app/src/main/java/net/ktnx/mobileledger/async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2021 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 androidx.annotation.NonNull;
  26
  27 import com.fasterxml.jackson.databind.RuntimeJsonMappingException;
  28
  29 import net.ktnx.mobileledger.App;
  30 import net.ktnx.mobileledger.err.HTTPException;
  31 import net.ktnx.mobileledger.json.API;
  32 import net.ktnx.mobileledger.json.AccountListParser;
  33 import net.ktnx.mobileledger.json.ApiNotSupportedException;
  34 import net.ktnx.mobileledger.json.TransactionListParser;
  35 import net.ktnx.mobileledger.model.Data;
  36 import net.ktnx.mobileledger.model.LedgerAccount;
  37 import net.ktnx.mobileledger.model.LedgerTransaction;
  38 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  39 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  40 import net.ktnx.mobileledger.ui.MainModel;
  41 import net.ktnx.mobileledger.utils.Logger;
  42 import net.ktnx.mobileledger.utils.NetworkUtil;
  43
  44 import java.io.BufferedReader;
  45 import java.io.IOException;
  46 import java.io.InputStream;
  47 import java.io.InputStreamReader;
  48 import java.net.HttpURLConnection;
  49 import java.net.MalformedURLException;
  50 import java.net.URLDecoder;
  51 import java.nio.charset.StandardCharsets;
  52 import java.text.ParseException;
  53 import java.util.ArrayList;
  54 import java.util.Collections;
  55 import java.util.HashMap;
  56 import java.util.List;
  57 import java.util.Locale;
  58 import java.util.Objects;
  59 import java.util.regex.Matcher;
  60 import java.util.regex.Pattern;
  61
  62
  63 public class RetrieveTransactionsTask extends
  64         AsyncTask<Void, RetrieveTransactionsTask.Progress, RetrieveTransactionsTask.Result> {
  65     private static final int MATCHING_TRANSACTIONS_LIMIT = 150;
  66     private static final Pattern reComment = Pattern.compile("^\\s*;");
  67     private static final Pattern reTransactionStart = Pattern.compile(
  68             "<tr class=\"title\" " + "id=\"transaction-(\\d+)" + "\"><td class=\"date" +
  69             "\"[^\"]*>([\\d.-]+)</td>");
  70     private static final Pattern reTransactionDescription =
  71             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  72     private static final Pattern reTransactionDetails = Pattern.compile(
  73             "^\\s+" + "([!*]\\s+)?" + "(\\S[\\S\\s]+\\S)\\s\\s+" + "(?:([^\\d\\s+\\-]+)\\s*)?" +
  74             "([-+]?\\d[\\d,.]*)" + "(?:\\s*([^\\d\\s+\\-]+)\\s*$)?");
  75     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  76     private static final Pattern reDecimalPoint = Pattern.compile("\\.\\d\\d?$");
  77     private static final Pattern reDecimalComma = Pattern.compile(",\\d\\d?$");
  78     // %3A is '='
  79     private final Pattern reAccountName =
  80             Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  81     private final Pattern reAccountValue = Pattern.compile(
  82             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  83     private final MainModel mainModel;
  84     private final MobileLedgerProfile profile;
  85     private final List<LedgerAccount> prevAccounts;
  86     private int expectedPostingsCount = -1;
  87     public RetrieveTransactionsTask(@NonNull MainModel mainModel,
  88                                     @NonNull MobileLedgerProfile profile,
  89                                     List<LedgerAccount> accounts) {
  90         this.mainModel = mainModel;
  91         this.profile = profile;
  92         this.prevAccounts = accounts;
  93     }
  94     private static void L(String msg) {
  95         //debug("transaction-parser", msg);
  96     }
  97     static LedgerTransactionAccount parseTransactionAccountLine(String line) {
  98         Matcher m = reTransactionDetails.matcher(line);
  99         if (m.find()) {
 100             String postingStatus = m.group(1);
 101             String acc_name = m.group(2);
 102             String currencyPre = m.group(3);
 103             String amount = Objects.requireNonNull(m.group(4));
 104             String currencyPost = m.group(5);
 105
 106             String currency = null;
 107             if ((currencyPre != null) && (currencyPre.length() > 0)) {
 108                 if ((currencyPost != null) && (currencyPost.length() > 0))
 109                     return null;
 110                 currency = currencyPre;
 111             }
 112             else if ((currencyPost != null) && (currencyPost.length() > 0)) {
 113                 currency = currencyPost;
 114             }
 115
 116             amount = amount.replace(',', '.');
 117
 118             return new LedgerTransactionAccount(acc_name, Float.parseFloat(amount), currency, null);
 119         }
 120         else {
 121             return null;
 122         }
 123     }
 124     @Override
 125     protected void onProgressUpdate(Progress... values) {
 126         super.onProgressUpdate(values);
 127         Data.backgroundTaskProgress.postValue(values[0]);
 128     }
 129     @Override
 130     protected void onPostExecute(Result result) {
 131         super.onPostExecute(result);
 132         Progress progress = new Progress();
 133         progress.setState(ProgressState.FINISHED);
 134         progress.setError(result.error);
 135         onProgressUpdate(progress);
