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.annotation.NonNull;
  25 import androidx.annotation.Nullable;
  26 import androidx.lifecycle.LifecycleOwner;
  27 import androidx.lifecycle.MutableLiveData;
  28 import androidx.lifecycle.Observer;
  29
  30 import net.ktnx.mobileledger.App;
  31 import net.ktnx.mobileledger.async.RetrieveTransactionsTask;
  32 import net.ktnx.mobileledger.ui.activity.MainActivity;
  33 import net.ktnx.mobileledger.utils.LockHolder;
  34 import net.ktnx.mobileledger.utils.Locker;
  35 import net.ktnx.mobileledger.utils.Logger;
  36 import net.ktnx.mobileledger.utils.MLDB;
  37 import net.ktnx.mobileledger.utils.ObservableList;
  38 import net.ktnx.mobileledger.utils.SimpleDate;
  39
  40 import java.lang.ref.WeakReference;
  41 import java.text.NumberFormat;
  42 import java.util.ArrayList;
  43 import java.util.Date;
  44 import java.util.List;
  45 import java.util.Locale;
  46 import java.util.Objects;
  47 import java.util.concurrent.atomic.AtomicInteger;
  48
  49 import static net.ktnx.mobileledger.utils.Logger.debug;
  50
  51 public final class Data {
  52     public static final ObservableList<TransactionListItem> transactions =
  53             new ObservableList<>(new ArrayList<>());
  54     public static final MutableLiveData<SimpleDate> earliestTransactionDate =
  55             new MutableLiveData<>(null);
  56     public static final MutableLiveData<SimpleDate> latestTransactionDate =
  57             new MutableLiveData<>(null);
  58     public static final MutableLiveData<Boolean> backgroundTasksRunning =
  59             new MutableLiveData<>(false);
  60     public static final MutableLiveData<RetrieveTransactionsTask.Progress> backgroundTaskProgress =
  61             new MutableLiveData<>();
  62     public static final MutableLiveData<Date> lastUpdateDate = new MutableLiveData<>();
  63     public static final MutableLiveData<ArrayList<MobileLedgerProfile>> profiles =
  64             new MutableLiveData<>(null);
  65     public static final MutableLiveData<String> accountFilter = new MutableLiveData<>();
  66     public static final MutableLiveData<Currency.Position> currencySymbolPosition =
  67             new MutableLiveData<>();
  68     public static final MutableLiveData<Boolean> currencyGap = new MutableLiveData<>(true);
  69     public static final MutableLiveData<Locale> locale = new MutableLiveData<>(Locale.getDefault());
  70     public static final MutableLiveData<Boolean> drawerOpen = new MutableLiveData<>(false);
  71     private static final MutableLiveData<MobileLedgerProfile> profile =
  72             new InertMutableLiveData<>();
  73     private static final AtomicInteger backgroundTaskCount = new AtomicInteger(0);
  74     private static final Locker profilesLocker = new Locker();
  75     public static MutableLiveData<Integer> foundTransactionItemIndex = new MutableLiveData<>(null);
  76     private static RetrieveTransactionsTask retrieveTransactionsTask;
  77     @NonNull
  78     public static MobileLedgerProfile getProfile() {
  79         return Objects.requireNonNull(profile.getValue());
  80     }
  81     public static void backgroundTaskStarted() {
  82         int cnt = backgroundTaskCount.incrementAndGet();
  83         debug("data",
  84                 String.format(Locale.ENGLISH, "background task count is %d after incrementing",
  85                         cnt));
  86         backgroundTasksRunning.postValue(cnt > 0);
  87     }
  88     public static void backgroundTaskFinished() {
  89         int cnt = backgroundTaskCount.decrementAndGet();
  90         debug("data",
  91                 String.format(Locale.ENGLISH, "background task count is %d after decrementing",
  92                         cnt));
  93         backgroundTasksRunning.postValue(cnt > 0);
  94     }
  95     public static void setCurrentProfile(@NonNull MobileLedgerProfile newProfile) {
  96         MLDB.setOption(MLDB.OPT_PROFILE_UUID, newProfile.getUuid());
  97         stopTransactionsRetrieval();
  98         profile.setValue(newProfile);
  99     }
 100     public static int getProfileIndex(MobileLedgerProfile profile) {
 101         try (LockHolder ignored = profilesLocker.lockForReading()) {
 102             List<MobileLedgerProfile> prList = profiles.getValue();
 103             if (prList == null)
 104                 throw new AssertionError();
 105             for (int i = 0; i < prList.size(); i++) {
 106                 MobileLedgerProfile p = prList.get(i);
 107                 if (p.equals(profile))
 108                     return i;
 109             }
 110
 111             return -1;
 112         }
 113     }
 114     @SuppressWarnings("WeakerAccess")
 115     public static int getProfileIndex(String profileUUID) {
 116         try (LockHolder ignored = profilesLocker.lockForReading()) {
 117             List<MobileLedgerProfile> prList = profiles.getValue();
 118             if (prList == null)
 119                 throw new AssertionError();
 120             for (int i = 0; i < prList.size(); i++) {
 121                 MobileLedgerProfile p = prList.get(i);
