Class Loaders

java.lang.Object

Loaders

public class Loaders
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	GROCERY_FILE_IO_ERROR_MSG
static java.lang.String	OUTPUT_FILENAME
static java.lang.String	RECIPE_FILE_IO_ERROR_MSG

Constructor Summary

Constructors

Constructor and Description
Loaders()

Method Summary

Modifier and Type	Method and Description
static GroceryList	loadGroceriesFromFile(java.lang.String filename) 1.
static RecipeList	loadRecipesFromFile(java.lang.String filename) 1.
static void	write(GroceryList groceries, java.lang.String filename) Write the GroceryList items to the specified file.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GROCERY_FILE_IO_ERROR_MSG

public static final java.lang.String GROCERY_FILE_IO_ERROR_MSG

See Also:

Constant Field Values

RECIPE_FILE_IO_ERROR_MSG

public static final java.lang.String RECIPE_FILE_IO_ERROR_MSG

See Also:

Constant Field Values

OUTPUT_FILENAME

public static final java.lang.String OUTPUT_FILENAME

See Also:

Constant Field Values

Constructor Detail

Loaders

public Loaders()

Method Detail

loadGroceriesFromFile

public static GroceryList loadGroceriesFromFile(java.lang.String filename)
                                         throws java.io.IOException

1. Load groceries from file, each line of the file indicates an ingredient and its quantity. 2. Each ingredient is in the format of "name : quantity", the number of spaces between name, colon and quantity can be any. And there may be leading and trailing spaces in a line. 3. Name of ingredient may have duplicate, this means there may be multiple lines with the same ingredient name. If names are duplicated, their quantities should be summed up. 4. If a line does not match the above mentioned format, ignore this line. 5. If an IOException happens, print GROCERY_FILE_IO_ERROR_MSG, and throw the exception.

Parameters:

filename - The name of the file that contains the list of ingredients for the grocery.

Returns:

A grocery list that includes all of the ingredients that were were properly read from the file.

Throws:

java.io.IOException

loadRecipesFromFile

public static RecipeList loadRecipesFromFile(java.lang.String filename)
                                      throws java.io.IOException

1. Load recipes from file, each line of the file indicates a recipe. 2. Each recipe is in the format "name -> ingredient1-name: ingredient1-quantity, ingredient2-name: ingredient2-quantity" 3. The number of ingredients in a recipe can be any. 4. The number of spaces between name and quantity can be any, and there may be leading and trailing spaces. 5. For simplicity, names of recipes will not have duplication, names of ingredients in a recipe will not have duplication, the format of the recipe is guaranteed to be correct. 6. Names of ingredients might not be in GroceryList, this means you need to buy this ingredient if you want to use this recipe. 7. If an IOException happens, print RECIPE_FILE_IO_ERROR_MSG, and throw the exception.

Parameters:

filename - The name of a file containing recipe information.

Returns:

A recipe list containing the recipes read from the named file.

Throws:

java.io.IOException

write

public static void write(GroceryList groceries,
                         java.lang.String filename)

Write the GroceryList items to the specified file.

Parameters:

the - grocery list of ingredients

the - name of the file to write them to.