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<?php |
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/** |
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* Message.php |
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* |
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* @copyright More in license.md |
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* @license http://www.ipublikuj.eu |
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* @author Adam Kadlec http://www.ipublikuj.eu |
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* @package iPublikuj:FlashMessages! |
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* @subpackage Entities |
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* @since 1.0.0 |
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* |
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* @date 06.02.15 |
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*/ |
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namespace IPub\FlashMessages\Entities; |
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use Nette; |
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use Nette\Localization; |
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use IPub; |
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use IPub\FlashMessages\Adapters; |
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use IPub\FlashMessages\Exceptions; |
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/** |
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* Flash message entity |
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* |
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* @package iPublikuj:FlashMessages! |
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* @subpackage Entities |
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* |
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* @author Adam Kadlec <[email protected]> |
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*/ |
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class Message extends Nette\Object implements IMessage |
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{ |
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const LEVEL_INFO = 'info'; |
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const LEVEL_SUCCESS = 'success'; |
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const LEVEL_WARNING = 'warning'; |
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const LEVEL_ERROR = 'error'; |
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/** |
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* @var string |
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*/ |
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protected $message; |
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/** |
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* @var string |
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*/ |
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protected $level; |
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/** |
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* @var string |
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*/ |
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protected $title; |
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/** |
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* @var bool |
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*/ |
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protected $overlay = FALSE; |
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/** |
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* @var bool |
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*/ |
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protected $displayed = FALSE; |
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/** |
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* @var Localization\ITranslator |
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*/ |
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protected $translator; |
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/** |
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* @var Adapters\IPhraseAdapter |
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*/ |
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protected $phraseAdapter; |
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/** |
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* @var Adapters\IPhraseAdapter |
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*/ |
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protected $titlePhraseAdapter; |
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/** |
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* @param Localization\ITranslator $translator |
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* @param Adapters\IPhraseAdapter $phraseAdapter |
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* @param Adapters\IPhraseAdapter $titlePhraseAdapter |
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*/ |
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public function __construct( |
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Localization\ITranslator $translator = NULL, |
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Adapters\IPhraseAdapter $phraseAdapter, |
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Adapters\IPhraseAdapter $titlePhraseAdapter = NULL |
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) { |
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$this->translator = $translator; |
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$this->phraseAdapter = $phraseAdapter; |
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$this->titlePhraseAdapter = $titlePhraseAdapter; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setMessage($message) |
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{ |
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if ($this->isUnserialized()) { |
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$this->message = $message; |
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} else { |
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$this->phraseAdapter->setMessage($message); |
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$this->message = NULL; |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMessage() |
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{ |
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if ($this->message === NULL && $this->translator) { |
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$this->message = $this->phraseAdapter->translate($this->translator); |
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} |
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return $this->message; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setLevel($level) |
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{ |
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$this->level = $level; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getLevel() |
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{ |
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return $this->level; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function info() |
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{ |
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$this->setLevel(self::LEVEL_INFO); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function success() |
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{ |
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$this->setLevel(self::LEVEL_SUCCESS); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function warning() |
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{ |
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$this->setLevel(self::LEVEL_WARNING); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function error() |
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{ |
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$this->setLevel(self::LEVEL_ERROR); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setTitle($title = NULL) |
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{ |
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if ($this->isUnserialized()) { |
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$this->title = $title; |
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} else { |
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if ($this->titlePhraseAdapter instanceof Adapters\IPhraseAdapter) { |
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$this->titlePhraseAdapter->setMessage($title); |
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} |
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$this->title = NULL; |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getTitle() |
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{ |
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if ($this->title === NULL && $this->translator && $this->titlePhraseAdapter instanceof Adapters\IPhraseAdapter) { |
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$this->title = $this->titlePhraseAdapter->translate($this->translator); |
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} |
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return $this->title; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setOverlay($overlay) |
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{ |
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$this->overlay = (bool) $overlay; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getOverlay() |
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{ |
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return $this->overlay; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setParameters(array $parameter) |
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{ |
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$this->validateState(__FUNCTION__); |
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$this->phraseAdapter->setParameters($parameter); |
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$this->message = NULL; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setCount($count) |
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{ |
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$this->validateState(__FUNCTION__); |
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$this->phraseAdapter->setCount($count); |
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$this->message = NULL; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setDisplayed($displayed = TRUE) |
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{ |
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$this->displayed = (bool) $displayed; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isDisplayed() |
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{ |
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return $this->displayed === TRUE ? TRUE : FALSE; |
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} |
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/** |
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* @param string $method |
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* |
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* @throws Exceptions\InvalidStateException |
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*/ |
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private function validateState($method) |
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{ |
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if ($this->isUnserialized()) { |
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throw new Exceptions\InvalidStateException("You cannot call method $method on unserialized Entities\\Message object"); |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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private function isUnserialized() |
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{ |
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return $this->translator === NULL; |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return $this->level . ' ' . ($this->title ? $this->title . ' ' : '') . $this->getMessage(); |
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} |
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/** |
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* @return array |
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*/ |
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public function __sleep() |
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{ |
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$this->message = $this->getMessage(); |
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return ['message', 'level', 'title', 'overlay', 'displayed']; |
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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.