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 org.mxchange.addressbook.BaseFrameworkSystem;
  20 import org.mxchange.addressbook.database.backend.DatabaseBackend;
  21 import org.mxchange.addressbook.database.backend.csv.Base64CsvDatabaseBackend;
  22 import org.mxchange.addressbook.database.backend.mysql.MySqlDatabaseBackend;
  23 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseBackendException;
  24 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException;
  25
  26 /**
  27  * General database frontend class
  28  *
  29  * @author Roland Haeder
  30  */
  31 public class BaseDatabaseFrontend extends BaseFrameworkSystem {
  32
  33         /**
  34          * Instance for database backend
  35          */
  36         private DatabaseBackend backend;
  37
  38         /**
  39          * No instances from this class
  40          */
  41         protected BaseDatabaseFrontend () {
  42         }
  43
  44         /**
  45          * Instance for database backend
  46          *
  47          * @return the backend
  48          */
  49         protected final DatabaseBackend getBackend () {
  50                 return this.backend;
  51         }
  52
  53         /**
  54          * Instance for database backend
  55          *
  56          * @param backend the backend to set
  57          */
  58         protected final void setBackend (final DatabaseBackend backend) {
  59                 this.backend = backend;
  60         }
  61
  62         /**
  63          * Initialize backend
  64          *
  65          * @throws org.mxchange.addressbook.exceptions.UnsupportedDatabaseBackendException If the backend is not supported
  66          */
  67         protected void initBackend () throws UnsupportedDatabaseBackendException {
  68                 // Trace message
  69                 this.getLogger().trace("CALLED!"); //NOI18N
  70
  71                 // Read property
  72                 // @TODO rewrite this to own properties file
  73                 String backendType = System.getProperty("org.mxchange.addressbook.database.backendType", "base64csv"); //NOI18N
  74
  75                 // Try it
  76                 try {
  77                         // Switch on backend type
  78                         switch (backendType) {
  79                                 case "mysql": // MySQL backend, this requires more information //NOI18N
  80                                         this.backend = new MySqlDatabaseBackend(this.getTableName());
  81                                         break;
  82
  83                                 case "base64csv": // BASE64-encoded CSV rows //NOI18N
  84                                         this.backend = new Base64CsvDatabaseBackend(this.getTableName());
  85                                         break;
  86
  87                                 default: // Unsupported
  88                                         throw new UnsupportedDatabaseBackendException(backendType);
  89                         }
  90
  91                         // Try to run a connect on it
  92                         this.backend.connectToDatabase();
  93                 } catch (final UnsupportedDatabaseDriverException ex) {
  94                         // Continue to throw
  95                         throw new UnsupportedDatabaseBackendException(backendType, ex);
  96                 }
  97
  98                 // Trace message
  99                 this.getLogger().trace("EXIT!"); //NOI18N
 100         }
 101 }