app/src/main/java/net/ktnx/mobileledger/model/Data.java

   1 /*
   2  * Copyright © 2020 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 import net.ktnx.mobileledger.utils.SimpleDate;
  35
  36 import java.lang.ref.WeakReference;
  37 import java.text.NumberFormat;
  38 import java.util.ArrayList;
  39 import java.util.Date;
  40 import java.util.List;
  41 import java.util.Locale;
  42 import java.util.concurrent.atomic.AtomicInteger;
  43
  44 import static net.ktnx.mobileledger.utils.Logger.debug;
  45
  46 public final class Data {
  47     public static final ObservableList<TransactionListItem> transactions =
  48             new ObservableList<>(new ArrayList<>());
  49     public static final MutableLiveData<SimpleDate> earliestTransactionDate =
  50             new MutableLiveData<>(null);
  51     public static final MutableLiveData<SimpleDate> latestTransactionDate =
  52             new MutableLiveData<>(null);
  53     public static final MutableLiveData<Boolean> backgroundTasksRunning =
  54             new MutableLiveData<>(false);
  55     public static final MutableLiveData<Date> lastUpdateDate = new MutableLiveData<>();
  56     public static final MutableLiveData<ArrayList<MobileLedgerProfile>> profiles =
  57             new MutableLiveData<>(null);
  58     public static final MutableLiveData<String> accountFilter = new MutableLiveData<>();
  59     public static final MutableLiveData<Currency.Position> currencySymbolPosition =
  60             new MutableLiveData<>();
  61     public static final MutableLiveData<Boolean> currencyGap = new MutableLiveData<>(true);
  62     public static final MutableLiveData<Locale> locale = new MutableLiveData<>(Locale.getDefault());
  63     public static final MutableLiveData<Boolean> drawerOpen = new MutableLiveData<>(false);
  64     private static final MutableLiveData<MobileLedgerProfile> profile =
  65             new InertMutableLiveData<>();
  66     private static final AtomicInteger backgroundTaskCount = new AtomicInteger(0);
  67     private static final Locker profilesLocker = new Locker();
  68     public static MutableLiveData<Integer> foundTransactionItemIndex = new MutableLiveData<>(null);
  69     private static RetrieveTransactionsTask retrieveTransactionsTask;
  70     @NonNull
  71     public static MobileLedgerProfile getProfile() {
  72         return Objects.requireNonNull(profile.getValue());
  73     }
  74     public static void backgroundTaskStarted() {
  75         int cnt = backgroundTaskCount.incrementAndGet();
  76         debug("data",
  77                 String.format(Locale.ENGLISH, "background task count is %d after incrementing",
  78                         cnt));
  79         backgroundTasksRunning.postValue(cnt > 0);
  80     }
  81     public static void backgroundTaskFinished() {
  82         int cnt = backgroundTaskCount.decrementAndGet();
  83         debug("data",
  84                 String.format(Locale.ENGLISH, "background task count is %d after decrementing",
  85                         cnt));
  86         backgroundTasksRunning.postValue(cnt > 0);
  87     }
  88     public static void setCurrentProfile(@NonNull MobileLedgerProfile newProfile) {
  89         MLDB.setOption(MLDB.OPT_PROFILE_UUID, newProfile.getUuid());
  90         stopTransactionsRetrieval();
  91         profile.setValue(newProfile);
  92     }
  93     public static int getProfileIndex(MobileLedgerProfile profile) {
  94         try (LockHolder ignored = profilesLocker.lockForReading()) {
  95             List<MobileLedgerProfile> prList = profiles.getValue();
  96             if (prList == null)
  97                 throw new AssertionError();
  98             for (int i = 0; i < prList.size(); i++) {
  99                 MobileLedgerProfile p = prList.get(i);
 100                 if (p.equals(profile))
 101                     return i;
 102             }
 103
 104             return -1;
 105         }
 106     }
 107     @SuppressWarnings("WeakerAccess")
 108     public static int getProfileIndex(String profileUUID) {
 109         try (LockHolder ignored = profilesLocker.lockForReading()) {
 110             List<MobileLedgerProfile> prList = profiles.getValue();
 111             if (prList == null)
 112                 throw new AssertionError();
 113             for (int i = 0; i < prList.size(); i++) {
 114                 MobileLedgerProfile p = prList.get(i);
 115                 if (p.getUuid()
 116                      .equals(profileUUID))
 117                     return i;
 118             }
 119
 120             return -1;
 121         }
 122     }
 123     public static int retrieveCurrentThemeIdFromDb() {
 124         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 125         if (profileUUID == null)
