/**

  * - Digitalis Internal Framework v2.0 - (C) 2007, Digitalis Informatica. Distribuicao e Gestao de Informatica, Lda.

  * Estrada de Paco de Arcos num.9 - Piso -1 2780-666 Paco de Arcos Telefone: (351) 21 4408990 Fax: (351) 21 4408999

  * http://www.digitalis.pt

  */

 package pt.digitalis.dif.ioc;

 import pt.digitalis.dif.startup.DIFStartupConfiguration;

 import pt.digitalis.utils.ioc.IIoCRegistry;

 import pt.digitalis.utils.ioc.IoCImplementations;

 import pt.digitalis.utils.ioc.exception.IoCException;

 import pt.digitalis.utils.ioc.guice.IoCRegistryGuiceImpl;

 /**

  * This class represents a wrapper class for the real registry implementation. Since we cant use IoC to abstract us from

  * the IoC implementation we wish to use, we will use this Facade class to get to the real implementation. The registry

  * is created with the proper implementation according to the default core dif configuration.

  * 

  * @author Pedro Viegas <a href="mailto:pviegas@digitalis.pt">pviegas@digitalis.pt</a>

  * @created Oct 2, 2007

  */

 final public class DIFIoCRegistry {

     /** IIoCRegistry instance */

     private static IIoCRegistry instance;

     /**

      * Getter for the Singleton instance of {@link IIoCRegistry}

      * 

      * @return the registry instance

      */

     static public IIoCRegistry getRegistry()

     {

         if (instance == null)

             if (IoCImplementations.GUICE.equals(DIFStartupConfiguration.getIoCImplementation()))

             {

                 try

                 {

                     instance = IoCRegistryGuiceImpl.getRegistry(DIFStartupConfiguration.getModuleParser());

                 }

                 catch (IoCException iocException)

                 {

                     throw new RuntimeException("Could not find a valid IoC registry! Unable to proceed...",

                             iocException);

                 }

             }

             else

                 throw new RuntimeException("Unsupported IoC: \"" + DIFStartupConfiguration.getIoCImplementation()

                         + "\"\n" + "Check DIF configuration.");

         return instance;

     }

     /**

      * Enforce noninstantiability

      */

     private DIFIoCRegistry()

     {}

 }