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