2 * Copyright © 2018 Damyan Ivanov.
3 * This file is part of Mobile-Ledger.
4 * Mobile-Ledger 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 * Mobile-Ledger 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 Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
18 package net.ktnx.mobileledger.utils;
20 import android.content.Context;
21 import android.content.res.Resources;
22 import android.database.Cursor;
23 import android.database.SQLException;
24 import android.database.sqlite.SQLiteDatabase;
25 import android.database.sqlite.SQLiteOpenHelper;
26 import android.util.Log;
28 import java.io.BufferedReader;
29 import java.io.IOException;
30 import java.io.InputStream;
31 import java.io.InputStreamReader;
32 import java.util.Locale;
34 import static net.ktnx.mobileledger.utils.MLDB.DatabaseMode.READ;
35 import static net.ktnx.mobileledger.utils.MLDB.DatabaseMode.WRITE;
37 public final class MLDB {
38 public enum DatabaseMode { READ, WRITE };
39 public static final String ACCOUNTS_TABLE = "accounts";
40 public static final String DESCRIPTION_HISTORY_TABLE = "description_history";
41 private static MobileLedgerDatabase helperForReading, helperForWriting;
43 public static synchronized SQLiteDatabase getDatabase(Context context, DatabaseMode mode) {
45 if (helperForReading == null) helperForReading = new MobileLedgerDatabase(context);
46 return helperForReading.getReadableDatabase();
49 if (helperForWriting == null) helperForWriting = new MobileLedgerDatabase(context);
50 return helperForWriting.getWritableDatabase();
53 public static SQLiteDatabase getReadableDatabase(Context context) {
54 return getDatabase(context, READ);
56 public static SQLiteDatabase getWritableDatabase(Context context) {
57 return getDatabase(context, WRITE);
59 static public int get_option_value(Context context, String name, int default_value) {
60 String s = get_option_value(context, name, String.valueOf(default_value));
62 return Integer.parseInt(s);
65 Log.d("db", "returning default int value of " + name, e);
70 static public long get_option_value(Context context, String name, long default_value) {
71 String s = get_option_value(context, name, String.valueOf(default_value));
73 return Long.parseLong(s);
76 Log.d("db", "returning default long value of " + name, e);
81 static public String get_option_value(Context context, String name, String default_value) {
82 Log.d("db", "about to fetch option " + name);
83 try (SQLiteDatabase db = getReadableDatabase(context)) {
84 try (Cursor cursor = db
85 .rawQuery("select value from options where name=?", new String[]{name}))
87 if (cursor.moveToFirst()) {
88 String result = cursor.getString(0);
90 if (result == null) result = default_value;
92 Log.d("db", "option " + name + "=" + result);
95 else return default_value;
98 Log.d("db", "returning default value for " + name, e);
104 static public void set_option_value(Context context, String name, String value) {
105 Log.d("db", "setting option " + name + "=" + value);
106 try (SQLiteDatabase db = getWritableDatabase(context)) {
107 db.execSQL("insert or replace into options(name, value) values(?, ?);",
108 new String[]{name, value});
112 static public void set_option_value(Context context, String name, long value) {
113 set_option_value(context, name, String.valueOf(value));
117 class MobileLedgerDatabase extends SQLiteOpenHelper implements AutoCloseable {
118 public static final String DB_NAME = "mobile-ledger.db";
119 public static final int LATEST_REVISION = 8;
121 private final Context mContext;
123 public MobileLedgerDatabase(Context context) {
124 super(context, DB_NAME, null, LATEST_REVISION);
125 Log.d("db", "creating helper instance");
130 public void onCreate(SQLiteDatabase db) {
131 Log.d("db", "onCreate called");
132 onUpgrade(db, -1, LATEST_REVISION);
136 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
137 Log.d("db", "onUpgrade called");
138 for (int i = oldVersion + 1; i <= newVersion; i++) applyRevision(db, i);
141 private void applyRevision(SQLiteDatabase db, int rev_no) {
142 final Resources rm = mContext.getResources();
143 String rev_file = String.format(Locale.US, "sql_%d", rev_no);
145 int res_id = rm.getIdentifier(rev_file, "raw", mContext.getPackageName());
146 if (res_id == 0) throw new SQLException(
147 String.format(Locale.US, "No resource for revision %d", rev_no));
148 db.beginTransaction();
149 try (InputStream res = rm.openRawResource(res_id)) {
150 Log.d("db", "Applying revision " + String.valueOf(rev_no));
151 InputStreamReader isr = new InputStreamReader(res);
152 BufferedReader reader = new BufferedReader(isr);
155 while ((line = reader.readLine()) != null) {
159 db.setTransactionSuccessful();
161 catch (IOException e) {
162 Log.e("db", String.format("Error opening raw resource for revision %d", rev_no));