Source for file ItemIterator.php

<?php 
 
/**
 * ItemIterator provides access to these objects sequentially, one at a time.
 * The purpose of all Iterators is to to offer a way for OSID methods to
 * return multiple values of a common type and not use an array.  Returning an
 * array may not be appropriate if the number of values returned is large or
 * is fetched remotely.  Iterators do not allow access to values by index,
 * rather you must access values in sequence. Similarly, there is no way to go
 * backwards through the sequence unless you place the values in a data
 * structure, such as an array, that allows for access by index.
 * 
 * <p>
 * OSID Version: 2.0
 * </p>
 * 
 * <p>
 * Licensed under the {@link org.osid.SidImplementationLicenseMIT MIT}
 * O.K.I&#46; OSID Definition License}.
 * </p>
 * 
 * @package org.osid.assessment
 */
class ItemIterator
{
    /**
     * Return true if there is an additional  Item ; false otherwise.
     *  
     * @return boolean 
     * 
     * @throws object AssessmentException An exception with one of
     *          the following messages defined in
     *          org.osid.assessment.AssessmentException may be thrown:  {@link }
     *          org.osid.assessment.AssessmentException#OPERATION_FAILED
     *          OPERATION_FAILED}, {@link }
     *          org.osid.assessment.AssessmentException#PERMISSION_DENIED
     *          PERMISSION_DENIED}, {@link }
     *          org.osid.assessment.AssessmentException#CONFIGURATION_ERROR
     *          CONFIGURATION_ERROR}, {@link }
     *          org.osid.assessment.AssessmentException#UNIMPLEMENTED
     *          UNIMPLEMENTED}
     * 
     * @access public
     */
    function hasNextItem () { 
        die ("Method <b>".__FUNCTION__."()</b> declared in interface<b> ".__CLASS__."</b> has not been overloaded in a child class."); 
    } 
 
    /**
     * Return the next Item.
     *  
     * @return object Item 
     * 
     * @throws object AssessmentException An exception with one of
     *          the following messages defined in
     *          org.osid.assessment.AssessmentException may be thrown:  {@link }
     *          org.osid.assessment.AssessmentException#OPERATION_FAILED
     *          OPERATION_FAILED}, {@link }
     *          org.osid.assessment.AssessmentException#PERMISSION_DENIED
     *          PERMISSION_DENIED}, {@link }
     *          org.osid.assessment.AssessmentException#CONFIGURATION_ERROR
     *          CONFIGURATION_ERROR}, {@link }
     *          org.osid.assessment.AssessmentException#UNIMPLEMENTED
     *          UNIMPLEMENTED} Throws an exception with the message
     *          org.osid.OsidException.NO_MORE_ELEMENTS if all objects have
     *          already been returned.
     * 
     * @access public
     */
    function nextItem () { 
        die ("Method <b>".__FUNCTION__."()</b> declared in interface<b> ".__CLASS__."</b> has not been overloaded in a child class."); 
    } 
}
 
?>