 136     }
 137     @Override
 138     protected void onCancelled() {
 139         super.onCancelled();
 140         Progress progress = new Progress();
 141         progress.setState(ProgressState.FINISHED);
 142         onProgressUpdate(progress);
 143     }
 144     private void retrieveTransactionListLegacy(List<LedgerAccount> accounts,
 145                                                List<LedgerTransaction> transactions)
 146             throws IOException, HTTPException {
 147         Progress progress = Progress.indeterminate();
 148         progress.setState(ProgressState.RUNNING);
 149         progress.setTotal(expectedPostingsCount);
 150         int maxTransactionId = -1;
 151         HashMap<String, LedgerAccount> map = new HashMap<>();
 152         LedgerAccount lastAccount = null;
 153         ArrayList<LedgerAccount> syntheticAccounts = new ArrayList<>();
 154
 155         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 156         http.setAllowUserInteraction(false);
 157         publishProgress(progress);
 158         if (http.getResponseCode() != 200)
 159             throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 160
 161         try (InputStream resp = http.getInputStream()) {
 162             if (http.getResponseCode() != 200)
 163                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 164
 165             int matchedTransactionsCount = 0;
 166
 167             ParserState state = ParserState.EXPECTING_ACCOUNT;
 168             String line;
 169             BufferedReader buf =
 170                     new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 171
 172             int processedTransactionCount = 0;
 173             int transactionId = 0;
 174             LedgerTransaction transaction = null;
 175             LINES:
 176             while ((line = buf.readLine()) != null) {
 177                 throwIfCancelled();
 178                 Matcher m;
 179                 m = reComment.matcher(line);
 180                 if (m.find()) {
 181                     // TODO: comments are ignored for now
 182 //                            Log.v("transaction-parser", "Ignoring comment");
 183                     continue;
 184                 }
 185                 //L(String.format("State is %d", updating));
 186                 switch (state) {
 187                     case EXPECTING_ACCOUNT:
 188                         if (line.equals("<h2>General Journal</h2>")) {
 189                             state = ParserState.EXPECTING_TRANSACTION;
 190                             L("→ expecting transaction");
 191                             continue;
 192                         }
 193                         m = reAccountName.matcher(line);
 194                         if (m.find()) {
 195                             String acct_encoded = m.group(1);
 196                             String accName = URLDecoder.decode(acct_encoded, "UTF-8");
 197                             accName = accName.replace("\"", "");
 198                             L(String.format("found account: %s", accName));
 199
 200                             lastAccount = map.get(accName);
 201                             if (lastAccount != null) {
 202                                 L(String.format("ignoring duplicate account '%s'", accName));
 203                                 continue;
 204                             }
 205                             String parentAccountName = LedgerAccount.extractParentName(accName);
 206                             LedgerAccount parentAccount;
 207                             if (parentAccountName != null) {
 208                                 parentAccount = ensureAccountExists(parentAccountName, map,
 209                                         syntheticAccounts);
 210                             }
 211                             else {
 212                                 parentAccount = null;
 213                             }
 214                             lastAccount = new LedgerAccount(accName, parentAccount);
 215
 216                             accounts.add(lastAccount);
 217                             map.put(accName, lastAccount);
 218
 219                             state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 220                             L("→ expecting account amount");
 221                         }
 222                         break;
 223
 224                     case EXPECTING_ACCOUNT_AMOUNT:
 225                         m = reAccountValue.matcher(line);
 226                         boolean match_found = false;
 227                         while (m.find()) {
 228                             throwIfCancelled();
 229
 230                             match_found = true;
 231                             String value = Objects.requireNonNull(m.group(1));
 232                             String currency = m.group(2);
 233                             if (currency == null)
 234                                 currency = "";
 235
 236                             {
 237                                 Matcher tmpM = reDecimalComma.matcher(value);
 238                                 if (tmpM.find()) {
 239                                     value = value.replace(".", "");
 240                                     value = value.replace(',', '.');
 241                                 }
