package at.gv.egovernment.moa.spss.server.iaik.config;

import iaik.pki.store.revocation.archive.ArchiveConfiguration;
import iaik.pki.store.revocation.archive.ArchiveParameter;
import iaik.pki.store.revocation.archive.ArchiveTypes;

import java.sql.Driver;
import java.sql.DriverManager;
import java.util.Enumeration;

import at.gv.egovernment.moa.spss.server.config.ConfigurationProvider;

/**
 * An implementation of the <code>ArchiveConfiguration</code> interface
 * using configuration data provided by the MOA configuration file.
 * 
 * @see iaik.pki.store.revocation.archive.ArchiveConfiguration
 * @author Patrick Peck
 * @version $Id$
 */
public class ArchiveConfigurationImpl
  extends AbstractObservableConfiguration
  implements ArchiveConfiguration {
    
  /** The configuration parameters of the archive. */
  private ArchiveParameter archiveParameters;

  /**
   * Create a new <code>ArchiveConfigurationImpl</code>.
   * 
   * @param config The MOA configuration from which the configuration data is
   * being read.
   */
  public ArchiveConfigurationImpl(ConfigurationProvider config) {
    String jdbcUrl =
      config.getGenericConfiguration(
        ConfigurationProvider.DATABASE_ARCHIVE_PARAMETER_URL_PROPERTY);

    if (jdbcUrl != null) {
      this.archiveParameters = new DataBaseArchiveParameterImpl(jdbcUrl);
    }
    
    // Register JDBC driver class specified in generic configuration parameters
    String jdbcDriverClass = config.getGenericConfiguration(
      ConfigurationProvider.DATABASE_ARCHIVE_PARAMETER_DRIVERCLASS_PROPERTY);
    if (jdbcDriverClass != null)
    {
      try
      {
        Class.forName(jdbcDriverClass);
      }
      catch (ClassNotFoundException e)
      {
        // TODO 20030709 GK Improve exception handling
        throw new RuntimeException("JDBC driver class \"" + jdbcDriverClass + " could not be found.");       
      }
      
      Enumeration regDrivers = DriverManager.getDrivers();
      boolean isRegistered = false;
      while (regDrivers.hasMoreElements())
      {
        Object currentDriver = regDrivers.nextElement();
        if (jdbcDriverClass.equals(currentDriver.getClass().getName())) isRegistered = true;
      }
      if (!isRegistered)
      {
        // Workaround for a driver which does not register itselve at invocation of Class.forName(drvname)
        try
        {
          DriverManager.registerDriver((Driver)Class.forName(jdbcDriverClass).newInstance()); 
        }
        catch (Exception e)
        {
          // TODO 20030709 GK Improve exception handling
          throw new RuntimeException("Registering JDBC driver \"" + jdbcDriverClass + " failed.");       
        }
      }
    }
  }

  /**
   * Return the type of archive.
   * 
   * This will always return <code>ArchiveTypes.DATABASE</code>.
   * @return <code>ArchiveTypes.DATABASE</code>.
   * @see iaik.pki.store.revocation.archive.ArchiveConfiguration#getType()
   */
  public String getType() {
    return ArchiveTypes.DATABASE;
  }

  /**
   * Return the <code>ArchiveParameters</code> describing this
   * <code>ArchiveConfiguration</code>.
   * 
   * @return The archive parameters.
   * @see iaik.pki.store.revocation.archive.ArchiveConfiguration#getArchiveParameters()
   */
  public ArchiveParameter getArchiveParameters() {
    return archiveParameters;
  }

}