OSID - osid.hierarchy.HierarchyList Service Interface Definition

Interface	osid.hierarchy.HierarchyList
Implements	`osid.OsidList`
Used By	`osid.hierarchy.HierarchyLookupSession`
	`osid.hierarchy.HierarchyQuerySession`
	`osid.hierarchy.HierarchySearchResults`
Description	Like all `OsidLists`, `HierarchyList` provides a means for accessing `Id` elements sequentially either one at a time or many at a time. Examples: while (hl.hasNext()) { Hierarchy hierarchy = hl.getNextHierarchy(); } or while (hl.hasNext()) { Hierarchy[] hierarchies = hl.getNextHierarchies(hl.available()); }
Method	getNextHierarchy
Description	Gets the next `Hierarchy` in this list.
Return	`osid.hierarchy.Hierarchy`		the next `Hierarchy` in this list. The `hasNext()` method should be used to test that a next `Hierarchy` 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	getNextHierarchies
Description	Gets the next set of `Hierarchy` objects in this list. The specified amount must be less than or equal to the return from `available()`.
Parameters	`cardinal`	`n`	the number of `Hierarchy` elements requested which must be less than or equal to `available()`
Return	`osid.hierarchy.Hierarchy[]`		an array of `Hierarchy` 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.