OSID - osid.billing.PeriodList Service Interface Definition

Interface	osid.billing.PeriodList
Implements	`osid.OsidList`
Used By	`osid.billing.PeriodBusinessSession`
	`osid.billing.PeriodLookupSession`
	`osid.billing.PeriodQuerySession`
	`osid.billing.PeriodSearchResults`
Description	Like all `OsidLists`, `PeriodList` provides a means for accessing `Period` elements sequentially either one at a time or many at a time. Examples: while (pl.hasNext()) { Period period = pl.getNextPeriod(); } or while (pl.hasNext()) { Period[] periods = pl.getNextPeriods(pl.available()); }
Method	getNextPeriod
Description	Gets the next `Period` in this list.
Return	`osid.billing.Period`		the next `Period` in this list. The `hasNext()` method should be used to test that a next `Period` is available before calling this method.
Errors	ILLEGAL_STATE		no more elements available in this list
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getNextPeriods
Description	Gets the next set of `Period` elements in this list. The specified amount must be less than or equal to the return from `available()`.
Parameters	`cardinal`	`n`	the number of `Period` elements requested which must be less than or equal to `available()`
Return	`osid.billing.Period[]`		an array of `Period` elements. The length of the array is less than or equal to the number specified.
Errors	ILLEGAL_STATE		no more elements available in this list
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.