app/src/main/java/net/ktnx/mobileledger/async/RefreshDescriptionsTask.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.async;
  19
  20 import android.database.Cursor;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23
  24 import net.ktnx.mobileledger.model.Data;
  25 import net.ktnx.mobileledger.utils.MLDB;
  26
  27 import java.util.HashMap;
  28 import java.util.Map;
  29
  30 import static net.ktnx.mobileledger.utils.Logger.debug;
  31
  32 public class RefreshDescriptionsTask extends AsyncTask<Void, Void, Void> {
  33     @Override
  34     protected Void doInBackground(Void... voids) {
  35         Map<String, Boolean> unique = new HashMap<>();
  36
  37         debug("descriptions", "Starting refresh");
  38         SQLiteDatabase db = MLDB.getDatabase();
  39
  40         Data.backgroundTaskStarted();
  41         try {
  42             db.beginTransaction();
  43             try {
  44                 db.execSQL("UPDATE description_history set keep=0");
  45                 try (Cursor c = db
  46                         .rawQuery("SELECT distinct description from transactions", null))
  47                 {
  48                     while (c.moveToNext()) {
  49                         String description = c.getString(0);
  50                         String descriptionUpper = description.toUpperCase();
  51                         if (unique.containsKey(descriptionUpper)) continue;
  52
  53                         db.execSQL(
  54                                 "replace into description_history(description, description_upper, " +
  55                                 "keep) values(?, ?, 1)", new String[]{description, descriptionUpper});
  56                         unique.put(descriptionUpper, true);
  57                     }
  58                 }
  59                 db.execSQL("DELETE from description_history where keep=0");
  60                 db.setTransactionSuccessful();
  61                 debug("descriptions", "Refresh successful");
  62             }
  63             finally {
  64                 db.endTransaction();
  65             }
  66         }
  67         finally {
  68             Data.backgroundTaskFinished();
  69             debug("descriptions", "Refresh done");
  70         }
  71
  72         return null;
  73     }
  74 }