public ILoggerRepository CreateRepository()

in src/log4net/Core/DefaultRepositorySelector.cs [360:431]
46 lines of code
7 McCabe index (conditional complexity)

		public ILoggerRepository CreateRepository(string repositoryName, Type repositoryType)
		{
			if (repositoryName == null)
			{
				throw new ArgumentNullException("repositoryName");
			}

			// If the type is not set then use the default type
			if (repositoryType == null)
			{
				repositoryType = m_defaultRepositoryType;
			}

			lock(this)
			{
				ILoggerRepository rep = null;

				// First check that the repository does not exist
				rep = m_name2repositoryMap[repositoryName] as ILoggerRepository;
				if (rep != null)
				{
					throw new LogException("Repository [" + repositoryName + "] is already defined. Repositories cannot be redefined.");
				}
				else
				{
					// Lookup an alias before trying to create the new repository
					ILoggerRepository aliasedRepository = m_alias2repositoryMap[repositoryName] as ILoggerRepository;
					if (aliasedRepository != null)
					{
						// Found an alias

						// Check repository type
						if (aliasedRepository.GetType() == repositoryType)
						{
							// Repository type is compatible
							LogLog.Debug(declaringType, "Aliasing repository [" + repositoryName + "] to existing repository [" + aliasedRepository.Name + "]");
							rep = aliasedRepository;

							// Store in map
							m_name2repositoryMap[repositoryName] = rep;
						}
						else
						{
							// Invalid repository type for alias
							LogLog.Error(declaringType, "Failed to alias repository [" + repositoryName + "] to existing repository ["+aliasedRepository.Name+"]. Requested repository type ["+repositoryType.FullName+"] is not compatible with existing type [" + aliasedRepository.GetType().FullName + "]");

							// We now drop through to create the repository without aliasing
						}
					}

					// If we could not find an alias
					if (rep == null)
					{
						LogLog.Debug(declaringType, "Creating repository [" + repositoryName + "] using type [" + repositoryType + "]");

						// Call the no arg constructor for the repositoryType
						rep = (ILoggerRepository)Activator.CreateInstance(repositoryType);

						// Set the name of the repository
						rep.Name = repositoryName;

						// Store in map
						m_name2repositoryMap[repositoryName] = rep;

						// Notify listeners that the repository has been created
						OnLoggerRepositoryCreatedEvent(rep);
					}
				}

				return rep;
			}
		}