<?
/** classit.inc *
* iterator for classes created *
* by classgen.php requires *
* MySQL-XML */

/** @author Brandon Niemczyk */

class classit {

	var $current_obj;
	var $parent_id;							// parent id number
	var $object_type;						// string storing the type of object
	var $doc_id;							// document id
	
	var $obj_array = array();				// complete array of objects
	var $nviewed_stack = array();			// stack of objects (not viewed)
	var $viewed_stack = array();			// stack of objects (viewed)
	
	/** generator requires type of object and *
	* the document id  **/
	function classit($type, $document) {
		$this->object_type = $type;
		$this->doc_id = $document;
		
		// become the doc in doc
		$doc = new DOCUMENT();
		$doc->become($this->doc_id);
		
		// get obj_array from document
		$this->obj_array = $doc->search_elements("xmlobjtype", $this->object_type);
		
		// copy to nviewed stack (sort first)
		sort ($this->obj_array);
		// we reverse it so that we don't lose the correct order with pop/push
		$this->nviewed_stack = array_reverse($this->obj_array);
	}
	
	/** get next object */
	function next() {
		// we can't go to next if there is nothing there!
		if(count($this->nviewed_stack) < 1) return false;
		
		// put current in viewed
		if(isset($this->current_obj->id))
			array_push($this->viewed_stack, $this->current_obj->id);
		
		// create current this is where things get trick
		// we have to generate the code (figure out obj type)
		// and then run it
		$code = "\$this->current_obj = new $this->object_type;";
		eval($code);
		$this->current_obj->become(array_pop($this->nviewed_stack));
		
		// set the parent id number
		if(isset($this->current_obj->parent))
			$this->parent_id = $this->current_obj->parent;
		
		// return current_obj
		return $this->current_obj;
	}
	
	/** get previous object */
	function previous() {
		// we can't go to previous if there is nothing there
		if(count($this->viewed_stack) < 1) return false;
		
		// put current in nviewed, there should always be a current
		array_push($this->nviewed_stack, $this->current_obj->id);
		
		// create the current TRICKY AGAIN ;)
		$code = "\$this->current_obj = new $this->object_type;";
		eval($code);
		$this->current_obj->become(array_pop($this_viewed_stack));
		
		// set the parent
		if(isset($this->current_obj->parent))
			$this->parent_id = $this->current_obj->parent;
		
		// return current_obj
		return $current_obj;
	}
	
	/** this class is not complete I need to add some *
	* search functions to it **/
}