/// <summary>
 /// Converts a SourceDefinitionEntity to a SourceDefinition.
 /// </summary>
 /// <param name="sourceDefinitionEntity">The SourceDefinitionEntity that have to be converted.</param>
 /// <returns>The sourcedefinition object.</returns>
 public SourceDefinition SourceDefinitionEntityToSourceDefinition(
     SourceDefinitionEntity sourceDefinitionEntity)
 {
     SourceDefinition sourceDefinition = new SourceDefinition();
     sourceDefinition.Id = sourceDefinitionEntity.Id;
     sourceDefinition.Name = sourceDefinitionEntity.Name;
     sourceDefinition.Description = sourceDefinitionEntity.Description;
     sourceDefinition.CreationTime = sourceDefinitionEntity.CreationTime;
     return sourceDefinition;
 }
 /// <summary>
 /// Loads the send answer plugin for the given <see cref="SourceDefinition"/>.
 /// </summary>
 /// <param name="sourceDefinition">The source definition for which the plugin needs to be loaded.</param>
 /// <returns>Returns the loaded send answer plugin.</returns>
 public ISendAnswerPlugin LoadPlugin(SourceDefinition sourceDefinition)
 {
     switch (sourceDefinition.Name)
     {
         case "Mail":                   
             return new MailSendAnswerPlugin();
         case "Facebook":
             return new FacebookSendAnswerPlugin();
         case "Twitter":
             // TODO uncomment
             // return new TwitterSendAnswerPlugin();
         default:
             throw new NotImplementedException("The provided source is not supported, so the answer couldn't be send.");
     }
 }