-/*
- * Copyright © 2018 Damyan Ivanov.
- * This file is part of Mobile-Ledger.
- * Mobile-Ledger is free software: you can distribute it and/or modify it
- * under the term of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your opinion), any later version.
- *
- * Mobile-Ledger is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License terms for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
- */
-
-package net.ktnx.mobileledger.utils;
-
-import android.content.Context;
-import android.content.res.Resources;
-import android.database.Cursor;
-import android.database.SQLException;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteOpenHelper;
-import android.util.Log;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.util.Locale;
-
-import static net.ktnx.mobileledger.utils.MLDB.DatabaseMode.READ;
-import static net.ktnx.mobileledger.utils.MLDB.DatabaseMode.WRITE;
-
-public final class MLDB {
- public enum DatabaseMode {READ, WRITE}
-
- public static final String ACCOUNTS_TABLE = "accounts";
- public static final String DESCRIPTION_HISTORY_TABLE = "description_history";
- private static MobileLedgerDatabase helperForReading, helperForWriting;
-
- public static synchronized SQLiteDatabase getDatabase(Context context, DatabaseMode mode) {
- if (mode == READ) {
- if (helperForReading == null) helperForReading = new MobileLedgerDatabase(context);
- return helperForReading.getReadableDatabase();
- }
- else {
- if (helperForWriting == null) helperForWriting = new MobileLedgerDatabase(context);
- return helperForWriting.getWritableDatabase();
- }
- }
- public static SQLiteDatabase getReadableDatabase(Context context) {
- return getDatabase(context, READ);
- }
- public static SQLiteDatabase getWritableDatabase(Context context) {
- return getDatabase(context, WRITE);
- }
- static public int get_option_value(Context context, String name, int default_value) {
- String s = get_option_value(context, name, String.valueOf(default_value));
- try {
- return Integer.parseInt(s);
- }
- catch (Exception e) {
- Log.d("db", "returning default int value of " + name, e);
- return default_value;
- }
- }
-
- static public long get_option_value(Context context, String name, long default_value) {
- String s = get_option_value(context, name, String.valueOf(default_value));
- try {
- return Long.parseLong(s);
- }
- catch (Exception e) {
- Log.d("db", "returning default long value of " + name, e);
- return default_value;
- }
- }
-
- static public String get_option_value(Context context, String name, String default_value) {
- Log.d("db", "about to fetch option " + name);
- try (SQLiteDatabase db = getReadableDatabase(context)) {
- try (Cursor cursor = db
- .rawQuery("select value from options where name=?", new String[]{name}))
- {
- if (cursor.moveToFirst()) {
- String result = cursor.getString(0);
-
- if (result == null) result = default_value;
-
- Log.d("db", "option " + name + "=" + result);
- return result;
- }
- else return default_value;
- }
- catch (Exception e) {
- Log.d("db", "returning default value for " + name, e);
- return default_value;
- }
- }
- }
-
- static public void set_option_value(Context context, String name, String value) {
- Log.d("db", "setting option " + name + "=" + value);
- try (SQLiteDatabase db = getWritableDatabase(context)) {
- db.execSQL("insert or replace into options(name, value) values(?, ?);",
- new String[]{name, value});
- }
- }
-
- static public void set_option_value(Context context, String name, long value) {
- set_option_value(context, name, String.valueOf(value));
- }
-}
-
-class MobileLedgerDatabase extends SQLiteOpenHelper implements AutoCloseable {
- public static final String DB_NAME = "mobile-ledger.db";
- public static final int LATEST_REVISION = 8;
-
- private final Context mContext;
-
- public MobileLedgerDatabase(Context context) {
- super(context, DB_NAME, null, LATEST_REVISION);
- Log.d("db", "creating helper instance");
- mContext = context;
- super.setWriteAheadLoggingEnabled(true);
- }
-
- @Override
- public void onCreate(SQLiteDatabase db) {
- Log.d("db", "onCreate called");
- onUpgrade(db, -1, LATEST_REVISION);
- }
-
- @Override
- public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
- Log.d("db", "onUpgrade called");
- for (int i = oldVersion + 1; i <= newVersion; i++) applyRevision(db, i);
- }
-
- private void applyRevision(SQLiteDatabase db, int rev_no) {
- final Resources rm = mContext.getResources();
- String rev_file = String.format(Locale.US, "sql_%d", rev_no);
-
- int res_id = rm.getIdentifier(rev_file, "raw", mContext.getPackageName());
- if (res_id == 0) throw new SQLException(
- String.format(Locale.US, "No resource for revision %d", rev_no));
- db.beginTransaction();
- try (InputStream res = rm.openRawResource(res_id)) {
- Log.d("db", "Applying revision " + String.valueOf(rev_no));
- InputStreamReader isr = new InputStreamReader(res);
- BufferedReader reader = new BufferedReader(isr);
-
- String line;
- while ((line = reader.readLine()) != null) {
- db.execSQL(line);
- }
-
- db.setTransactionSuccessful();
- }
- catch (IOException e) {
- Log.e("db", String.format("Error opening raw resource for revision %d", rev_no));
- e.printStackTrace();
- }
- finally {
- db.endTransaction();
- }
- }
-}