GoF Builderパターンのサンプル

Builder.php

<?php
    class News{
        private $title;
        private $url;
        private $target_date;
        
        public function __construct($title, $url, $target_date){
            $this->title = $title;
            $this->url = $url;
            $this->target_date = $target_date;
        }
        
        public function getTitle(){
            return $this->title;
        }
        
        public function getUrl(){
            return $this->url;
        }
        
        public function getDate(){
            return $this->target_date;
        }
    }
    
    class NewsDirector{
        private $builder;
        private $url;
        
        public function __construct(NewsBuilder $builder, $url){
            $this->builder = $builder;
            $this->url = $url;
        }
        
        public function getNews(){
            $news_list = $this->builder->parse($this->url);
            return $news_list;
        }
    }
    
    interface NewsBuilder {
        public function parse($data);    
    }
    
    class RssNewsBuilder implements NewsBuilder {
        public function parse($url){
            $data = simplexml_load_file($url);
            
            if ($data === false){
                throw new Exception (
                    'read data[' . 
                    htmlspecialchars($url, ENT_QUOTES, mb_internal_encoding()) .
                    '] failed !'
                );
            }
            
            $list = array();
            foreach ($data->item as $item){
                $dc = $item->children('http://purl.org/dc/elements/1.1/');
                $list[] = new News(
                    $item->title,
                    $item->link,
                    $dc->date
                );
            }
            
            var_dump($list);
            
            return $list;
        }
    }
    
    //RSSのパース処理クラス
    $builder = new RssNewsBuilder();
    $url = "http://www.php.net/news.rss";
    
    //RSSのパース処理クラスを実行
    $director = new NewsDirector($builder, $url);
    
    //出力処理
    foreach($director->getNews() as $article){
        printf(
            '<li>[%s] <a href="%s">%s</a></li>',
            $article->getDate(),
            $article->getUrl(),
            $article->getTitle()
        );
    }