ImageFactory.php

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<?php
class Zend_Pdf_Resource_ImageFactory
{
    public static function factory($filename) {
        if(!is_file($filename)) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception("Cannot create image resource. File not found.");
        }
        $extension = pathinfo($filename, PATHINFO_EXTENSION);
        /*
         * There are plans to use Zend_Mime and not file extension. In the mean time, if you need to
         * use an alternate file extension just spin up the right processor directly.
         */
        switch (strtolower($extension)) {
            case 'tif':
                //Fall through to next case;
            case 'tiff':
                #require_once 'Zend/Pdf/Resource/Image/Tiff.php';
                return new Zend_Pdf_Resource_Image_Tiff($filename);
                break;
            case 'png':
                #require_once 'Zend/Pdf/Resource/Image/Png.php';
                return new Zend_Pdf_Resource_Image_Png($filename);
                break;
            case 'jpg':
                //Fall through to next case;
            case 'jpe':
                //Fall through to next case;
            case 'jpeg':
                #require_once 'Zend/Pdf/Resource/Image/Jpeg.php';
                return new Zend_Pdf_Resource_Image_Jpeg($filename);
                break;
            default:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception("Cannot create image resource. File extension not known or unsupported type.");
                break;
        }
    }
}