A lot more improvements:

[addressbook-lib.git] / Addressbook / src / org / mxchange / addressbook / database / backend / BaseDatabaseBackend.java

diff --git a/Addressbook/src/org/mxchange/addressbook/database/backend/BaseDatabaseBackend.java b/Addressbook/src/org/mxchange/addressbook/database/backend/BaseDatabaseBackend.java
index b992e61370e66e2756989aa7a85f191199682b63..5a666916c965629d72585ab3e468091666882da3 100644 (file)
--- a/Addressbook/src/org/mxchange/addressbook/database/backend/BaseDatabaseBackend.java
+++ b/Addressbook/src/org/mxchange/addressbook/database/backend/BaseDatabaseBackend.java
@@ -16,7 +16,12 @@
  */
 package org.mxchange.addressbook.database.backend;
 
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.text.MessageFormat;
+import java.util.Enumeration;
 import org.mxchange.addressbook.BaseFrameworkSystem;
+import org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException;
 
 /**
  * Generall database backend
@@ -30,4 +35,52 @@ public class BaseDatabaseBackend extends BaseFrameworkSystem {
         */
        protected BaseDatabaseBackend () {
        }
+
+       /**
+        * Validates driver name and throws an exception if the driver is not valid
+        *
+        * @param driverName Driver name (e.g. "mysql")
+        * @throws org.mxchange.addressbook.exceptions.UnsupportedDatabaseDriverException If the given driver name cannot be solved into a driver instance
+        */
+       protected void validateDriver (final String driverName) throws UnsupportedDatabaseDriverException {
+               // Trace message
+               this.getLogger().trace(MessageFormat.format("driverName={0} - CALLED!", driverName)); //NOI18N
+
+               // Try to find the driver in driver list
+               Enumeration<Driver> drivers = DriverManager.getDrivers();
+
+               // Default is not found
+               boolean isFound = false;
+
+               // Search for it
+               while (drivers.hasMoreElements()) {
+                       // Get element
+                       Driver driver = drivers.nextElement();
+
+                       // Debug message
+                       this.getLogger().debug(MessageFormat.format("Driver {0} is installed.", driver)); //NOI18N
+
+                       // Get class name
+                       String className = driver.getClass().getName();
+
+                       // Is this wanted?
+                       if (className.contains(driverName)) {
+                               // Debug message
+                               this.getLogger().debug("Found driver!"); //NOI18N
+
+                               // Found it
+                               isFound = true;
+                               break;
+                       }
+               }
+
+               // Is it found?
+               if (!isFound) {
+                       // Throw exception
+                       throw new UnsupportedDatabaseDriverException(driverName);
+               }
+
+               // Trace message
+               this.getLogger().trace("EXIT!"); //NOI18N
+       }
 }