app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListViewModel.java

   1 /*
   2  * Copyright © 2018 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger 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  * Mobile-Ledger 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 Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.transaction_list;
  19
  20 import android.arch.lifecycle.ViewModel;
  21 import android.database.Cursor;
  22 import android.database.sqlite.SQLiteDatabase;
  23
  24 import net.ktnx.mobileledger.model.LedgerTransaction;
  25 import net.ktnx.mobileledger.model.LedgerTransactionItem;
  26 import net.ktnx.mobileledger.utils.MobileLedgerDatabase;
  27
  28 import java.util.ArrayList;
  29 import java.util.List;
  30
  31 public class TransactionListViewModel extends ViewModel {
  32
  33     private List<LedgerTransaction> transactions;
  34
  35     public List<LedgerTransaction> getTransactions(MobileLedgerDatabase dbh) {
  36         if (transactions == null) {
  37             transactions = new ArrayList<>();
  38             reloadTransactions(dbh);
  39         }
  40
  41         return transactions;
  42     }
  43     private void reloadTransactions(MobileLedgerDatabase dbh) {
  44         transactions.clear();
  45         String sql = "SELECT id, date, description FROM transactions";
  46         sql += " ORDER BY date desc, id desc";
  47
  48         try (SQLiteDatabase db = dbh.getReadableDatabase()) {
  49             try (Cursor cursor = db.rawQuery(sql, null)) {
  50                 while (cursor.moveToNext()) {
  51                     LedgerTransaction tr =
  52                             new LedgerTransaction(cursor.getString(0), cursor.getString(1),
  53                                     cursor.getString(2));
  54                     try (Cursor cAcc = db.rawQuery("SELECT account_name, amount, currency FROM " +
  55                                                    "transaction_accounts WHERE transaction_id = ?",
  56                             new String[]{tr.getId()}))
  57                     {
  58                         while (cAcc.moveToNext()) {
  59                             tr.add_item(
  60                                     new LedgerTransactionItem(cAcc.getString(0), cAcc.getFloat(1),
  61                                             cAcc.getString(2)));
  62                         }
  63                     }
  64                     transactions.add(tr);
  65                 }
  66             }
  67         }
  68
  69     }
  70 }