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 import android.util.Log;
  25
  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.MLDB;
  39 import net.ktnx.mobileledger.utils.NetworkUtil;
  40
  41 import java.io.BufferedReader;
  42 import java.io.IOException;
  43 import java.io.InputStream;
  44 import java.io.InputStreamReader;
  45 import java.lang.ref.WeakReference;
  46 import java.net.HttpURLConnection;
  47 import java.net.MalformedURLException;
  48 import java.net.URLDecoder;
  49 import java.nio.charset.StandardCharsets;
  50 import java.text.ParseException;
  51 import java.util.ArrayList;
  52 import java.util.HashMap;
  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("found transaction %d → expecting description",
 271                                             transactionId));
 272                                     progress.setProgress(++processedTransactionCount);
 273                                     if (maxTransactionId < transactionId)
 274                                         maxTransactionId = transactionId;
 275                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 276                                         (progress.getTotal() < transactionId))
 277                                         progress.setTotal(transactionId);
 278                                     publishProgress(progress);
 279                                 }
 280                                 m = reEnd.matcher(line);
 281                                 if (m.find()) {
 282                                     L("--- transaction value complete ---");
 283                                     break LINES;
 284                                 }
 285                                 break;
 286
 287                             case EXPECTING_TRANSACTION_DESCRIPTION:
 288                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 289                                 m = reTransactionDescription.matcher(line);
 290                                 if (m.find()) {
 291                                     if (transactionId == 0) throw new TransactionParserException(
 292                                             "Transaction Id is 0 while expecting " + "description");
 293
 294                                     String date = m.group(1);
 295                                     try {
 296                                         int equalsIndex = date.indexOf('=');
 297                                         if (equalsIndex >= 0)
 298                                             date = date.substring(equalsIndex + 1);
 299                                         transaction = new LedgerTransaction(transactionId, date,
 300                                                 m.group(2));
 301                                     }
 302                                     catch (ParseException e) {
 303                                         e.printStackTrace();
 304                                         return String.format("Error parsing date '%s'", date);
 305                                     }
 306                                     state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 307                                     L(String.format("transaction %d created for %s (%s) →" +
 308                                                     " expecting details", transactionId, date,
 309                                             m.group(2)));
 310                                 }
 311                                 break;
 312
 313                             case EXPECTING_TRANSACTION_DETAILS:
 314                                 if (line.isEmpty()) {
 315                                     // transaction data collected
 316                                     if (transaction.existsInDb(db)) {
 317                                         profile.markTransactionAsPresent(db, transaction);
 318                                         matchedTransactionsCount++;
 319
 320                                         if (matchedTransactionsCount ==
 321                                             MATCHING_TRANSACTIONS_LIMIT)
 322                                         {
 323                                             profile.markTransactionsBeforeTransactionAsPresent(db,
 324                                                     transaction);
 325                                             progress.setTotal(progress.getProgress());
 326                                             publishProgress(progress);
 327                                             break LINES;
 328                                         }
 329                                     }
 330                                     else {
 331                                         profile.storeTransaction(db, transaction);
 332                                         matchedTransactionsCount = 0;
 333                                         progress.setTotal(maxTransactionId);
 334                                     }
 335
 336                                     state = ParserState.EXPECTING_TRANSACTION;
 337                                     L(String.format("transaction %s saved → expecting transaction",
 338                                             transaction.getId()));
 339                                     transaction.finishLoading();
 340
 341 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 342 // for example, when you add the initial seeding transaction after entering some others
 343 //                                            if (transactionId == 1) {
 344 //                                                L("This was the initial transaction. Terminating " +
 345 //                                                  "parser");
 346 //                                                break LINES;
 347 //                                            }
 348                                 }
 349                                 else {
 350                                     m = reTransactionDetails.matcher(line);
 351                                     if (m.find()) {
 352                                         String acc_name = m.group(1);
 353                                         String amount = m.group(2);
 354                                         String currency = m.group(3);
 355                                         if (currency == null) currency = "";
 356                                         amount = amount.replace(',', '.');
 357                                         transaction.addAccount(
 358                                                 new LedgerTransactionAccount(acc_name,
 359                                                         Float.valueOf(amount), currency));
 360                                         L(String.format("%d: %s = %s", transaction.getId(),
 361                                                 acc_name, amount));
 362                                     }
 363                                     else throw new IllegalStateException(String.format(
 364                                             "Can't parse transaction %d " + "details: %s",
 365                                             transactionId, line));
 366                                 }
 367                                 break;
 368                             default:
 369                                 throw new RuntimeException(
 370                                         String.format("Unknown parser updating %s", state.name()));
 371                         }
 372                     }
 373
 374                     throwIfCancelled();
 375
 376                     profile.deleteNotPresentTransactions(db);
 377                     db.setTransactionSuccessful();
 378
 379                     profile.setLastUpdateStamp();
 380
 381                     return null;
 382                 }
 383                 finally {
 384                     db.endTransaction();
 385                 }
 386             }
 387         }
 388     }
 389     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 390         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 391                 new String[]{profile.getUuid()});
 392         db.execSQL("update account_values set keep=0 where profile=?;",
