app/src/main/java/net/ktnx/mobileledger/model/Data.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.model;
  19
  20 import android.database.Cursor;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23
  24 import androidx.lifecycle.MutableLiveData;
  25
  26 import net.ktnx.mobileledger.App;
  27 import net.ktnx.mobileledger.async.RetrieveTransactionsTask;
  28 import net.ktnx.mobileledger.ui.activity.MainActivity;
  29 import net.ktnx.mobileledger.utils.LockHolder;
  30 import net.ktnx.mobileledger.utils.Locker;
  31 import net.ktnx.mobileledger.utils.Logger;
  32 import net.ktnx.mobileledger.utils.MLDB;
  33 import net.ktnx.mobileledger.utils.ObservableList;
  34
  35 import java.lang.ref.WeakReference;
  36 import java.text.NumberFormat;
  37 import java.util.ArrayList;
  38 import java.util.Date;
  39 import java.util.List;
  40 import java.util.Locale;
  41 import java.util.concurrent.atomic.AtomicInteger;
  42
  43 import static net.ktnx.mobileledger.utils.Logger.debug;
  44
  45 public final class Data {
  46     public static ObservableList<TransactionListItem> transactions =
  47             new ObservableList<>(new ArrayList<>());
  48     public static ObservableList<LedgerAccount> accounts = new ObservableList<>(new ArrayList<>());
  49     public static MutableLiveData<Boolean> backgroundTasksRunning = new MutableLiveData<>(false);
  50     public static MutableLiveData<Date> lastUpdateDate = new MutableLiveData<>();
  51     public static MutableLiveData<MobileLedgerProfile> profile = new MutableLiveData<>();
  52     public static MutableLiveData<ArrayList<MobileLedgerProfile>> profiles =
  53             new MutableLiveData<>(null);
  54     public static MutableLiveData<String> accountFilter = new MutableLiveData<>();
  55     public static MutableLiveData<Currency.Position> currencySymbolPosition =
  56             new MutableLiveData<>();
  57     public static MutableLiveData<Boolean> currencyGap = new MutableLiveData<>(true);
  58     public static MutableLiveData<Locale> locale = new MutableLiveData<>(Locale.getDefault());
  59     private static AtomicInteger backgroundTaskCount = new AtomicInteger(0);
  60     private static Locker profilesLocker = new Locker();
  61     private static RetrieveTransactionsTask retrieveTransactionsTask;
  62     public static void backgroundTaskStarted() {
  63         int cnt = backgroundTaskCount.incrementAndGet();
  64         debug("data",
  65                 String.format(Locale.ENGLISH, "background task count is %d after incrementing",
  66                         cnt));
  67         backgroundTasksRunning.postValue(cnt > 0);
  68     }
  69     public static void backgroundTaskFinished() {
  70         int cnt = backgroundTaskCount.decrementAndGet();
  71         debug("data",
  72                 String.format(Locale.ENGLISH, "background task count is %d after decrementing",
  73                         cnt));
  74         backgroundTasksRunning.postValue(cnt > 0);
  75     }
  76     public static void setCurrentProfile(MobileLedgerProfile newProfile) {
  77         MLDB.setOption(MLDB.OPT_PROFILE_UUID, (newProfile == null) ? null : newProfile.getUuid());
  78         stopTransactionsRetrieval();
  79         profile.setValue(newProfile);
  80     }
  81     public static int getProfileIndex(MobileLedgerProfile profile) {
  82         try (LockHolder ignored = profilesLocker.lockForReading()) {
  83             List<MobileLedgerProfile> prList = profiles.getValue();
  84             if (prList == null)
  85                 throw new AssertionError();
  86             for (int i = 0; i < prList.size(); i++) {
  87                 MobileLedgerProfile p = prList.get(i);
  88                 if (p.equals(profile))
  89                     return i;
  90             }
  91
  92             return -1;
  93         }
  94     }
  95     @SuppressWarnings("WeakerAccess")
  96     public static int getProfileIndex(String profileUUID) {
  97         try (LockHolder ignored = profilesLocker.lockForReading()) {
  98             List<MobileLedgerProfile> prList = profiles.getValue();
  99             if (prList == null)
 100                 throw new AssertionError();
 101             for (int i = 0; i < prList.size(); i++) {
