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<?php |
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namespace Vectorface\SnappyRouter\Handler; |
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use \Exception; |
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use Vectorface\SnappyRouter\Config\Config; |
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use Vectorface\SnappyRouter\Di\Di; |
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use Vectorface\SnappyRouter\Di\DiProviderInterface; |
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use Vectorface\SnappyRouter\Di\ServiceProvider; |
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use Vectorface\SnappyRouter\Encoder\NullEncoder; |
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use Vectorface\SnappyRouter\Exception\PluginException; |
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/** |
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* The base class for all handlers. |
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* @copyright Copyright (c) 2014, VectorFace, Inc. |
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* @author Dan Bruce <[email protected]> |
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*/ |
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abstract class AbstractHandler implements DiProviderInterface |
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{ |
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/** An array of handler-specific options */ |
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protected $options; |
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/** A sorted array of handler plugins */ |
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private $plugins; |
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/** The service provider to use */ |
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private $serviceProvider; |
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/** |
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* Constructor for the class. |
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* @param array $options An array of options for the plugin. |
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*/ |
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public function __construct($options) |
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{ |
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$this->options = $options; |
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$this->plugins = array(); |
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if (isset($options[Config::KEY_PLUGINS])) { |
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$this->setPlugins((array)$options[Config::KEY_PLUGINS]); |
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} |
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// configure the service provider |
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$services = array(); |
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if (isset($options[Config::KEY_CONTROLLERS])) { |
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$services = (array)$options[Config::KEY_CONTROLLERS]; |
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} |
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$this->serviceProvider = new ServiceProvider($services); |
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if (isset($options[Config::KEY_NAMESPACES])) { |
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// namespace provisioning |
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$this->serviceProvider->setNamespaces((array)$options[Config::KEY_NAMESPACES]); |
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} elseif (isset($options[Config::KEY_FOLDERS])) { |
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// folder provisioning |
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$this->serviceProvider->setFolders((array)$options[Config::KEY_FOLDERS]); |
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} |
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} |
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/** |
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* Performs the actual routing. |
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* @return mixed Returns the result of the route. |
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*/ |
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abstract public function performRoute(); |
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/** |
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* Retrieve an element from the DI container. |
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* @param string $key The DI key. |
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* @param boolean $useCache (optional) An optional indicating whether we |
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* should use the cached version of the element (true by default). |
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* @return mixed Returns the DI element mapped to that key. |
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*/ |
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public function get($key, $useCache = true) |
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{ |
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return Di::getDefault()->get($key, $useCache); |
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} |
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/** |
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* Sets an element in the DI container for the specified key. |
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* @param string $key The DI key. |
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* @param mixed $element The DI element to store. |
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* @return Di Returns the Di instance. |
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*/ |
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public function set($key, $element) |
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{ |
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return Di::getDefault()->set($key, $element); |
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} |
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/** |
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* Returns the active service provider for this handler. |
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* @return ServiceProvider The active service provider for this handler. |
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*/ |
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public function getServiceProvider() |
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{ |
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return $this->serviceProvider; |
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} |
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/** |
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* Returns the array of plugins registered with this handler. |
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*/ |
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public function getPlugins() |
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{ |
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return $this->plugins; |
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} |
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/** |
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* Sets the current list of plugins. |
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* @param array $plugins The array of plugins. |
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* @return AbstractHandler Returns $this. |
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*/ |
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public function setPlugins($plugins) |
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{ |
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$this->plugins = array(); |
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foreach ($plugins as $key => $plugin) { |
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$pluginClass = $plugin; |
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if (is_array($plugin)) { |
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if (!isset($plugin[Config::KEY_CLASS])) { |
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throw new PluginException('Invalid or missing class for plugin '.$key); |
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} elseif (!class_exists($plugin[Config::KEY_CLASS])) { |
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throw new PluginException('Invalid or missing class for plugin '.$key); |
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} |
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$pluginClass = $plugin[Config::KEY_CLASS]; |
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} |
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$options = array(); |
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if (isset($plugin[Config::KEY_OPTIONS])) { |
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$options = (array)$plugin[Config::KEY_OPTIONS]; |
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} |
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$this->plugins[] = new $pluginClass($options); |
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} |
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$this->plugins = $this->sortPlugins($this->plugins); |
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return $this; |
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} |
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// sorts the list of plugins according to their execution order |
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private function sortPlugins($plugins) |
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{ |
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usort($plugins, function ($a, $b) { |
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return $a->getExecutionOrder() - $b->getExecutionOrder(); |
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}); |
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return $plugins; |
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} |
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/** |
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* Invokes the plugin hook against all the listed plugins. |
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* @param string $hook The hook to invoke. |
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* @param array $args The arguments to pass to the call. |
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*/ |
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public function invokePluginsHook($hook, $args) |
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{ |
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foreach ($this->getPlugins() as $plugin) { |
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if (method_exists($plugin, $hook)) { |
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call_user_func_array(array($plugin, $hook), $args); |
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} |
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} |
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} |
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/** |
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* Returns whether a handler should function in a CLI environment. |
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* @return bool Returns true if the handler should function in a CLI |
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* environment and false otherwise. |
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*/ |
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abstract public function isCliHandler(); |
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/** |
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* Returns the active response encoder. |
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* @return EncoderInterface Returns the response encoder. |
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*/ |
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public function getEncoder() |
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{ |
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return new NullEncoder(); |
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} |
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/** |
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* Provides the handler with an opportunity to perform any last minute |
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* error handling logic. The returned value will be serialized by the |
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* handler's encoder. |
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* @param Exception $e The exception that was thrown. |
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* @return Returns a serializable value that will be encoded and returned |
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* to the client. |
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*/ |
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public function handleException(Exception $e) |
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{ |
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return $e->getMessage(); |
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} |
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/** |
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* Returns the array of options. |
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* @return array $options The array of options. |
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*/ |
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public function getOptions() |
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{ |
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return $this->options; |
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} |
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} |
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