app/src/main/java/net/ktnx/mobileledger/db/DB.java

   1 /*
   2  * Copyright © 2021 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.db;
  19
  20 import android.content.res.Resources;
  21 import android.database.SQLException;
  22
  23 import androidx.annotation.NonNull;
  24 import androidx.room.Database;
  25 import androidx.room.Room;
  26 import androidx.room.RoomDatabase;
  27 import androidx.room.migration.Migration;
  28 import androidx.sqlite.db.SupportSQLiteDatabase;
  29
  30 import net.ktnx.mobileledger.App;
  31 import net.ktnx.mobileledger.dao.AccountDAO;
  32 import net.ktnx.mobileledger.dao.CurrencyDAO;
  33 import net.ktnx.mobileledger.dao.OptionDAO;
  34 import net.ktnx.mobileledger.dao.TemplateAccountDAO;
  35 import net.ktnx.mobileledger.dao.TemplateHeaderDAO;
  36 import net.ktnx.mobileledger.dao.TransactionDAO;
  37
  38 import java.io.BufferedReader;
  39 import java.io.IOException;
  40 import java.io.InputStream;
  41 import java.io.InputStreamReader;
  42 import java.util.Locale;
  43 import java.util.regex.Matcher;
  44 import java.util.regex.Pattern;
  45
  46 import static net.ktnx.mobileledger.utils.Logger.debug;
  47
  48 @Database(version = DB.REVISION,
  49           entities = {TemplateHeader.class, TemplateAccount.class, Currency.class, Account.class,
  50                       Profile.class, Option.class, AccountValue.class, DescriptionHistory.class,
  51                       Transaction.class, TransactionAccount.class
  52           })
  53 abstract public class DB extends RoomDatabase {
  54     public static final int REVISION = 59;
  55     public static final String DB_NAME = "MoLe.db";
  56     private static DB instance;
  57     public static DB get() {
  58         if (instance != null)
  59             return instance;
  60         synchronized (DB.class) {
  61             if (instance != null)
  62                 return instance;
  63
  64             return instance = Room.databaseBuilder(App.instance, DB.class, DB_NAME)
  65                                   .addMigrations(new Migration[]{singleVersionMigration(17),
  66                                                                  singleVersionMigration(18),
  67                                                                  singleVersionMigration(19),
  68                                                                  singleVersionMigration(20),
  69                                                                  multiVersionMigration(20, 22),
  70                                                                  multiVersionMigration(22, 30),
  71                                                                  multiVersionMigration(30, 32),
  72                                                                  multiVersionMigration(32, 34),
  73                                                                  multiVersionMigration(34, 40),
  74                                                                  singleVersionMigration(41),
  75                                                                  multiVersionMigration(41, 58),
  76                                                                  singleVersionMigration(59)
  77                                                                  })
  78                                   .addCallback(new Callback() {
  79                                       @Override
  80                                       public void onOpen(@NonNull SupportSQLiteDatabase db) {
  81                                           super.onOpen(db);
  82                                           db.execSQL("PRAGMA foreign_keys = ON");
  83                                           db.execSQL("pragma case_sensitive_like=ON;");
  84
  85                                       }
  86                                   })
  87                                   .build();
  88         }
  89     }
  90     private static Migration singleVersionMigration(int toVersion) {
  91         return new Migration(toVersion - 1, toVersion) {
  92             @Override
  93             public void migrate(@NonNull SupportSQLiteDatabase db) {
  94                 String fileName = String.format(Locale.US, "db_%d", toVersion);
  95
  96                 applyRevisionFile(db, fileName);
  97             }
  98         };
  99     }
 100     private static Migration multiVersionMigration(int fromVersion, int toVersion) {
 101         return new Migration(fromVersion, toVersion) {
 102             @Override
 103             public void migrate(@NonNull SupportSQLiteDatabase db) {
 104                 String fileName = String.format(Locale.US, "db_%d_%d", fromVersion, toVersion);
 105
 106                 applyRevisionFile(db, fileName);
 107             }
 108         };
 109     }
 110     public static void applyRevisionFile(@NonNull SupportSQLiteDatabase db, String fileName) {
 111         final Resources rm = App.instance.getResources();
 112         int res_id = rm.getIdentifier(fileName, "raw", App.instance.getPackageName());
 113         if (res_id == 0)
 114             throw new SQLException(String.format(Locale.US, "No resource for %s", fileName));
 115
 116         try (InputStream res = rm.openRawResource(res_id)) {
 117             debug("db", "Applying " + fileName);
 118             InputStreamReader isr = new InputStreamReader(res);
 119             BufferedReader reader = new BufferedReader(isr);
 120
 121             Pattern endOfStatement = Pattern.compile(";\\s*(?:--.*)?$");
 122
 123             String line;
 124             String sqlStatement = null;
 125             int lineNo = 0;
 126             while ((line = reader.readLine()) != null) {
 127                 lineNo++;
 128                 if (line.startsWith("--"))
 129                     continue;
 130                 if (line.isEmpty())
 131                     continue;
 132
 133                 if (sqlStatement == null)
 134                     sqlStatement = line;
 135                 else
 136                     sqlStatement = sqlStatement.concat(" " + line);
 137
 138                 Matcher m = endOfStatement.matcher(line);
 139                 if (!m.find())
 140                     continue;
 141
 142                 try {
 143                     db.execSQL(sqlStatement);
 144                     sqlStatement = null;
 145                 }
 146                 catch (Exception e) {
 147                     throw new RuntimeException(
 148                             String.format("Error applying %s, line %d, statement: %s", fileName,
 149                                     lineNo, sqlStatement), e);
 150                 }
 151             }
 152
 153             if (sqlStatement != null)
 154                 throw new RuntimeException(String.format(
 155                         "Error applying %s: EOF after continuation. Line %s, Incomplete " +
 156                         "statement: %s", fileName, lineNo, sqlStatement));
 157
 158         }
 159         catch (IOException e) {
 160             throw new RuntimeException(String.format("Error opening raw resource for %s", fileName),
 161                     e);
 162         }
 163     }
 164     public abstract TemplateHeaderDAO getTemplateDAO();
 165
 166     public abstract TemplateAccountDAO getTemplateAccountDAO();
 167
 168     public abstract CurrencyDAO getCurrencyDAO();
 169
 170     public abstract AccountDAO getAccountDAO();
 171
 172     public abstract TransactionDAO getTransactionDAO();
 173
 174     public abstract OptionDAO getOptionDAO();
 175 }