/home/edulekha/studygroup.edulekha.com/ow_libraries/wideimage/MapperFactory.php
<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package WideImage
**/
/**
* Thrown when image format isn't supported
*
* @package Exceptions
*/
class WideImage_UnsupportedFormatException extends WideImage_Exception {}
/**
* Mapper factory
*
* @package Internals
**/
abstract class WideImage_MapperFactory
{
static protected $mappers = array();
static protected $customMappers = array();
static protected $mimeTable = array(
'image/jpg' => 'JPEG',
'image/jpeg' => 'JPEG',
'image/pjpeg' => 'JPEG',
'image/gif' => 'GIF',
'image/png' => 'PNG'
);
/**
* Returns a mapper, based on the $uri and $format
*
* @param string $uri File URI
* @param string $format File format (extension or mime-type) or null
* @return WideImage_Mapper
**/
static function selectMapper($uri, $format = null)
{
$format = self::determineFormat($uri, $format);
if (array_key_exists($format, self::$mappers))
return self::$mappers[$format];
$mapperClassName = 'WideImage_Mapper_' . $format;
if (!class_exists($mapperClassName, false))
{
$mapperFileName = WideImage::path() . 'Mapper/' . $format . '.php';
if (file_exists($mapperFileName))
require_once $mapperFileName;
}
if (class_exists($mapperClassName))
{
self::$mappers[$format] = new $mapperClassName();
return self::$mappers[$format];
}
throw new WideImage_UnsupportedFormatException("Format '{$format}' is not supported.");
}
static function registerMapper($mapper_class_name, $mime_type, $extension)
{
self::$customMappers[$mime_type] = $mapper_class_name;
self::$mimeTable[$mime_type] = $extension;
}
static function getCustomMappers()
{
return self::$customMappers;
}
static function determineFormat($uri, $format = null)
{
if ($format == null)
$format = self::extractExtension($uri);
// mime-type match
if (preg_match('~[a-z]*/[a-z-]*~i', $format))
if (isset(self::$mimeTable[strtolower($format)]))
{
return self::$mimeTable[strtolower($format)];
}
// clean the string
$format = strtoupper(preg_replace('/[^a-z0-9_-]/i', '', $format));
if ($format == 'JPG')
$format = 'JPEG';
return $format;
}
static function mimeType($format)
{
return array_search(strtoupper($format), self::$mimeTable);
}
static function extractExtension($uri)
{
$p = strrpos($uri, '.');
if ($p === false)
return '';
else
return substr($uri, $p + 1);
}
}