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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */
/**
* Base class for sax-based expat parsing
* extended classes need to overwrite the method setHandlers and implement their own handler methods
*
*
* @author Stefan Meyer <smeyer@databay>
* @version $Id$
*
* @extends PEAR
*/
class ilSaxParser
{
/**
* XML-Content type 'file' or 'string'
* If you choose file set the filename in constructor
* If you choose 'String' call the constructor with no argument and use setXMLContent()
* @var string
* @access private
*/
var $input_type = null;
/**
* XML-Content in case of content type 'string'
* @var string
* @access private
*/
var $xml_content = '';
/**
* ilias object
* @var object ilias
* @access private
*/
var $ilias;
/**
* language object
* @var object language
* @access private
*/
var $lng;
/**
* xml filename
* @var filename
* @access private
*/
var $xml_file;
/**
* error handler which handles error messages (used if parsers are called from soap)
*
* @var boolean
*/
var $throwException = false;
/**
* Constructor
* setup ILIAS global object
* @access public
*/
function __construct($a_xml_file = '', $throwException = false)
{
global $ilias, $lng;
if($a_xml_file)
{
$this->xml_file = $a_xml_file;
$this->input_type = 'file';
}
$this->throwException = $throwException;
$this->ilias = &$ilias;
$this->lng = &$lng;
}
function setXMLContent($a_xml_content)
{
$this->xml_content = $a_xml_content;
$this->input_type = 'string';
}
function getXMLContent()
{
return $this->xml_content;
}
function getInputType()
{
return $this->input_type;
}
/**
* stores xml data in array
*
* @access private
* @throws ilSaxParserException or ILIAS Error
*/
function startParsing()
{
$xml_parser = $this->createParser();
$this->setOptions($xml_parser);
$this->setHandlers($xml_parser);
switch($this->getInputType())
{
case 'file':
$fp = $this->openXMLFile();
$this->parse($xml_parser,$fp);
break;
case 'string':
$this->parse($xml_parser);
break;
default:
$this->handleError("No input type given. Set filename in constructor or choose setXMLContent()",
$this->ilias->error_obj->FATAL);
break;
}
$this->freeParser($xml_parser);
}
/**
* create parser
*
* @access private
* @throws ilSaxParserException or ILIAS Error
*/
function createParser()
{
$xml_parser = xml_parser_create("UTF-8");
if($xml_parser == false)
{
$this->handleError("Cannot create an XML parser handle",$this->ilias->error_obj->FATAL);
}
return $xml_parser;
}
/**
* set parser options
*
* @access private
*/
function setOptions($a_xml_parser)
{
xml_parser_set_option($a_xml_parser,XML_OPTION_CASE_FOLDING,false);
}
/**
* set event handler
* should be overwritten by inherited class
* @access private
*/
function setHandlers($a_xml_parser)
{
echo 'ilSaxParser::setHandlers() must be overwritten';
}
/**
* open xml file
*
* @access private
* @throws ilSaxParserException or ILIAS Error
*/
function openXMLFile()
{
if(!($fp = fopen($this->xml_file,'r')))
{
$this->handleError("Cannot open xml file \"".$this->xml_file."\"",$this->ilias->error_obj->FATAL);
}
return $fp;
}
/**
* parse xml file
*
* @access private
* @throws ilSaxParserException or ILIAS Error
*/
function parse($a_xml_parser,$a_fp = null)
{
switch($this->getInputType())
{
case 'file':
while($data = fread($a_fp,4096))
{
$parseOk = xml_parse($a_xml_parser,$data,feof($a_fp));
}
break;
case 'string':
$parseOk = xml_parse($a_xml_parser,$this->getXMLContent());
break;
}
if(!$parseOk
&& (xml_get_error_code($a_xml_parser) != XML_ERROR_NONE))
{
$errorCode = xml_get_error_code($a_xml_parser);
$line = xml_get_current_line_number($a_xml_parser);
$col = xml_get_current_column_number($a_xml_parser);
$this->handleError("XML Parse Error: ".xml_error_string($errorCode)." at line ".$line.", col ". $col . " (Code: ".$errorCode.")" ,$this->ilias->error_obj->FATAL);
}
return true;
}
/**
* use given error handler to handle error message or internal ilias error message handle
*
* @param string $message
* @param string $code
* @throws ilSaxParserException or ILIAS Error
*/
protected function handleError($message, $code) {
if ($this->throwException) {
require_once ('./Services/Xml/exceptions/class.ilSaxParserException.php');
throw new ilSaxParserException ($message, $code);
} else {
if (is_object($this->ilias))
{
$this->ilias->raiseError($message, $code);
}
else
{
die($message);
}
}
return false;
}
/**
* free xml parser handle
*
* @access private
*/
function freeParser($a_xml_parser)
{
if(!xml_parser_free($a_xml_parser))
{
$this->ilias->raiseError("Error freeing xml parser handle ",$this->ilias->error_obj->FATAL);
}
}
/**
* set error handling
*
* @param $error_handler
*/
public function setThrowException ($throwException)
{
$this->throwException = $throwException;
}
}
?>
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