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gyro/core/controller/base/renderer/rendererchain.cls.php

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<?php
/**
 * Delegates rendering to a chain of IRenderDecorators
 *
 * @author Gerd Riesselmann
 * @ingroup Controller
 */
class RendererChain implements IRenderer {
        /**
         * Page data 
         *
         * @var PageData
         */
        protected $page_data = null; 
        
        /**
         * Root of Chain of IRenderDecorators
         *
         * @var IRenderDecorator
         */
        protected $chain_root = null;
        
        /**
         * Constuctor  
         *
         * @param PageData $page_data
         * @param array $arr_decorators Array of IRenderDecorators
         */     
        public function __construct($page_data, $arr_decorators) {
                $this->page_data = $page_data;
                $this->chain_root = new RenderDecoratorBase(); // Ensure there is at least somethin
                foreach($arr_decorators as $decorator) {
                        if ($decorator instanceof IRenderDecorator) {
                                $this->chain_root->append($decorator);
                        }       
                }
        }
        
        /**
         * Renders what should be rendered
         *
         * @param int $policy 
         * @return string The rendered content
         */
        public function render($policy = self::NONE) {
                $this->chain_root->initialize($this->page_data);
                return $this->chain_root->render_page($this->page_data, $this->chain_root, $policy);
        }
}

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