 242
 243                                 tmpM = reDecimalPoint.matcher(value);
 244                                 if (tmpM.find()) {
 245                                     value = value.replace(",", "");
 246                                     value = value.replace(" ", "");
 247                                 }
 248                             }
 249                             L("curr=" + currency + ", value=" + value);
 250                             final float val = Float.parseFloat(value);
 251                             lastAccount.addAmount(val, currency);
 252                             for (LedgerAccount syn : syntheticAccounts) {
 253                                 L(String.format(Locale.ENGLISH, "propagating %s %1.2f to %s",
 254                                         currency, val, syn.getName()));
 255                                 syn.addAmount(val, currency);
 256                             }
 257                         }
 258
 259                         if (match_found) {
 260                             syntheticAccounts.clear();
 261                             state = ParserState.EXPECTING_ACCOUNT;
 262                             L("→ expecting account");
 263                         }
 264
 265                         break;
 266
 267                     case EXPECTING_TRANSACTION:
 268                         if (!line.isEmpty() && (line.charAt(0) == ' '))
 269                             continue;
 270                         m = reTransactionStart.matcher(line);
 271                         if (m.find()) {
 272                             transactionId = Integer.parseInt(Objects.requireNonNull(m.group(1)));
 273                             state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 274                             L(String.format(Locale.ENGLISH,
 275                                     "found transaction %d → expecting description", transactionId));
 276                             progress.setProgress(++processedTransactionCount);
 277                             if (maxTransactionId < transactionId)
 278                                 maxTransactionId = transactionId;
 279                             if ((progress.isIndeterminate()) ||
 280                                 (progress.getTotal() < transactionId))
 281                                 progress.setTotal(transactionId);
 282                             publishProgress(progress);
 283                         }
 284                         m = reEnd.matcher(line);
 285                         if (m.find()) {
 286                             L("--- transaction value complete ---");
 287                             break LINES;
 288                         }
 289                         break;
 290
 291                     case EXPECTING_TRANSACTION_DESCRIPTION:
 292                         if (!line.isEmpty() && (line.charAt(0) == ' '))
 293                             continue;
 294                         m = reTransactionDescription.matcher(line);
 295                         if (m.find()) {
 296                             if (transactionId == 0)
 297                                 throw new TransactionParserException(
 298                                         "Transaction Id is 0 while expecting description");
 299
 300                             String date = Objects.requireNonNull(m.group(1));
 301                             try {
 302                                 int equalsIndex = date.indexOf('=');
 303                                 if (equalsIndex >= 0)
 304                                     date = date.substring(equalsIndex + 1);
 305                                 transaction =
 306                                         new LedgerTransaction(transactionId, date, m.group(2));
 307                             }
 308                             catch (ParseException e) {
 309                                 throw new TransactionParserException(
 310                                         String.format("Error parsing date '%s'", date));
 311                             }
 312                             state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 313                             L(String.format(Locale.ENGLISH,
 314                                     "transaction %d created for %s (%s) →" + " expecting details",
 315                                     transactionId, date, m.group(2)));
 316                         }
 317                         break;
 318
 319                     case EXPECTING_TRANSACTION_DETAILS:
 320                         if (line.isEmpty()) {
 321                             // transaction data collected
 322
 323                             transaction.finishLoading();
 324                             transactions.add(transaction);
 325
 326                             state = ParserState.EXPECTING_TRANSACTION;
 327                             L(String.format("transaction %s parsed → expecting transaction",
 328                                     transaction.getId()));
 329
 330 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 331 // for example, when you add the initial seeding transaction after entering some others
 332 //                                            if (transactionId == 1) {
 333 //                                                L("This was the initial transaction.
