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 $DIC;
        $ilPluginAdmin = $DIC['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;
    }
}