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<>();
  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
  78     static {
  79         locale.setValue(Locale.getDefault());
  80     }
  81
  82     @NonNull
  83     public static MobileLedgerProfile getProfile() {
  84         return Objects.requireNonNull(profile.getValue());
  85     }
  86     public static void backgroundTaskStarted() {
  87         int cnt = backgroundTaskCount.incrementAndGet();
  88         debug("data",
  89                 String.format(Locale.ENGLISH, "background task count is %d after incrementing",
  90                         cnt));
  91         backgroundTasksRunning.postValue(cnt > 0);
  92     }
  93     public static void backgroundTaskFinished() {
  94         int cnt = backgroundTaskCount.decrementAndGet();
  95         debug("data",
  96                 String.format(Locale.ENGLISH, "background task count is %d after decrementing",
  97                         cnt));
  98         backgroundTasksRunning.postValue(cnt > 0);
  99     }
 100     public static void setCurrentProfile(@NonNull MobileLedgerProfile newProfile) {
 101         MLDB.setOption(MLDB.OPT_PROFILE_UUID, newProfile.getUuid());
 102         stopTransactionsRetrieval();
 103         profile.setValue(newProfile);
 104     }
 105     public static int getProfileIndex(MobileLedgerProfile profile) {
 106         try (LockHolder ignored = profilesLocker.lockForReading()) {
 107             List<MobileLedgerProfile> prList = profiles.getValue();
 108             if (prList == null)
 109                 throw new AssertionError();
 110             for (int i = 0; i < prList.size(); i++) {
 111                 MobileLedgerProfile p = prList.get(i);
 112                 if (p.equals(profile))
 113                     return i;
 114             }
 115
 116             return -1;
 117         }
 118     }
 119     @SuppressWarnings("WeakerAccess")
 120     public static int getProfileIndex(String profileUUID) {
 121         try (LockHolder ignored = profilesLocker.lockForReading()) {
 122             List<MobileLedgerProfile> prList = profiles.getValue();
 123             if (prList == null)
 124                 throw new AssertionError();
 125             for (int i = 0; i < prList.size(); i++) {
 126                 MobileLedgerProfile p = prList.get(i);
 127                 if (p.getUuid()
 128                      .equals(profileUUID))
 129                     return i;
 130             }
 131
 132             return -1;
 133         }
 134     }
 135     public static int retrieveCurrentThemeIdFromDb() {
 136         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 137         if (profileUUID == null)
 138             return -1;
 139
 140         SQLiteDatabase db = App.getDatabase();
 141         try (Cursor c = db.rawQuery("SELECT theme from profiles where uuid=?",
 142                 new String[]{profileUUID}))
 143         {
 144             if (c.moveToNext())
 145                 return c.getInt(0);
 146         }
 147
 148         return -1;
 149     }
 150     @Nullable
 151     public static MobileLedgerProfile getProfile(String profileUUID) {
 152         MobileLedgerProfile profile;
 153         try (LockHolder readLock = profilesLocker.lockForReading()) {
 154             List<MobileLedgerProfile> prList = profiles.getValue();
 155             if ((prList == null) || prList.isEmpty()) {
 156                 readLock.close();
 157                 try (LockHolder ignored = profilesLocker.lockForWriting()) {
 158                     profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 159                 }
 160             }
 161             else {
 162                 int i = getProfileIndex(profileUUID);
 163                 if (i == -1)
 164                     i = 0;
 165                 profile = prList.get(i);
 166             }
 167         }
 168         return profile;
 169     }
 170     public synchronized static void scheduleTransactionListRetrieval(MainActivity activity) {
 171         if (retrieveTransactionsTask != null) {
 172             Logger.debug("db", "Ignoring request for transaction retrieval - already active");
 173             return;
 174         }
 175         MobileLedgerProfile pr = profile.getValue();
 176         if (pr == null) {
 177             Logger.debug("ui", "Ignoring refresh -- no current profile");
 178             return;
 179         }
 180
 181         retrieveTransactionsTask =
 182                 new RetrieveTransactionsTask(new WeakReference<>(activity), profile.getValue());
 183         Logger.debug("db", "Created a background transaction retrieval task");
 184
 185         retrieveTransactionsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 186     }
 187     public static synchronized void stopTransactionsRetrieval() {
 188         if (retrieveTransactionsTask != null)
 189             retrieveTransactionsTask.cancel(false);
 190     }
 191     public static void transactionRetrievalDone() {
 192         retrieveTransactionsTask = null;
 193     }
 194     public static void refreshCurrencyData(Locale locale) {
 195         NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
 196         java.util.Currency currency = formatter.getCurrency();
 197         String symbol = currency != null ? currency.getSymbol() : "";
 198         Logger.debug("locale", String.format(
 199                 "Discovering currency symbol position for locale %s (currency is %s; symbol is %s)",
 200                 locale.toString(), currency != null ? currency.toString() : "<none>", symbol));
 201         String formatted = formatter.format(1234.56f);
 202         Logger.debug("locale", String.format("1234.56 formats as '%s'", formatted));
 203
 204         if (formatted.startsWith(symbol)) {
 205             currencySymbolPosition.setValue(Currency.Position.before);
 206
 207             // is the currency symbol directly followed by the first formatted digit?
 208             final char canary = formatted.charAt(symbol.length());
 209             currencyGap.setValue(canary != '1');
 210         }
 211         else if (formatted.endsWith(symbol)) {
 212             currencySymbolPosition.setValue(Currency.Position.after);
 213
 214             // is the currency symbol directly preceded bu the last formatted digit?
 215             final char canary = formatted.charAt(formatted.length() - symbol.length() - 1);
 216             currencyGap.setValue(canary != '6');
 217         }
 218         else
 219             currencySymbolPosition.setValue(Currency.Position.none);
 220     }
 221
 222     public static void observeProfile(LifecycleOwner lifecycleOwner,
 223                                       Observer<MobileLedgerProfile> observer) {
 224         profile.observe(lifecycleOwner, observer);
 225     }
 226     public synchronized static MobileLedgerProfile initProfile() {
 227         MobileLedgerProfile currentProfile = profile.getValue();
 228         if (currentProfile != null)
 229             return currentProfile;
 230
 231         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 232         MobileLedgerProfile startupProfile = getProfile(profileUUID);
 233         if (startupProfile != null)
 234             setCurrentProfile(startupProfile);
 235         return startupProfile;
 236     }
 237
 238     public static void removeProfileObservers(LifecycleOwner owner) {
 239         profile.removeObservers(owner);
 240     }
 241 }