class.ilRendererFactory.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once("./Services/Preview/classes/class.ilPreview.php");

final class ilRendererFactory
{
        private static $renderers = null;
        
        public static function getRenderers()
        {
                self::loadAvailableRenderers();
                return self::$renderers;
        }
        
        public static function getRenderer($preview)
        {
                $renderers = self::getRenderers();
                
                // check each renderer if it supports that preview object
                foreach ($renderers as $renderer)
                {
                        if ($renderer->supports($preview))      
                        {
                                return $renderer;
                        }                       
                }
                
                // no matching renderer was found
                return null;
        }
        
        private static function loadAvailableRenderers()
        {
                // already loaded?
                if (self::$renderers != null)
                        return;
                
                $r = array();
                
                // get registered and active plugins
                global $ilPluginAdmin;
                $pl_names = $ilPluginAdmin->getActivePluginsForSlot(IL_COMP_SERVICE, "Preview", "pvre");
                foreach ($pl_names as $pl)
                {
                        $plugin = ilPluginAdmin::getPluginObject(IL_COMP_SERVICE, "Preview", "pvre", $pl);
                        $r[] = $plugin->getRendererClassInstance();     
                }
                
                // add default renderers
                include_once("./Services/Preview/classes/class.ilImageMagickRenderer.php");
                $r[] = new ilImageMagickRenderer();
                
                include_once("./Services/Preview/classes/class.ilGhostscriptRenderer.php");
                if (ilGhostscriptRenderer::isGhostscriptInstalled())
                        $r[] = new ilGhostscriptRenderer();
                
                self::$renderers = $r;
        }
}
?>