class CategorizerService {

	public List<Transaction> categorize(List<Transaction> transactions) {
		checkNotNull(transactions);
		ImmutableList.Builder<Transaction> builder = ImmutableList.builder();
		for (Transaction transaction : transactions) {
			builder.add(categorize(transaction));
		}
		return builder.build();
	}

	@Inject  CategorizerService(CategoriesService categoriesService);

}