 102                 MobileLedgerProfile p = prList.get(i);
 103                 if (p.getUuid()
 104                      .equals(profileUUID))
 105                     return i;
 106             }
 107
 108             return -1;
 109         }
 110     }
 111     public static int retrieveCurrentThemeIdFromDb() {
 112         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 113         if (profileUUID == null)
 114             return -1;
 115
 116         SQLiteDatabase db = App.getDatabase();
 117         try (Cursor c = db.rawQuery("SELECT theme from profiles where uuid=?",
 118                 new String[]{profileUUID}))
 119         {
 120             if (c.moveToNext())
 121                 return c.getInt(0);
 122         }
 123
 124         return -1;
 125     }
 126     public static MobileLedgerProfile getProfile(String profileUUID) {
 127         MobileLedgerProfile profile;
 128         try (LockHolder readLock = profilesLocker.lockForReading()) {
 129             List<MobileLedgerProfile> prList = profiles.getValue();
 130             if ((prList == null) || prList.isEmpty()) {
 131                 readLock.close();
 132                 try (LockHolder ignored = profilesLocker.lockForWriting()) {
 133                     profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 134                 }
 135             }
 136             else {
 137                 int i = getProfileIndex(profileUUID);
 138                 if (i == -1)
 139                     i = 0;
 140                 profile = prList.get(i);
 141             }
 142         }
 143         return profile;
 144     }
 145     public synchronized static void scheduleTransactionListRetrieval(MainActivity activity) {
 146         if (retrieveTransactionsTask != null) {
 147             Logger.debug("db", "Ignoring request for transaction retrieval - already active");
 148             return;
 149         }
 150         MobileLedgerProfile pr = profile.getValue();
 151         if (pr == null) {
 152             Logger.debug("ui", "Ignoring refresh -- no current profile");
 153             return;
 154         }
 155
 156         retrieveTransactionsTask =
 157                 new RetrieveTransactionsTask(new WeakReference<>(activity), profile.getValue());
 158         Logger.debug("db", "Created a background transaction retrieval task");
 159
 160         retrieveTransactionsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 161     }
 162     public static synchronized void stopTransactionsRetrieval() {
 163         if (retrieveTransactionsTask != null)
 164             retrieveTransactionsTask.cancel(false);
 165     }
 166     public static void transactionRetrievalDone() {
 167         retrieveTransactionsTask = null;
 168     }
 169     public static void refreshCurrencyData(Locale locale) {
 170         NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
 171         java.util.Currency currency = formatter.getCurrency();
 172         String symbol = currency.getSymbol();
 173         Logger.debug("locale", String.format(
 174                 "Discovering currency symbol position for locale %s (currency is %s; symbol is %s)",
 175                 locale.toString(), currency.toString(), symbol));
 176         String formatted = formatter.format(1234.56f);
 177         Logger.debug("locale", String.format("1234.56 formats as '%s'", formatted));
 178
 179         if (formatted.startsWith(symbol)) {
 180             currencySymbolPosition.setValue(Currency.Position.before);
 181
 182             // is the currency symbol directly followed by the first formatted digit?
 183             final char canary = formatted.charAt(symbol.length());
 184             currencyGap.setValue(canary != '1');
 185         }
 186         else if (formatted.endsWith(symbol)) {
 187             currencySymbolPosition.setValue(Currency.Position.after);
 188
 189             // is the currency symbol directly preceded bu the last formatted digit?
 190             final char canary = formatted.charAt(formatted.length() - symbol.length() - 1);
 191             currencyGap.setValue(canary != '6');
 192         }
 193         else
 194             currencySymbolPosition.setValue(Currency.Position.none);
 195     }
 196
 197 }