code: @Override
  	public JdbcDatabaseDescriptor dbByName(final String dbName) {
  		Collection<H2DatabaseWorking> select = CollectionUtils.select(dbsw, new Predicate<H2DatabaseWorking>() {
  
  			@Override
  			public boolean evaluate(H2DatabaseWorking db) {
  				return dbName.equals( db.getName() );
  			}
  
  		});
  		if(CollectionUtils.size(select)==0){
  			throw new IllegalArgumentException("There are no databases called '" + dbName + "'");
  		}
  		if(CollectionUtils.size(select)>=2){
  			throw new IllegalArgumentException("More than one database is called '" + dbName + "'");
  		}
  		return CollectionUtils.extractSingleton( select );
  	}
docs: Get a database by its name.