 122                 if (p.getUuid()
 123                      .equals(profileUUID))
 124                     return i;
 125             }
 126
 127             return -1;
 128         }
 129     }
 130     public static int retrieveCurrentThemeIdFromDb() {
 131         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 132         if (profileUUID == null)
 133             return -1;
 134
 135         SQLiteDatabase db = App.getDatabase();
 136         try (Cursor c = db.rawQuery("SELECT theme from profiles where uuid=?",
 137                 new String[]{profileUUID}))
 138         {
 139             if (c.moveToNext())
 140                 return c.getInt(0);
 141         }
 142
 143         return -1;
 144     }
 145     @Nullable
 146     public static MobileLedgerProfile getProfile(String profileUUID) {
 147         MobileLedgerProfile profile;
 148         try (LockHolder readLock = profilesLocker.lockForReading()) {
 149             List<MobileLedgerProfile> prList = profiles.getValue();
 150             if ((prList == null) || prList.isEmpty()) {
 151                 readLock.close();
 152                 try (LockHolder ignored = profilesLocker.lockForWriting()) {
 153                     profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 154                 }
 155             }
 156             else {
 157                 int i = getProfileIndex(profileUUID);
 158                 if (i == -1)
 159                     i = 0;
 160                 profile = prList.get(i);
 161             }
 162         }
 163         return profile;
 164     }
 165     public synchronized static void scheduleTransactionListRetrieval(MainActivity activity) {
 166         if (retrieveTransactionsTask != null) {
 167             Logger.debug("db", "Ignoring request for transaction retrieval - already active");
 168             return;
 169         }
 170         MobileLedgerProfile pr = profile.getValue();
 171         if (pr == null) {
 172             Logger.debug("ui", "Ignoring refresh -- no current profile");
 173             return;
 174         }
 175
 176         retrieveTransactionsTask =
 177                 new RetrieveTransactionsTask(new WeakReference<>(activity), profile.getValue());
 178         Logger.debug("db", "Created a background transaction retrieval task");
 179
 180         retrieveTransactionsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 181     }
 182     public static synchronized void stopTransactionsRetrieval() {
 183         if (retrieveTransactionsTask != null)
 184             retrieveTransactionsTask.cancel(false);
 185     }
 186     public static void transactionRetrievalDone() {
 187         retrieveTransactionsTask = null;
 188     }
 189     public static void refreshCurrencyData(Locale locale) {
 190         NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
 191         java.util.Currency currency = formatter.getCurrency();
 192         String symbol = currency.getSymbol();
 193         Logger.debug("locale", String.format(
 194                 "Discovering currency symbol position for locale %s (currency is %s; symbol is %s)",
 195                 locale.toString(), currency.toString(), symbol));
 196         String formatted = formatter.format(1234.56f);
 197         Logger.debug("locale", String.format("1234.56 formats as '%s'", formatted));
 198
 199         if (formatted.startsWith(symbol)) {
 200             currencySymbolPosition.setValue(Currency.Position.before);
 201
 202             // is the currency symbol directly followed by the first formatted digit?
 203             final char canary = formatted.charAt(symbol.length());
 204             currencyGap.setValue(canary != '1');
 205         }
 206         else if (formatted.endsWith(symbol)) {
 207             currencySymbolPosition.setValue(Currency.Position.after);
 208
 209             // is the currency symbol directly preceded bu the last formatted digit?
 210             final char canary = formatted.charAt(formatted.length() - symbol.length() - 1);
 211             currencyGap.setValue(canary != '6');
 212         }
 213         else
 214             currencySymbolPosition.setValue(Currency.Position.none);
 215     }
 216
 217     public static void observeProfile(LifecycleOwner lifecycleOwner,
 218                                       Observer<MobileLedgerProfile> observer) {
 219         profile.observe(lifecycleOwner, observer);
 220     }
 221     public synchronized static MobileLedgerProfile initProfile() {
 222         MobileLedgerProfile currentProfile = profile.getValue();
 223         if (currentProfile != null)
 224             return currentProfile;
 225
 226         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 227         MobileLedgerProfile startupProfile = getProfile(profileUUID);
 228         if (startupProfile != null)
 229             setCurrentProfile(startupProfile);
 230         return startupProfile;
 231     }
 232
 233     public static void removeProfileObservers(LifecycleOwner owner) {
 234         profile.removeObservers(owner);
 235     }
 236 }