Interface ExpenseRepository

All Known Implementing Classes:

MongoExpenseRepository

public interface ExpenseRepository

Interface used for dealing with storage and retrieval of expense

Method Summary

Modifier and Type	Method	Description
Optional<Expense>	changeExpense(int id, BigDecimal newAmount)	Changes the expense with given ID
Optional<Expense>	getExpense(int id)	Finds the expense with given id
List<Expense>	getExpenses()	Finds all the expenses saved
Expense	saveExpense(Expense expense)	Saves the expense to storage

Method Details

saveExpense

@Nullable
Expense saveExpense(@NonNull
 Expense expense)

Saves the expense to storage

Parameters:

expense - Expense saved

Returns:

expense saved

getExpense

Optional<Expense> getExpense(int id)

Finds the expense with given id

Parameters:

id - ID as shown by showExpenses

Returns:

Expense if found else empty

getExpenses

@NonNull
List<Expense> getExpenses()

Finds all the expenses saved

Returns:

List of all the expenses saved

changeExpense

Optional<Expense> changeExpense(int id,
 @NonNull
 BigDecimal newAmount)

Changes the expense with given ID

Parameters:

id - ID identifying the expense. It is the left value displayed when calling showExpenses

newAmount - Will update the value to this value. If set to zero. The expanse will be removed

Returns:

Changed expense or empty if did not change