 break;
 406             case 404:
 407                 return false;
 408             default:
 409                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 410         }
 411         publishProgress(progress);
 412         SQLiteDatabase db = MLDB.getDatabase();
 413         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 414         boolean listFilledOK = false;
 415         try (InputStream resp = http.getInputStream()) {
 416             if (http.getResponseCode() != 200)
 417                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 418
 419             db.beginTransaction();
 420             try {
 421                 profile.markAccountsAsNotPresent(db);
 422
 423                 AccountListParser parser = new AccountListParser(resp);
 424
 425                 LedgerAccount prevAccount = null;
 426
 427                 while (true) {
 428                     throwIfCancelled();
 429                     ParsedLedgerAccount parsedAccount = parser.nextAccount();
 430                     if (parsedAccount == null) break;
 431
 432                     LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 433                     if (acc == null) acc = new LedgerAccount(parsedAccount.getAname());
 434                     else acc.removeAmounts();
 435
 436                     profile.storeAccount(db, acc);
 437                     String lastCurrency = null;
 438                     float lastCurrencyAmount = 0;
 439                     for (ParsedBalance b : parsedAccount.getAibalance()) {
 440                         final String currency = b.getAcommodity();
 441                         final float amount = b.getAquantity().asFloat();
 442                         if (currency.equals(lastCurrency)) lastCurrencyAmount += amount;
 443                         else {
 444                             if (lastCurrency != null) {
 445                                 profile.storeAccountValue(db, acc.getName(), lastCurrency,
 446                                         lastCurrencyAmount);
 447                                 acc.addAmount(lastCurrencyAmount, lastCurrency);
 448                             }
 449                             lastCurrency = currency;
 450                             lastCurrencyAmount = amount;
 451                         }
 452                     }
 453                     if (lastCurrency != null) {
 454                         profile.storeAccountValue(db, acc.getName(), lastCurrency,
 455                                 lastCurrencyAmount);
 456                         acc.addAmount(lastCurrencyAmount, lastCurrency);
 457                     }
 458
 459                     if (acc.isVisible(accountList)) accountList.add(acc);
 460
 461                     if (prevAccount != null) {
 462                         prevAccount.setHasSubAccounts(
 463                                 acc.getName().startsWith(prevAccount.getName() + ":"));
 464                     }
 465
 466                     prevAccount = acc;
 467                 }
 468                 throwIfCancelled();
 469
 470                 profile.deleteNotPresentAccounts(db);
 471                 throwIfCancelled();
 472                 db.setTransactionSuccessful();
 473                 listFilledOK = true;
 474             }
 475             finally {
 476                 db.endTransaction();
 477             }
 478         }
 479         // should not be set in the DB transaction, because of a possible deadlock
 480         // with the main and DbOpQueueRunner threads
 481         if (listFilledOK) Data.accounts.setList(accountList);
 482
 483         return true;
 484     }
 485     private boolean retrieveTransactionList(MobileLedgerProfile profile)
 486             throws IOException, ParseException, HTTPException {
 487         Progress progress = new Progress();
 488         int maxTransactionId = Progress.INDETERMINATE;
 489
 490         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 491         http.setAllowUserInteraction(false);
 492         publishProgress(progress);
 493         switch (http.getResponseCode()) {
 494             case 200:
 495                 break;
 496             case 404:
 497                 return false;
 498             default:
 499                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 500         }
 501         SQLiteDatabase db = MLDB.getDatabase();
 502         try (InputStream resp = http.getInputStream()) {
 503             if (http.getResponseCode() != 200)
 504                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 505             throwIfCancelled();
 506             db.beginTransaction();
 507             try {
 508                 profile.markTransactionsAsNotPresent(db);
 509
 510                 int matchedTransactionsCount = 0;
 511                 TransactionListParser parser = new TransactionListParser(resp);
 512
 513                 int processedTransactionCount = 0;
 514
 515                 DetectedTransactionOrder transactionOrder = DetectedTransactionOrder.UNKNOWN;
 516                 int orderAccumulator = 0;
 517                 int lastTransactionId = 0;
 518
 519                 while (true) {
 520                     throwIfCancelled();
 521                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 522                     throwIfCancelled();
 523                     if (parsedTransaction == null) break;
 524
 525                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 526                     if (transaction.getId() > lastTransactionId) orderAccumulator++;
 527                     else orderAccumulator--;
 528                     lastTransactionId = transaction.getId();
 529                     if (transactionOrder == DetectedTransactionOrder.UNKNOWN) {