 126             return -1;
 127
 128         SQLiteDatabase db = App.getDatabase();
 129         try (Cursor c = db.rawQuery("SELECT theme from profiles where uuid=?",
 130                 new String[]{profileUUID}))
 131         {
 132             if (c.moveToNext())
 133                 return c.getInt(0);
 134         }
 135
 136         return -1;
 137     }
 138     @Nullable
 139     public static MobileLedgerProfile getProfile(String profileUUID) {
 140         MobileLedgerProfile profile;
 141         try (LockHolder readLock = profilesLocker.lockForReading()) {
 142             List<MobileLedgerProfile> prList = profiles.getValue();
 143             if ((prList == null) || prList.isEmpty()) {
 144                 readLock.close();
 145                 try (LockHolder ignored = profilesLocker.lockForWriting()) {
 146                     profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 147                 }
 148             }
 149             else {
 150                 int i = getProfileIndex(profileUUID);
 151                 if (i == -1)
 152                     i = 0;
 153                 profile = prList.get(i);
 154             }
 155         }
 156         return profile;
 157     }
 158     public synchronized static void scheduleTransactionListRetrieval(MainActivity activity) {
 159         if (retrieveTransactionsTask != null) {
 160             Logger.debug("db", "Ignoring request for transaction retrieval - already active");
 161             return;
 162         }
 163         MobileLedgerProfile pr = profile.getValue();
 164         if (pr == null) {
 165             Logger.debug("ui", "Ignoring refresh -- no current profile");
 166             return;
 167         }
 168
 169         retrieveTransactionsTask =
 170                 new RetrieveTransactionsTask(new WeakReference<>(activity), profile.getValue());
 171         Logger.debug("db", "Created a background transaction retrieval task");
 172
 173         retrieveTransactionsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 174     }
 175     public static synchronized void stopTransactionsRetrieval() {
 176         if (retrieveTransactionsTask != null)
 177             retrieveTransactionsTask.cancel(false);
 178     }
 179     public static void transactionRetrievalDone() {
 180         retrieveTransactionsTask = null;
 181     }
 182     public static void refreshCurrencyData(Locale locale) {
 183         NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
 184         java.util.Currency currency = formatter.getCurrency();
 185         String symbol = currency.getSymbol();
 186         Logger.debug("locale", String.format(
 187                 "Discovering currency symbol position for locale %s (currency is %s; symbol is %s)",
 188                 locale.toString(), currency.toString(), symbol));
 189         String formatted = formatter.format(1234.56f);
 190         Logger.debug("locale", String.format("1234.56 formats as '%s'", formatted));
 191
 192         if (formatted.startsWith(symbol)) {
 193             currencySymbolPosition.setValue(Currency.Position.before);
 194
 195             // is the currency symbol directly followed by the first formatted digit?
 196             final char canary = formatted.charAt(symbol.length());
 197             currencyGap.setValue(canary != '1');
 198         }
 199         else if (formatted.endsWith(symbol)) {
 200             currencySymbolPosition.setValue(Currency.Position.after);
 201
 202             // is the currency symbol directly preceded bu the last formatted digit?
 203             final char canary = formatted.charAt(formatted.length() - symbol.length() - 1);
 204             currencyGap.setValue(canary != '6');
 205         }
 206         else
 207             currencySymbolPosition.setValue(Currency.Position.none);
 208     }
 209
 210     public static void observeProfile(LifecycleOwner lifecycleOwner,
 211                                       Observer<MobileLedgerProfile> observer) {
 212         profile.observe(lifecycleOwner, observer);
 213     }
 214     public synchronized static MobileLedgerProfile initProfile() {
 215         MobileLedgerProfile currentProfile = profile.getValue();
 216         if (currentProfile != null)
 217             return currentProfile;
 218
 219         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 220         MobileLedgerProfile startupProfile = getProfile(profileUUID);
 221         if (startupProfile != null)
 222             setCurrentProfile(startupProfile);
 223         return startupProfile;
 224     }
 225
 226     public static void removeProfileObservers(LifecycleOwner owner) {
 227         profile.removeObservers(owner);
 228     }
 229 }