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[mobile-ledger.git] / 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.App;
25 import net.ktnx.mobileledger.model.Data;
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 = App.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 }