 530                         if (orderAccumulator > 30) {
 531                             transactionOrder = DetectedTransactionOrder.FILE;
 532                             debug("rtt", String.format(Locale.ENGLISH,
 533                                     "Detected native file order after %d transactions (factor %d)",
 534                                     processedTransactionCount, orderAccumulator));
 535                             progress.setTotal(Data.transactions.size());
 536                         }
 537                         else if (orderAccumulator < -30) {
 538                             transactionOrder = DetectedTransactionOrder.REVERSE_CHRONOLOGICAL;
 539                             debug("rtt", String.format(Locale.ENGLISH,
 540                                     "Detected reverse chronological order after %d transactions (factor %d)",
 541                                     processedTransactionCount, orderAccumulator));
 542                         }
 543                     }
 544
 545                     if (transaction.existsInDb(db)) {
 546                         profile.markTransactionAsPresent(db, transaction);
 547                         matchedTransactionsCount++;
 548
 549                         if ((transactionOrder == DetectedTransactionOrder.REVERSE_CHRONOLOGICAL) &&
 550                             (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT))
 551                         {
 552                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 553                             progress.setTotal(progress.getProgress());
 554                             publishProgress(progress);
 555                             db.setTransactionSuccessful();
 556                             profile.setLastUpdateStamp();
 557                             return true;
 558                         }
 559                     }
 560                     else {
 561                         profile.storeTransaction(db, transaction);
 562                         matchedTransactionsCount = 0;
 563                         progress.setTotal(maxTransactionId);
 564                     }
 565
 566
 567                     if ((transactionOrder != DetectedTransactionOrder.UNKNOWN) &&
 568                         ((progress.getTotal() == Progress.INDETERMINATE) ||
 569                          (progress.getTotal() < transaction.getId())))
 570                         progress.setTotal(transaction.getId());
 571
 572                     progress.setProgress(++processedTransactionCount);
 573                     publishProgress(progress);
 574                 }
 575
 576                 throwIfCancelled();
 577                 profile.deleteNotPresentTransactions(db);
 578                 throwIfCancelled();
 579                 db.setTransactionSuccessful();
 580                 profile.setLastUpdateStamp();
 581             }
 582             finally {
 583                 db.endTransaction();
 584             }
 585         }
 586
 587         return true;
 588     }
 589
 590     @SuppressLint("DefaultLocale")
 591     @Override
 592     protected String doInBackground(Void... params) {
 593         MobileLedgerProfile profile = Data.profile.get();
 594         Data.backgroundTaskStarted();
 595         try {
 596             if (!retrieveAccountList(profile) || !retrieveTransactionList(profile))
 597                 return retrieveTransactionListLegacy(profile);
 598             return null;
 599         }
 600         catch (MalformedURLException e) {
 601             e.printStackTrace();
 602             return "Invalid server URL";
 603         }
 604         catch (HTTPException e) {
 605             e.printStackTrace();
 606             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 607         }
 608         catch (IOException e) {
 609             e.printStackTrace();
 610             return e.getLocalizedMessage();
 611         }
 612         catch (ParseException e) {
 613             e.printStackTrace();
 614             return "Network error";
 615         }
 616         catch (OperationCanceledException e) {
 617             e.printStackTrace();
 618             return "Operation cancelled";
 619         }
 620         finally {
 621             Data.backgroundTaskFinished();
 622         }
 623     }
 624     private MainActivity getContext() {
 625         return contextRef.get();
 626     }
 627     private void throwIfCancelled() {
 628         if (isCancelled()) throw new OperationCanceledException(null);
 629     }
 630     enum DetectedTransactionOrder {UNKNOWN, REVERSE_CHRONOLOGICAL, FILE}
 631
 632     private enum ParserState {
 633         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 634         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 635     }
 636
 637     public class Progress {
 638         public static final int INDETERMINATE = -1;
 639         private int progress;
 640         private int total;
 641         Progress() {
 642             this(INDETERMINATE, INDETERMINATE);
 643         }
 644         Progress(int progress, int total) {
 645             this.progress = progress;
 646             this.total = total;
 647         }
 648         public int getProgress() {
 649             return progress;
 650         }
 651         protected void setProgress(int progress) {
 652             this.progress = progress;
 653         }
 654         public int getTotal() {
 655             return total;
 656         }
 657         protected void setTotal(int total) {
 658             this.total = total;
 659         }
 660     }
 661
 662     private class TransactionParserException extends IllegalStateException {
 663         TransactionParserException(String message) {
 664             super(message);
 665         }
 666     }
 667 }