Addressbook/src/org/mxchange/addressbook/database/backend/BaseDatabaseBackend.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.backend;
  18
  19 import java.sql.Driver;
  20 import java.sql.DriverManager;
  21 import java.text.MessageFormat;
  22 import java.util.Enumeration;
  23 import org.mxchange.addressbook.BaseFrameworkSystem;
  24 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException;
  25
  26 /**
  27  * Generall database backend
  28  *
  29  * @author Roland Haeder
  30  */
  31 public class BaseDatabaseBackend extends BaseFrameworkSystem {
  32
  33         /**
  34          * No instances from this class
  35          */
  36         protected BaseDatabaseBackend () {
  37         }
  38
  39         /**
  40          * Validates driver name and throws an exception if the driver is not valid
  41          *
  42          * @param driverName Driver name (e.g. "mysql")
  43          * @throws org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException If the given driver name cannot be solved into a driver instance
  44          */
  45         protected void validateDriver (final String driverName) throws UnsupportedDatabaseDriverException {
  46                 // Trace message
  47                 this.getLogger().trace(MessageFormat.format("driverName={0} - CALLED!", driverName)); //NOI18N
  48
  49                 // Try to find the driver in driver list
  50                 Enumeration<Driver> drivers = DriverManager.getDrivers();
  51
  52                 // Default is not found
  53                 boolean isFound = false;
  54
  55                 // Search for it
  56                 while (drivers.hasMoreElements()) {
  57                         // Get element
  58                         Driver driver = drivers.nextElement();
  59
  60                         // Debug message
  61                         this.getLogger().debug(MessageFormat.format("Driver {0} is installed.", driver)); //NOI18N
  62
  63                         // Get class name
  64                         String className = driver.getClass().getName();
  65
  66                         // Is this wanted?
  67                         if (className.contains(driverName)) {
  68                                 // Debug message
  69                                 this.getLogger().debug("Found driver!"); //NOI18N
  70
  71                                 // Found it
  72                                 isFound = true;
  73                                 break;
  74                         }
  75                 }
  76
  77                 // Is it found?
  78                 if (!isFound) {
  79                         // Throw exception
  80                         throw new UnsupportedDatabaseDriverException(driverName);
  81                 }
  82
  83                 // Trace message
  84                 this.getLogger().trace("EXIT!"); //NOI18N
  85         }
  86 }