public function getCurrentItems() {
		if ($this->_currentItems === null) {
			$offset = $this->_itemsPerPage * $this->_currentPage - $this->_itemsPerPage;
			
			$this->_currentItems = $this->getAdapter()->getItems($offset, $this->_itemsPerPage);
			
			if (! $this->_currentItems instanceof Traversable) {
				throw new RuntimeException('Data from an adapter must implement the "Traversable" interface');
			}
		}
		
		return $this->_currentItems;
	}