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gyro/core/controller/base/renderdecorators/renderdecoratorbase.cls.php

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<?php
/**
 * Default implementation if IRenderDecorator
 *  
 * @author Gerd Riesselmann
 * @ingroup Controller
 */
class RenderDecoratorBase implements IRenderDecorator {
        /**
         * Next RenderDecorator
         *
         * @var IRenderDecorator
         */
        private $next = null;
        
        /**
         * Add a new decorator to end of decorator chain
         *
         * @param IRenderDecorator $decorator
         * @return void
         */
        public function append($decorator) {
                $next = $this->get_next();
                if ($next) {
                        $next->append($decorator);
                }
                else {
                        $this->next = $decorator;
                }
        }
        
        /**
         * Return next renderer in chain
         *
         * @return IRenderDecorator
         */
        public function get_next() {
                return $this->next;
        }
        
        /**
         * Initialize this decorator and the data passed
         *
         * @param PageData $page_data
         * @return void
         */
        public function initialize($page_data) {
                $this->initialize_next($page_data);
        }

        /**
         * Initialize next decorator in chain
         *
         * @param PageData $page_data
         * @return void
         */
        protected function initialize_next($page_data) {
                $next = $this->get_next();
                if ($next) {
                        $next->initialize($page_data);
                }
        }

        /**
         * Render content
         *
         * @param PageData $page_data
         * @return void
         */
        public function render_content($page_data) {
                $this->render_content_next($page_data);
        }
        
        /**
         * Render content
         *
         * @param PageData $page_data
         * @return void
         */
        protected function render_content_next($page_data) {
                $next = $this->get_next();
                if ($next) {
                        $next->render_content($page_data);
                }
        }
                
        /**
         * Render page
         *
         * @param PageData $page_data
         * @param IRenderDecorator Decorator to invoke render_content upon
         * @param int $policy If set to IView::DISPLAY, content is printed, if false it is returned only
         * @return void
         */
        public function render_page($page_data, $content_render_decorator, $policy = IView::NONE) {
                return $this->render_page_next($page_data, $content_render_decorator, $policy);
        }
        
        /**
         * Call render_page() on next decorator
         *
         * @param PageData $page_data
         * @param IRenderDecorator Decorator to invoke render_content upon
         * @param int $policy If set to IView::DISPLAY, content is printed, if false it is returned only
         * @return string The rendered content
         */
        protected function render_page_next($page_data, $content_render_decorator, $policy = IView::NONE) {
                $next = $this->get_next();
                if ($next) {
                        return $next->render_page($page_data, $content_render_decorator, $policy);
                }
        }
}

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