org.osid.metering

Interface UtilityList

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable, OsidList

public interface UtilityList
extends OsidList

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 Summary

Methods

Modifier and Type	Method and Description
Utility[]	getNextUtilities(long n) Gets the next set of Utility elements in this list.
Utility	getNextUtility() Gets the next Utility in this list.

Methods inherited from interface org.osid.OsidList

available, hasNext, skip

Methods inherited from interface org.osid.binding.java.OsidList

close

Methods inherited from interface java.io.Closeable

close

Method Detail

getNextUtility

Utility getNextUtility()
                       throws OperationFailedException

Gets the next Utility in this list.

Returns:

the next Utility in this list. The hasNext() method should be used to test that a next Utility is available before calling this method.

Throws:

IllegalStateException - no more elements available in this list

OperationFailedException - unable to complete request

Compliance:

mandatory - This method must be implemented.

getNextUtilities

Utility[] getNextUtilities(long n)
                           throws OperationFailedException

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:

n - the number of Utility elements requested which must be less than or equal to available()

Returns:

an array of Utility elements. The length of the array is less than or equal to the number specified.

Throws:

IllegalStateException - no more elements available in this list

OperationFailedException - unable to complete request

Compliance:

mandatory - This method must be implemented.