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<?php |
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/** |
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* Smart image resizing (and manipulation) by url module for Zend Framework 3 |
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* |
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* @link http://github.com/tck/zf2-imageresizer for the canonical source repository |
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* @copyright Copyright (c) 2017 Tobias Knab |
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* |
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* For the full copyright and license information, please view the LICENSE.txt |
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* file that was distributed with this source code. |
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*/ |
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namespace TckImageResizer\Service; |
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use TckImageResizer\Exception\BadMethodCallException; |
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/** |
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* self defined command registry |
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* |
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* @package TckImageResizer |
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*/ |
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class CommandRegistry |
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{ |
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/** |
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* singleton |
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*/ |
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private static $instance = null; |
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/** |
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* the actual commands |
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* |
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* @var array |
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*/ |
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protected $commands = []; |
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/** |
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* private constructor |
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*/ |
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private function __construct() |
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{ |
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} |
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/** |
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* get singleton instance |
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* |
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* @return self |
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*/ |
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public static function getInstance() |
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{ |
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if (!self::$instance instanceof self) { |
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self::$instance = new self; |
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} |
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return self::$instance; |
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} |
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/** |
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* clear the singleton |
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* |
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* @return void |
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*/ |
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public static function destroy() |
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{ |
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self::$instance = null; |
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} |
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/** |
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* get command registry list |
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* |
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* @return array |
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*/ |
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public static function getCommands() |
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{ |
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$instance = self::getInstance(); |
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return $instance->commands; |
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} |
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/** |
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* command registry has command |
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* |
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* @param string $command |
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* |
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* @return boolean |
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*/ |
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public static function hasCommand($command) |
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{ |
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if (!is_string($command) || strlen($command) < 1) { |
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throw new BadMethodCallException('Parameter command is not a valid string'); |
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} |
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$instance = self::getInstance(); |
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return isset($instance->commands[$command]); |
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} |
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/** |
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* get command callback |
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* |
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* @param string $command |
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* |
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* @return array |
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*/ |
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public static function getCommand($command) |
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{ |
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if (!is_string($command) || strlen($command) < 1) { |
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throw new BadMethodCallException('Parameter command is not a valid string'); |
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} |
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$instance = self::getInstance(); |
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if (!isset($instance->commands[$command])) { |
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throw new BadMethodCallException('Command "' . $command . '" is not a registered command'); |
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} |
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return $instance->commands[$command]; |
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} |
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/** |
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* register a image command |
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* |
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* @param string $command |
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* @param callable $callback |
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* @return self |
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*/ |
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public static function register($command, $callback) |
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{ |
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if (!is_string($command) || strlen($command) < 1) { |
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throw new BadMethodCallException('Parameter command is not a valid string'); |
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} |
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if (!is_callable($callback)) { |
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throw new BadMethodCallException('Parameter callback is not a valid callback'); |
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} |
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$instance = self::getInstance(); |
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$instance->commands[$command] = $callback; |
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return $instance; |
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} |
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} |
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tck /
zf2-imageresizer
