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.
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.
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/>.
18 package net.ktnx.mobileledger.utils;
20 import android.app.Application;
21 import android.content.res.Resources;
22 import android.database.SQLException;
23 import android.database.sqlite.SQLiteDatabase;
24 import android.database.sqlite.SQLiteOpenHelper;
25 import android.util.Log;
27 import java.io.BufferedReader;
28 import java.io.IOException;
29 import java.io.InputStream;
30 import java.io.InputStreamReader;
31 import java.util.Locale;
33 import static net.ktnx.mobileledger.utils.Logger.debug;
35 public class MobileLedgerDatabase extends SQLiteOpenHelper {
36 private static final String DB_NAME = "MoLe.db";
37 private static final int LATEST_REVISION = 32;
38 private static final String CREATE_DB_SQL = "create_db";
40 private final Application mContext;
42 public MobileLedgerDatabase(Application context) {
43 super(context, DB_NAME, null, LATEST_REVISION);
44 debug("db", "creating helper instance");
46 super.setWriteAheadLoggingEnabled(true);
50 public void onCreate(SQLiteDatabase db) {
51 debug("db", "onCreate called");
52 applyRevisionFile(db, CREATE_DB_SQL);
56 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
57 debug("db", "onUpgrade called");
58 for (int i = oldVersion + 1; i <= newVersion; i++) applyRevision(db, i);
61 private void applyRevision(SQLiteDatabase db, int rev_no) {
62 String rev_file = String.format(Locale.US, "sql_%d", rev_no);
64 applyRevisionFile(db, rev_file);
66 private void applyRevisionFile(SQLiteDatabase db, String rev_file) {
67 final Resources rm = mContext.getResources();
68 int res_id = rm.getIdentifier(rev_file, "raw", mContext.getPackageName());
70 throw new SQLException(String.format(Locale.US, "No resource for %s", rev_file));
71 db.beginTransaction();
72 try (InputStream res = rm.openRawResource(res_id)) {
73 debug("db", "Applying " + rev_file);
74 InputStreamReader isr = new InputStreamReader(res);
75 BufferedReader reader = new BufferedReader(isr);
79 while ((line = reader.readLine()) != null) {
80 if (line.startsWith("--")) {
92 throw new RuntimeException(
93 String.format("Error applying %s, line %d", rev_file, line_no), e);
98 db.setTransactionSuccessful();
100 catch (IOException e) {
101 Log.e("db", String.format("Error opening raw resource for %s", rev_file));