 334 //                                                Terminating " +
 335 //                                                  "parser");
 336 //                                                break LINES;
 337 //                                            }
 338                         }
 339                         else {
 340                             LedgerTransactionAccount lta = parseTransactionAccountLine(line);
 341                             if (lta != null) {
 342                                 transaction.addAccount(lta);
 343                                 L(String.format(Locale.ENGLISH, "%d: %s = %s", transaction.getId(),
 344                                         lta.getAccountName(), lta.getAmount()));
 345                             }
 346                             else
 347                                 throw new IllegalStateException(
 348                                         String.format("Can't parse transaction %d details: %s",
 349                                                 transactionId, line));
 350                         }
 351                         break;
 352                     default:
 353                         throw new RuntimeException(
 354                                 String.format("Unknown parser updating %s", state.name()));
 355                 }
 356             }
 357
 358             throwIfCancelled();
 359         }
 360     }
 361     @NonNull
 362     public LedgerAccount ensureAccountExists(String accountName, HashMap<String, LedgerAccount> map,
 363                                              ArrayList<LedgerAccount> createdAccounts) {
 364         LedgerAccount acc = map.get(accountName);
 365
 366         if (acc != null)
 367             return acc;
 368
 369         String parentName = LedgerAccount.extractParentName(accountName);
 370         LedgerAccount parentAccount;
 371         if (parentName != null) {
 372             parentAccount = ensureAccountExists(parentName, map, createdAccounts);
 373         }
 374         else {
 375             parentAccount = null;
 376         }
 377
 378         acc = new LedgerAccount(accountName, parentAccount);
 379         createdAccounts.add(acc);
 380         return acc;
 381     }
 382     public void addNumberOfPostings(int number) {
 383         expectedPostingsCount += number;
 384     }
 385     private List<LedgerAccount> retrieveAccountList()
 386             throws IOException, HTTPException, ApiNotSupportedException {
 387         final API apiVersion = profile.getApiVersion();
 388         if (apiVersion.equals(API.auto)) {
 389             return retrieveAccountListAnyVersion();
 390         }
 391         else if (apiVersion.equals(API.html)) {
 392             Logger.debug("json",
 393                     "Declining using JSON API for /accounts with configured legacy API version");
 394             return null;
 395         }
 396         else {
 397             return retrieveAccountListForVersion(apiVersion);
 398         }
 399     }
 400     private List<LedgerAccount> retrieveAccountListAnyVersion()
 401             throws HTTPException, ApiNotSupportedException {
 402         for (API ver : API.allVersions) {
 403             try {
 404                 return retrieveAccountListForVersion(ver);
 405             }
 406             catch (Exception e) {
 407                 Logger.debug("json",
 408                         String.format(Locale.US, "Error during account list retrieval using API %s",
 409                                 ver.getDescription()));
 410             }
 411
 412             throw new ApiNotSupportedException();
 413         }
 414
 415         throw new RuntimeException("This should never be reached");
 416     }
 417     private List<LedgerAccount> retrieveAccountListForVersion(API version)
 418             throws IOException, HTTPException {
 419         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 420         http.setAllowUserInteraction(false);
 421         switch (http.getResponseCode()) {
 422             case 200:
 423                 break;
 424             case 404:
 425                 return null;
 426             default:
 427                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 428         }
 429         publishProgress(Progress.indeterminate());
 430         SQLiteDatabase db = App.getDatabase();
 431         ArrayList<LedgerAccount> list = new ArrayList<>();
 432         HashMap<String, LedgerAccount> map = new HashMap<>();
 433         HashMap<String, LedgerAccount> currentMap = new HashMap<>();
 434         for (LedgerAccount acc : prevAccounts)
 435             currentMap.put(acc.getName(), acc);
 436         throwIfCancelled();
 437         try (InputStream resp = http.getInputStream()) {
 438             throwIfCancelled();
 439             if (http.getResponseCode() != 200)
 440                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 441
 442             AccountListParser parser = AccountListParser.forApiVersion(version, resp);
 443             expectedPostingsCount = 0;
 444
 445             while (true) {
 446                 throwIfCancelled();
 447                 LedgerAccount acc = parser.nextAccount(this, map);
 448                 if (acc == null)
 449                     break;
 450                 list.add(acc);
 451             }
 452             throwIfCancelled();