 393                 new String[]{profile.getUuid()});
 394         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 395     }
 396     private boolean retrieveAccountList(MobileLedgerProfile profile)
 397             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 = MLDB.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(MobileLedgerProfile profile)
 485             throws IOException, ParseException, HTTPException {
 486         Progress progress = new Progress();
 487         int maxTransactionId = Progress.INDETERMINATE;
 488
 489         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 490         http.setAllowUserInteraction(false);
 491         publishProgress(progress);
 492         switch (http.getResponseCode()) {
 493             case 200:
 494                 break;
 495             case 404:
 496                 return false;
 497             default:
 498                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 499         }
 500         SQLiteDatabase db = MLDB.getDatabase();
 501         try (InputStream resp = http.getInputStream()) {
 502             if (http.getResponseCode() != 200)
 503                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 504             throwIfCancelled();
 505             db.beginTransaction();
 506             try {
 507                 profile.markTransactionsAsNotPresent(db);
 508
 509                 int matchedTransactionsCount = 0;
 510                 TransactionListParser parser = new TransactionListParser(resp);
 511
 512                 int processedTransactionCount = 0;
 513
 514                 DetectedTransactionOrder transactionOrder = DetectedTransactionOrder.UNKNOWN;
 515                 int orderAccumulator = 0;
 516                 int lastTransactionId = 0;
 517
 518                 while (true) {
 519                     throwIfCancelled();
 520                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 521                     throwIfCancelled();
 522                     if (parsedTransaction == null) break;
 523
 524                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 525                     if (transaction.getId() > lastTransactionId) orderAccumulator++;
 526                     else orderAccumulator--;
 527                     lastTransactionId = transaction.getId();
 528                     if (transactionOrder == DetectedTransactionOrder.UNKNOWN) {
 529                         if (orderAccumulator > 30) {
 530                             transactionOrder = DetectedTransactionOrder.FILE;
 531                             debug("rtt", String.format(
 532                                     "Detected native file order after %d transactions (factor %d)",
 533                                     processedTransactionCount, orderAccumulator));
 534                             progress.setTotal(Data.transactions.size());
 535                         }
 536                         else if (orderAccumulator < -30) {
 537                             transactionOrder = DetectedTransactionOrder.REVERSE_CHRONOLOGICAL;
 538                             debug("rtt", String.format(
 539                                     "Detected reverse chronological order after %d transactions (factor %d)",
 540                                     processedTransactionCount, orderAccumulator));
 541                         }
 542                     }
 543
 544                     if (transaction.existsInDb(db)) {
 545                         profile.markTransactionAsPresent(db, transaction);
 546                         matchedTransactionsCount++;
 547
 548                         if ((transactionOrder == DetectedTransactionOrder.REVERSE_CHRONOLOGICAL) &&
 549                             (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT))
 550                         {
 551                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 552                             progress.setTotal(progress.getProgress());
 553                             publishProgress(progress);
 554                             db.setTransactionSuccessful();
 555                             profile.setLastUpdateStamp();
 556                             return true;
 557                         }
 558                     }
 559                     else {
 560                         profile.storeTransaction(db, transaction);
 561                         matchedTransactionsCount = 0;
 562                         progress.setTotal(maxTransactionId);
 563                     }
 564
 565
 566                     if ((transactionOrder != DetectedTransactionOrder.UNKNOWN) &&
 567                         ((progress.getTotal() == Progress.INDETERMINATE) ||
 568                          (progress.getTotal() < transaction.getId())))
 569                         progress.setTotal(transaction.getId());
 570
 571                     progress.setProgress(++processedTransactionCount);
 572                     publishProgress(progress);
 573                 }
 574
 575                 throwIfCancelled();
 576                 profile.deleteNotPresentTransactions(db);
 577                 throwIfCancelled();
 578                 db.setTransactionSuccessful();
 579                 profile.setLastUpdateStamp();
 580             }
 581             finally {
 582                 db.endTransaction();
 583             }
 584         }
 585
 586         return true;
 587     }
 588
 589     @SuppressLint("DefaultLocale")
 590     @Override
 591     protected String doInBackground(Void... params) {
 592         MobileLedgerProfile profile = Data.profile.get();
 593         Data.backgroundTaskStarted();
 594         try {
 595             if (!retrieveAccountList(profile) || !retrieveTransactionList(profile))
 596                 return retrieveTransactionListLegacy(profile);
 597             return null;
 598         }
 599         catch (MalformedURLException e) {
 600             e.printStackTrace();
 601             return "Invalid server URL";
 602         }
 603         catch (HTTPException e) {
 604             e.printStackTrace();
 605             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 606         }
 607         catch (IOException e) {
 608             e.printStackTrace();
 609             return e.getLocalizedMessage();
 610         }
 611         catch (ParseException e) {
 612             e.printStackTrace();
 613             return "Network error";
 614         }
 615         catch (OperationCanceledException e) {
 616             e.printStackTrace();
 617             return "Operation cancelled";
 618         }
 619         finally {
 620             Data.backgroundTaskFinished();
 621         }
 622     }
 623     private MainActivity getContext() {
 624         return contextRef.get();
 625     }
 626     private void throwIfCancelled() {
 627         if (isCancelled()) throw new OperationCanceledException(null);
 628     }
 629     enum DetectedTransactionOrder {UNKNOWN, REVERSE_CHRONOLOGICAL, FILE}
 630
 631     private enum ParserState {
 632         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 633         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 634     }
 635
 636     public class Progress {
 637         public static final int INDETERMINATE = -1;
 638         private int progress;
 639         private int total;
 640         Progress() {
 641             this(INDETERMINATE, INDETERMINATE);
 642         }
 643         Progress(int progress, int total) {
 644             this.progress = progress;
 645             this.total = total;
 646         }
 647         public int getProgress() {
 648             return progress;
 649         }
 650         protected void setProgress(int progress) {
 651             this.progress = progress;
 652         }
 653         public int getTotal() {
 654             return total;
 655         }
 656         protected void setTotal(int total) {
 657             this.total = total;
 658         }
 659     }
 660
 661     private class TransactionParserException extends IllegalStateException {
 662         TransactionParserException(String message) {
 663             super(message);
 664         }
 665     }
 666 }