OSID - osid.metering.UtilityList Service Interface Definition

Interface	osid.metering.UtilityList
Implements	`osid.OsidList`
Used By	`osid.metering.MeterUtilitySession`
	`osid.metering.UtilityHierarchySession`
	`osid.metering.UtilityLookupSession`
	`osid.metering.UtilityQuerySession`
	`osid.metering.UtilitySearchResults`
Description	Like all `OsidLists`, `UtilityList` provides a means for accessing `Utility` elements sequentially either one at a time or many at a time. Examples: while (ul.hasNext()) { Utility utility = ul.getNextUtility(); } or while (ul.hasNext()) { Utility[] utilities = ul.getNextUtilities(ul.available()); }
Method	getNextUtility
Description	Gets the next `Utility` in this list.
Return	`osid.metering.Utility`		the next `Utility` in this list. The `hasNext()` method should be used to test that a next `Utility` 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	getNextUtilities
Description	Gets the next set of `Utility elements` in this list. The specified amount must be less than or equal to the return from `available()`.
Parameters	`cardinal`	`n`	the number of `Utility` elements requested which must be less than or equal to `available()`
Return	`osid.metering.Utility[]`		an array of `Utility` 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.