OSID - osid.billing.Entry Service Interface Definition

Interface	osid.billing.Entry
Implements	`osid.OsidRelationship`
Description	An `Entry` is a relationship between a customer and item in a billing period.
Method	getCustomerId
Description	Gets the customer `Id` associated with this entry.
Return	`osid.id.Id`		the customer `Id`
Compliance	`mandatory`		This method must be implemented.
Method	getCustomer
Description	Gets the customer associated with this entry.
Return	`osid.billing.Customer`		the customer
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getItemId
Description	Gets the item `Id` associated with this entry.
Return	`osid.id.Id`		the item `Id`
Compliance	`mandatory`		This method must be implemented.
Method	getItem
Description	Gets the item associated with this entry.
Return	`osid.billing.Item`		the item
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getPeriodId
Description	Gets the `Id` of the `Period` of this offering.
Return	`osid.id.Id`		the `Period` `Id`
Compliance	`mandatory`		This method must be implemented.
Method	getPeriod
Description	Gets the `Period` of this offering.
Return	`osid.billing.Period`		the period
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getQuantity
Description	Gets the quantity of the item.
Return	`cardinal`		the quantity
Errors	ILLEGAL_STATE		`hasProduct()` is `false`
Compliance	`mandatory`		This method is must be implemented.
Method	getAmount
Description	Gets the amount of this entry.
Return	`osid.financials.Currency`		the amount
Compliance	`mandatory`		This method must be implemented.
Method	isDebit
Description	Tests if the amount is a debit or a credit.
Return	`boolean`		`true` if this item amount is a debit, `false` if it is a credit
Compliance	`mandatory`		This method must be implemented.
Method	getEntryRecord
Description	Gets the entry record corresponding to the given `Entry` record `Type.` This method is used to retrieve an object implementing the requested record. The `entryRecordType` may be the `Type` returned in `getRecordTypes()` or any of its parents in a `Type` hierarchy where `hasRecordType(entryRecordType)` is `true` .
Parameters	`osid.type.Type`	`entryRecordType`	the type of entry record to retrieve
Return	`osid.billing.records.EntryRecord`		the entry record
Errors	NULL_ARGUMENT		`entryRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	UNSUPPORTED		`hasRecordType(entryRecordType)` is `false`
Compliance	`mandatory`		This method must be implemented.