import java.io.*;

/**
 * This interface declares a method for obtaining a product catalog
 * from a file.
 *
 * @author 張維
 * @version 1.0.0
 * @see Catalog
 */
public interface CatalogLoader  {

	/*
	 * Loads the information in the specified file into a product
	 * catalog and returns the catalog.
	 *
	 * @param filename  The name of a file that contains catalog information.
	 * @return a product catalog.
	 * @throws FileNotFoundException  if the specified file does not exist.
	 * @throws IOException if there is an error reading the information in the specified file.
	 * @throws DataFormatException if the file contains badly-formed data.
	 */
	Catalog loadCatalog(String fileName) 
	 throws FileNotFoundException, IOException, DataFormatException;
}