 453         }
 454
 455         // the current account tree may have changed, update the new-to be tree to match
 456         for (LedgerAccount acc : list) {
 457             LedgerAccount prevData = currentMap.get(acc.getName());
 458             if (prevData != null) {
 459                 acc.setExpanded(prevData.isExpanded());
 460                 acc.setAmountsExpanded(prevData.amountsExpanded());
 461             }
 462         }
 463
 464         return list;
 465     }
 466     private List<LedgerTransaction> retrieveTransactionList()
 467             throws ParseException, HTTPException, IOException, ApiNotSupportedException {
 468         final API apiVersion = profile.getApiVersion();
 469         if (apiVersion.equals(API.auto)) {
 470             return retrieveTransactionListAnyVersion();
 471         }
 472         else if (apiVersion.equals(API.html)) {
 473             Logger.debug("json",
 474                     "Declining using JSON API for /accounts with configured legacy API version");
 475             return null;
 476         }
 477         else {
 478             return retrieveTransactionListForVersion(apiVersion);
 479         }
 480
 481     }
 482     private List<LedgerTransaction> retrieveTransactionListAnyVersion()
 483             throws ApiNotSupportedException {
 484         for (API ver : API.allVersions) {
 485             try {
 486                 return retrieveTransactionListForVersion(ver);
 487             }
 488             catch (Exception | HTTPException e) {
 489                 Logger.debug("json",
 490                         String.format(Locale.US, "Error during account list retrieval using API %s",
 491                                 ver.getDescription()));
 492             }
 493
 494             throw new ApiNotSupportedException();
 495         }
 496
 497         throw new RuntimeException("This should never be reached");
 498     }
 499     private List<LedgerTransaction> retrieveTransactionListForVersion(API apiVersion)
 500             throws IOException, ParseException, HTTPException {
 501         Progress progress = new Progress();
 502         progress.setTotal(expectedPostingsCount);
 503
 504         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 505         http.setAllowUserInteraction(false);
 506         publishProgress(progress);
 507         switch (http.getResponseCode()) {
 508             case 200:
 509                 break;
 510             case 404:
 511                 return null;
 512             default:
 513                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 514         }
 515         ArrayList<LedgerTransaction> trList = new ArrayList<>();
 516         try (InputStream resp = http.getInputStream()) {
 517             throwIfCancelled();
 518
 519             TransactionListParser parser = TransactionListParser.forApiVersion(apiVersion, resp);
 520
 521             int processedPostings = 0;
 522
 523             while (true) {
 524                 throwIfCancelled();
 525                 LedgerTransaction transaction = parser.nextTransaction();
 526                 throwIfCancelled();
 527                 if (transaction == null)
 528                     break;
 529
 530                 trList.add(transaction);
 531
 532                 progress.setProgress(processedPostings += transaction.getAccounts()
 533                                                                      .size());
 534 //                Logger.debug("trParser",
 535 //                        String.format(Locale.US, "Parsed transaction %d - %s", transaction
 536 //                        .getId(),
 537 //                                transaction.getDescription()));
 538 //                for (LedgerTransactionAccount acc : transaction.getAccounts()) {
 539 //                    Logger.debug("trParser",
 540 //                            String.format(Locale.US, "  %s", acc.getAccountName()));
 541 //                }
 542                 publishProgress(progress);
 543             }
 544
 545             throwIfCancelled();
 546         }
 547
 548         // json interface returns transactions if file order and the rest of the machinery
 549         // expects them in reverse chronological order
 550         Collections.sort(trList, (o1, o2) -> {
 551             int res = o2.getDate()
 552                         .compareTo(o1.getDate());
 553             if (res != 0)
 554                 return res;
 555             return Long.compare(o2.getId(), o1.getId());
 556         });
 557         return trList;
 558     }
 559
 560     @SuppressLint("DefaultLocale")
 561     @Override
 562     protected Result doInBackground(Void... params) {
 563         Data.backgroundTaskStarted();
 564         List<LedgerAccount> accounts;
 565         List<LedgerTransaction> transactions;
 566         try {
 567             accounts = retrieveAccountList();
 568             // accounts is null in API-version auto-detection and means
 569             // requesting 'html' API version via the JSON classes
 570             // this can't work, and the null results in the legacy code below
 571             // being called
 572             if (accounts == null)
 573                 transactions = null;
 574             else
 575                 transactions = retrieveTransactionList();
 576
 577             if (accounts == null || transactions == null) {
