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<?php |
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/** |
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* Tools to use API as ActiveRecord for Yii2 |
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* |
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* @link https://github.com/hiqdev/yii2-hiart |
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* @package yii2-hiart |
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* @license BSD-3-Clause |
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* @copyright Copyright (c) 2015-2017, HiQDev (http://hiqdev.com/) |
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*/ |
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namespace hiqdev\hiart; |
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abstract class AbstractRequest implements RequestInterface |
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{ |
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/** |
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* @var string response implementation to be specified in concrete implementation |
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*/ |
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protected $responseClass; |
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/** |
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* @var string request handler implementation to be specified in concrete implementation |
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*/ |
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protected $handlerClass; |
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/** |
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* @var QueryBuilderInterface |
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*/ |
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protected $builder; |
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/** |
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* @var Query |
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*/ |
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protected $query; |
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/** |
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* @var string Connection name |
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*/ |
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protected $dbname; |
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/** |
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* @var array request method |
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*/ |
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protected $method; |
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protected $uri; |
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protected $headers = []; |
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protected $body; |
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protected $version; |
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protected $isBuilt; |
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protected $parts = []; |
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protected $fullUri; |
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abstract public function send($options = []); |
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public function __construct(QueryBuilderInterface $builder, Query $query) |
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{ |
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$this->builder = $builder; |
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$this->query = $query; |
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} |
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public function getDbname() |
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{ |
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return $this->dbname; |
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} |
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public function getMethod() |
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{ |
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return $this->method; |
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} |
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public function getUri() |
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{ |
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return $this->uri; |
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} |
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public function getFullUri() |
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{ |
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if ($this->fullUri === null) { |
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$this->fullUri = $this->createFullUri(); |
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} |
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return $this->fullUri; |
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} |
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public function createFullUri() |
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{ |
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return ($this->isFullUri($this->uri) ? '' : $this->getDb()->getBaseUri()) . $this->uri; |
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} |
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public function isFullUri($uri) |
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{ |
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return preg_match('/^https?:\\/\\//i', $uri); |
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} |
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public function getHeaders() |
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{ |
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return $this->headers; |
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} |
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public function getBody() |
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{ |
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return $this->body; |
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} |
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public function getVersion() |
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{ |
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return $this->version; |
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} |
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/** |
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* @return Query |
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*/ |
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public function getQuery() |
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{ |
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return $this->query; |
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} |
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protected function build() |
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{ |
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if ($this->isBuilt === null) { |
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if (!empty($this->query)) { |
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$this->updateFromQuery(); |
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} |
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$this->isBuilt = true; |
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} |
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} |
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protected function updateFromQuery() |
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{ |
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$this->builder->prepare($this->query); |
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$this->buildDbname(); |
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$this->buildAuth(); |
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$this->buildMethod(); |
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$this->buildUri(); |
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$this->buildQueryParams(); |
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$this->buildHeaders(); |
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$this->buildBody(); |
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$this->buildFormParams(); |
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$this->buildProtocolVersion(); |
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} |
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protected function buildDbname() |
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{ |
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$this->dbname = $this->getDb()->name; |
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} |
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protected function buildAuth() |
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{ |
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$this->builder->buildAuth($this->query); |
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} |
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protected function buildMethod() |
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{ |
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$this->method = $this->builder->buildMethod($this->query) ?: 'GET'; |
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} |
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protected function buildUri() |
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{ |
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$this->uri = $this->builder->buildUri($this->query); |
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} |
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protected function buildQueryParams() |
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{ |
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$params = $this->builder->buildQueryParams($this->query); |
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if (is_array($params)) { |
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$params = http_build_query($params, '', '&'); |
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} |
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if (!empty($params)) { |
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$this->uri .= '?' . $params; |
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} |
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} |
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protected function buildHeaders() |
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{ |
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$this->headers = $this->builder->buildHeaders($this->query); |
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if (empty($this->headers['User-Agent'])) { |
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$this->headers['User-Agent'] = $this->prepareUserAgent(); |
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} |
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} |
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protected function buildBody() |
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{ |
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$this->body = $this->builder->buildBody($this->query); |
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} |
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protected function buildFormParams() |
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{ |
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$this->setFormParams($this->builder->buildFormParams($this->query)); |
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} |
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protected function setFormParams($params) |
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{ |
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if (!empty($params)) { |
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$this->body = is_array($params) ? http_build_query($params, '', '&') : $params; |
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$this->headers['Content-Type'] = 'application/x-www-form-urlencoded'; |
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} |
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} |
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protected function buildProtocolVersion() |
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{ |
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$this->version = $this->builder->buildProtocolVersion($this->query) ?: '1.1'; |
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} |
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public function serialize() |
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{ |
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return serialize($this->getParts()); |
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} |
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public function unserialize($string) |
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{ |
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foreach (unserialize($string) as $key => $value) { |
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$this->{$key} = $value; |
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} |
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} |
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public function getParts() |
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{ |
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if (empty($this->parts)) { |
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$this->build(); |
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foreach (['dbname', 'method', 'uri', 'headers', 'body', 'version'] as $key) { |
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$this->parts[$key] = $this->{$key}; |
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} |
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} |
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return $this->parts; |
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} |
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public function isRaw() |
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{ |
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return !empty($this->query->options['raw']); |
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} |
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protected function getHandler() |
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{ |
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$handler = $this->getDb()->getHandler(); |
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if ($handler === null) { |
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$handler = $this->createHandler(); |
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} |
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return $handler; |
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} |
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protected function createHandler() |
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{ |
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$config = $this->prepareHandlerConfig($this->getDb()->config); |
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return new $this->handlerClass($config); |
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} |
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protected function prepareHandlerConfig($config) |
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{ |
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return $config; |
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} |
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protected function prepareUserAgent() |
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{ |
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return $this->getDb()->getUserAgent(); |
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} |
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/** |
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* @return AbstractConnection|ConnectionInterface |
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*/ |
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public function getDb() |
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{ |
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return isset($this->builder) ? $this->builder->db : AbstractConnection::getDb($this->dbname); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.