Addressbook/src/org/mxchange/addressbook/database/frontend/BaseDatabaseFrontend.java

   1 /*
   2  * Copyright (C) 2015 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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 for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.addressbook.database.frontend;
  18
  19 import java.sql.SQLException;
  20 import org.mxchange.addressbook.BaseFrameworkSystem;
  21 import org.mxchange.addressbook.database.backend.DatabaseBackend;
  22 import org.mxchange.addressbook.database.backend.csv.Base64CsvDatabaseBackend;
  23 import org.mxchange.addressbook.database.backend.mysql.MySqlDatabaseBackend;
  24 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseBackendException;
  25 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException;
  26
  27 /**
  28  * General database frontend class
  29  *
  30  * @author Roland Haeder
  31  */
  32 public abstract class BaseDatabaseFrontend extends BaseFrameworkSystem implements DatabaseFrontend {
  33
  34         /**
  35          * Instance for database backend
  36          */
  37         private DatabaseBackend backend;
  38
  39         /**
  40          * No instances from this class
  41          */
  42         protected BaseDatabaseFrontend () {
  43         }
  44
  45         /**
  46          * Instance for database backend
  47          *
  48          * @return the backend
  49          */
  50         protected final DatabaseBackend getBackend () {
  51                 return this.backend;
  52         }
  53
  54         /**
  55          * Instance for database backend
  56          *
  57          * @param backend the backend to set
  58          */
  59         protected final void setBackend (final DatabaseBackend backend) {
  60                 this.backend = backend;
  61         }
  62
  63         /**
  64          * Initialize backend
  65          *
  66          * @throws org.mxchange.addressbook.exceptions.UnsupportedDatabaseBackendException If the backend is not supported
  67          * @throws java.sql.SQLException If a SQL database backend fails to connect
  68          */
  69         protected void initBackend () throws UnsupportedDatabaseBackendException, SQLException {
  70                 // Trace message
  71                 this.getLogger().trace("CALLED!"); //NOI18N
  72
  73                 // Read property
  74                 // @TODO rewrite this to own properties file
  75                 String backendType = this.getProperty("database.backendType"); //NOI18N
  76
  77                 // Try it
  78                 try {
  79                         // Switch on backend type
  80                         switch (backendType) {
  81                                 case "mysql": // MySQL backend, this requires more information //NOI18N
  82                                         this.backend = new MySqlDatabaseBackend(this.getTableName());
  83                                         break;
  84
  85                                 case "base64csv": // BASE64-encoded CSV rows //NOI18N
  86                                         this.backend = new Base64CsvDatabaseBackend(this.getTableName(), this);
  87                                         break;
  88
  89                                 default: // Unsupported
  90                                         throw new UnsupportedDatabaseBackendException(backendType);
  91                         }
  92
  93                         // Try to run a connect on it
  94                         this.backend.connectToDatabase();
  95                 } catch (final UnsupportedDatabaseDriverException ex) {
  96                         // Continue to throw
  97                         throw new UnsupportedDatabaseBackendException(backendType, ex);
  98                 }
  99
 100                 // Trace message
 101                 this.getLogger().trace("EXIT!"); //NOI18N
 102         }
 103 }