 578                 accounts = new ArrayList<>();
 579                 transactions = new ArrayList<>();
 580                 retrieveTransactionListLegacy(accounts, transactions);
 581             }
 582             mainModel.setAndStoreAccountAndTransactionListFromWeb(accounts, transactions);
 583
 584             return new Result(accounts, transactions);
 585         }
 586         catch (MalformedURLException e) {
 587             e.printStackTrace();
 588             return new Result("Invalid server URL");
 589         }
 590         catch (HTTPException e) {
 591             e.printStackTrace();
 592             return new Result(String.format("HTTP error %d: %s", e.getResponseCode(),
 593                     e.getResponseMessage()));
 594         }
 595         catch (IOException e) {
 596             e.printStackTrace();
 597             return new Result(e.getLocalizedMessage());
 598         }
 599         catch (RuntimeJsonMappingException e) {
 600             e.printStackTrace();
 601             return new Result(Result.ERR_JSON_PARSER_ERROR);
 602         }
 603         catch (ParseException e) {
 604             e.printStackTrace();
 605             return new Result("Network error");
 606         }
 607         catch (OperationCanceledException e) {
 608             e.printStackTrace();
 609             return new Result("Operation cancelled");
 610         }
 611         catch (ApiNotSupportedException e) {
 612             e.printStackTrace();
 613             return new Result("Server version not supported");
 614         }
 615         finally {
 616             Data.backgroundTaskFinished();
 617         }
 618     }
 619     public void throwIfCancelled() {
 620         if (isCancelled())
 621             throw new OperationCanceledException(null);
 622     }
 623     private enum ParserState {
 624         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_TRANSACTION,
 625         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 626     }
 627
 628     public enum ProgressState {STARTING, RUNNING, FINISHED}
 629
 630     public static class Progress {
 631         private int progress;
 632         private int total;
 633         private ProgressState state = ProgressState.RUNNING;
 634         private String error = null;
 635         private boolean indeterminate;
 636         Progress() {
 637             indeterminate = true;
 638         }
 639         Progress(int progress, int total) {
 640             this.indeterminate = false;
 641             this.progress = progress;
 642             this.total = total;
 643         }
 644         public static Progress indeterminate() {
 645             return new Progress();
 646         }
 647         public static Progress finished(String error) {
 648             Progress p = new Progress();
 649             p.setState(ProgressState.FINISHED);
 650             p.setError(error);
 651             return p;
 652         }
 653         public int getProgress() {
 654             ensureState(ProgressState.RUNNING);
 655             return progress;
 656         }
 657         protected void setProgress(int progress) {
 658             this.progress = progress;
 659             this.state = ProgressState.RUNNING;
 660         }
 661         public int getTotal() {
 662             ensureState(ProgressState.RUNNING);
 663             return total;
 664         }
 665         protected void setTotal(int total) {
 666             this.total = total;
 667             state = ProgressState.RUNNING;
 668             indeterminate = total == -1;
 669         }
 670         private void ensureState(ProgressState wanted) {
 671             if (state != wanted)
 672                 throw new IllegalStateException(
 673                         String.format("Bad state: %s, expected %s", state, wanted));
 674         }
 675         public ProgressState getState() {
 676             return state;
 677         }
 678         public void setState(ProgressState state) {
 679             this.state = state;
 680         }
 681         public String getError() {
 682             ensureState(ProgressState.FINISHED);
 683             return error;
 684         }
 685         public void setError(String error) {
 686             this.error = error;
 687             state = ProgressState.FINISHED;
 688         }
 689         public boolean isIndeterminate() {
 690             return indeterminate;
 691         }
 692         public void setIndeterminate(boolean indeterminate) {
 693             this.indeterminate = indeterminate;
 694         }
 695     }
 696
 697     private static class TransactionParserException extends IllegalStateException {
 698         TransactionParserException(String message) {
 699             super(message);
 700         }
 701     }
 702
 703     public static class Result {
 704         public static String ERR_JSON_PARSER_ERROR = "err_json_parser";
 705         public String error;
 706         public List<LedgerAccount> accounts;
 707         public List<LedgerTransaction> transactions;
 708         Result(String error) {
 709             this.error = error;
 710         }
 711         Result(List<LedgerAccount> accounts, List<LedgerTransaction> transactions) {
 712             this.accounts = accounts;
 713             this.transactions = transactions;
 714         }
 715     }
 716 }