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<?php |
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/* |
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* This file is part of the PHP Translation package. |
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* |
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* (c) PHP Translation team <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Translation\Common\Model; |
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final class Message implements MessageInterface |
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{ |
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/** |
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* @var string |
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* |
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* The domain the message belongs to |
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*/ |
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private $domain; |
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/** |
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* @var string |
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* |
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* The key/phrase you write in the source code |
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*/ |
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private $key; |
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/** |
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* @var string |
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* |
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* The locale the translations is on |
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*/ |
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private $locale; |
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/** |
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* @var string |
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* |
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* The translated string. This is the preview of the message. Ie no placeholders is visible. |
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*/ |
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private $translation; |
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/** |
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* Key value array with metadata. |
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* |
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* @var array |
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*/ |
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private $meta = []; |
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public function __construct(string $key, string $domain = '', string $locale = '', string $translation = '', array $meta = []) |
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{ |
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$this->key = $key; |
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$this->domain = $domain; |
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$this->locale = $locale; |
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$this->translation = $translation; |
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$this->meta = $meta; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getDomain(): string |
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{ |
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return $this->domain; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function withDomain(string $domain): MessageInterface |
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{ |
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$new = clone $this; |
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$new->domain = $domain; |
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return $new; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getKey(): string |
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{ |
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return $this->key; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getLocale(): string |
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{ |
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return $this->locale; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function withLocale(string $locale): MessageInterface |
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{ |
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$new = clone $this; |
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$new->locale = $locale; |
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return $new; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getTranslation(): string |
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{ |
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return $this->translation; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function withTranslation(string $translation): MessageInterface |
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{ |
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$new = clone $this; |
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$new->translation = $translation; |
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return $new; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getAllMeta(): array |
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{ |
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return $this->meta; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function withMeta(array $meta): MessageInterface |
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{ |
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$new = clone $this; |
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$new->meta = $meta; |
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return $new; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function withAddedMeta(string $key, string $value): MessageInterface |
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{ |
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$new = clone $this; |
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$new->meta[$key] = $value; |
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return $new; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMeta(string $key, $default = null) |
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{ |
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if (\array_key_exists($key, $this->meta)) { |
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return $this->meta[$key]; |
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} |
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return $default; |
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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.