php新特性之“接口”

<?php
/**
 * 演示代码：php新特性之“接口”
 */
namespace test;
interface Documentable {
	public function getId();
	public function getContent();
}

class StreamDocument implements Documentable {
	protected $resource;
	protected $buffer;
	public function __construct($resource, $buffer = 4096) {
		$this->resource = $resource;
		$this->buffer = $buffer;
	}
	
	public function getId() {
		return 'resource-' . (int)$this->resource;
	}
	
	public function getContent() {
		$streamContent = '';
		rewind($this->resource);
		while (feof($this->resource) === false) {
			$streamContent .= fread($this->resource, $this->buffer);
		}
		return $streamContent;
	}
}

class HtmlDocument implements Documentable {
	protected $url;
	public function __construct($url) {
		$this->url = $url;
	}
	
	public function getId() {
		return $this->url;
	}
	
	public function getContent() {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $this->url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
		curl_setopt($ch, CURLOPT_MAXREDIRS, 3);
		$html = curl_exec($ch);
		curl_close($ch);
		return $html;
	}
}

class DocumentStore {
	protected $data = [];
	public function addDocument(Documentable $document) {
		$key = $document->getId();
		$value = $document->getContent();
		$this->data[$key] = $value;
	}
	public function getDocuments() {
		return $this->data;
	}
}


function test() {
	$document_store = new \test\DocumentStore();
	$resource = @fopen('test.txt', 'r');
	if (false === $resource) {
		exit('no suche file: test.txt');
	}
	$stream_document = new \test\StreamDocument($resource);
	$document_store->addDocument($stream_document);
	$url = 'http://www.baidu.com';
	$html_document = new \test\HtmlDocument($url);
	$document_store->addDocument($html_document);

	$data = $document_store->getDocuments();

	var_dump($data);
}

test();