Source for file MultiIteratorIterator.class.php

<?php
 
require_once(dirname(__FILE__)."/HarmoniIterator.class.php");
 
/**
 * A class for passing an arbitrary input array as an iterator.
 *
 * @package harmoni.osid_v2.shared
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: MultiIteratorIterator.class.php,v 1.4 2007/09/04 20:25:48 adamfranco Exp $
 */
class MultiIteratorIterator
    extends HarmoniIterator
{
    
    /**
     * Constructor
     * 
     * @return object 
     * @access public
     * @since 12/6/06
     */
    function MultiIteratorIterator () {
        $this->HarmoniIterator($null = null);
    }
    
    /**
     * Add a new iterator to this iterator
     * 
     * @param object Iterator $iterator 
     * @return void 
     * @access public
     * @since 5/9/06
     */
    function addIterator ( $iterator ) {
        $this->_elements[] =$iterator;
        unset($this->_count);
    }
 
    // public boolean hasNext();
    
    function hasNext() {
        for ($i = max(0, $this->_i); $i < count($this->_elements); $i++) {
            if ($this->_elements[$i]->hasNext())
                return true;
        }
        return false;
    }
 
    // public Type & next();
    
    function next() {
        for ($i = max(0, $this->_i); $i < count($this->_elements); $i++) {
            if ($this->_elements[$i]->hasNext())
                return $this->_elements[$i]->next();
            else
                $this->_i++;
        }
        throwError(new Error(SharedException::NO_MORE_ITERATOR_ELEMENTS(), get_class($this), 1));
    }
 
    /**
     * Gives the number of items in the iterator
     *
     * @return int 
     * @public
     */
     function count () {
         if (!isset($this->_count)) {
             $this->_count = 0;
             foreach ($this->_elements as $iterator)
                 $this->_count += $iterator->count();
         }
         return $this->_count;
     }
     
    /**
     * Skips the next item in the iterator
     *
     * @return void 
     * @public
     */
     function skipNext() {
         for ($i = max(0, $this->_i); $i < count($this->_elements); $i++) {
            if ($this->_elements[$i]->hasNext()) {
                $this->_elements[$i]->skipNext();
                return;
            } else
                $this->_i++;
        }
        throwError(new Error(SharedException::NO_MORE_ITERATOR_ELEMENTS(), get_class($this), 1));
     }
}
 
?>