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     private static AtomicInteger backgroundTaskCount = new AtomicInteger(0);
  59     private static Locker profilesLocker = new Locker();
  60     private static RetrieveTransactionsTask retrieveTransactionsTask;
  61     public static void backgroundTaskStarted() {
  62         int cnt = backgroundTaskCount.incrementAndGet();
  63         debug("data",
  64                 String.format(Locale.ENGLISH, "background task count is %d after incrementing",
  65                         cnt));
  66         backgroundTasksRunning.postValue(cnt > 0);
  67     }
  68     public static void backgroundTaskFinished() {
  69         int cnt = backgroundTaskCount.decrementAndGet();
  70         debug("data",
  71                 String.format(Locale.ENGLISH, "background task count is %d after decrementing",
  72                         cnt));
  73         backgroundTasksRunning.postValue(cnt > 0);
  74     }
  75     public static void setCurrentProfile(MobileLedgerProfile newProfile) {
  76         MLDB.setOption(MLDB.OPT_PROFILE_UUID, (newProfile == null) ? null : newProfile.getUuid());
  77         stopTransactionsRetrieval();
  78         profile.postValue(newProfile);
  79     }
  80     public static int getProfileIndex(MobileLedgerProfile profile) {
  81         try (LockHolder ignored = profilesLocker.lockForReading()) {
  82             List<MobileLedgerProfile> prList = profiles.getValue();
  83             if (prList == null)
  84                 throw new AssertionError();
  85             for (int i = 0; i < prList.size(); i++) {
  86                 MobileLedgerProfile p = prList.get(i);
  87                 if (p.equals(profile))
  88                     return i;
  89             }
  90
  91             return -1;
  92         }
  93     }
  94     @SuppressWarnings("WeakerAccess")
  95     public static int getProfileIndex(String profileUUID) {
  96         try (LockHolder ignored = profilesLocker.lockForReading()) {
  97             List<MobileLedgerProfile> prList = profiles.getValue();
  98             if (prList == null)
  99                 throw new AssertionError();
 100             for (int i = 0; i < prList.size(); i++) {
 101                 MobileLedgerProfile p = prList.get(i);
 102                 if (p.getUuid()
 103                      .equals(profileUUID))
 104                     return i;
 105             }
 106
 107             return -1;
 108         }
 109     }
 110     public static int retrieveCurrentThemeIdFromDb() {
 111         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 112         if (profileUUID == null)
 113             return -1;
 114
 115         SQLiteDatabase db = App.getDatabase();
 116         try (Cursor c = db.rawQuery("SELECT theme from profiles where uuid=?",
 117                 new String[]{profileUUID}))
 118         {
 119             if (c.moveToNext())
 120                 return c.getInt(0);
 121         }
 122
 123         return -1;
 124     }
 125     public static MobileLedgerProfile getProfile(String profileUUID) {
 126         MobileLedgerProfile profile;
 127         try (LockHolder readLock = profilesLocker.lockForReading()) {
 128             List<MobileLedgerProfile> prList = profiles.getValue();
 129             if ((prList == null) || prList.isEmpty()) {
 130                 readLock.close();
 131                 try (LockHolder ignored = profilesLocker.lockForWriting()) {
 132                     profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 133                 }
 134             }
 135             else {
 136                 int i = getProfileIndex(profileUUID);
 137                 if (i == -1)
 138                     i = 0;
 139                 profile = prList.get(i);
 140             }
 141         }
 142         return profile;
 143     }
 144     public synchronized static void scheduleTransactionListRetrieval(MainActivity activity) {
 145         if (retrieveTransactionsTask != null) {
 146             Logger.debug("db", "Ignoring request for transaction retrieval - already active");
 147             return;
 148         }
 149         MobileLedgerProfile pr = profile.getValue();
 150         if (pr == null)
 151             throw new IllegalStateException("No current profile");
 152
 153         retrieveTransactionsTask =
 154                 new RetrieveTransactionsTask(new WeakReference<>(activity), profile.getValue());
 155         Logger.debug("db", "Created a background transaction retrieval task");
 156
 157         retrieveTransactionsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 158     }
 159     public static synchronized void stopTransactionsRetrieval() {
 160         if (retrieveTransactionsTask != null)
 161             retrieveTransactionsTask.cancel(false);
 162     }
 163     public static void transactionRetrievalDone() {
 164         retrieveTransactionsTask = null;
 165     }
 166     public static void refreshCurrencyData(Locale locale) {
 167         NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
 168         java.util.Currency currency = formatter.getCurrency();
 169         String symbol = currency.getSymbol();
 170         Logger.debug("locale", String.format(
 171                 "Discovering currency symbol position for locale %s (currency is %s; symbol is %s)",
 172                 locale.toString(), currency.toString(), symbol));
 173         String formatted = formatter.format(1234.56f);
 174         Logger.debug("locale", String.format("1234.56 formats as '%s'", formatted));
 175
 176         if (formatted.startsWith(symbol)) {
 177             currencySymbolPosition.setValue(Currency.Position.before);
 178
 179             // is the currency symbol directly followed by the first formatted digit?
 180             final char canary = formatted.charAt(symbol.length());
 181             currencyGap.setValue(canary != '1');
 182         }
 183         else if (formatted.endsWith(symbol)) {
 184             currencySymbolPosition.setValue(Currency.Position.after);
 185
 186             // is the currency symbol directly preceded bu the last formatted digit?
 187             final char canary = formatted.charAt(formatted.length() - symbol.length() - 1);
 188             currencyGap.setValue(canary != '6');
 189         }
 190         else
 191             currencySymbolPosition.setValue(Currency.Position.none);
 192     }
 193
 194 }