Services/Utilities/classes/class.ilSaxController.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilSaxController
{
        protected $default_handler = null;
        protected $element_handlers = array();
        protected $handlers_in_use = array();
                
        public function __construct()
        {
                
        }
        
        public function setHandlers($a_xml_parser)
        {
                xml_set_object($a_xml_parser,$this);
                xml_set_element_handler($a_xml_parser,'handlerBeginTag','handlerEndTag');
                xml_set_character_data_handler($a_xml_parser,'handlerCharacterData');
                return;
        }
        
        public function setDefaultElementHandler(ilSaxSubsetParser $a_default_parser)
        {
                $this->default_handler = $a_default_parser;
        }
        
        public function setElementHandler(ilSaxSubsetParser $a_parser,$a_element)
        {
                $this->element_handlers[$a_element] = $a_parser;
                $this->handlers_in_use[$a_element] = false;
        }
        
        public function handlerBeginTag($a_xml_parser,$a_name,$a_attribs)
        {
                if(isset($this->element_handlers[$a_name]) or $this->handler_in_use)
                {
                        if(!$this->handler_in_use)
                        {
                                $this->handler_in_use = $this->element_handlers[$a_name];
                        }
                        // Forward to handler
                        $this->current_handler = $this->handler_in_use;
                        return $this->current_handler->handlerBeginTag($a_xml_parser,$a_name,$a_attribs);
                }
                // Call default handler
                $this->handler_in_use = false;
                $this->current_handler = $this->default_handler;
                return $this->default_handler->handlerBeginTag($a_xml_parser,$a_name,$a_attribs);
        }
        
        function handlerEndTag($a_xml_parser,$a_name)
        {
                if(isset($this->element_handlers[$a_name]))
                {
                        $this->handler_in_use = false;
                        $this->current_handler = $this->element_handlers[$a_name];
                        return $this->element_handlers[$a_name]->handlerEndTag($a_xml_parser,$a_name);
                }
                elseif($this->handler_in_use)
                {
                        $this->current_handler = $this->handler_in_use;
                        return $this->current_handler->handlerEndTag($a_xml_parser,$a_name);
                }
                $this->handler_in_use = false;
                $this->current_handler = $this->default_handler;
                return $this->default_handler->handlerEndTag($a_xml_parser,$a_name);
        }

        function handlerCharacterData($a_xml_parser,$a_data)
        {
                return $this->current_handler->handlerCharacterData(a_xml_parser,$a_data);
        }
        
}
?>