Value objects
In the previous section, we created our first value object, PostId. Before continuing on, we have a couple of other value objects to create: Title and Content. To keep it simple, we will have them extend a base value object, Qubus\ValueObjects\StringLiteral\StringLiteral and add a new fromString method.
Title
<?php
use Qubus\Exception\Data\TypeException;
use Qubus\ValueObjects\StringLiteral\StringLiteral;
final class Title extends StringLiteral
{
/**
* @throws TypeException
*/
public static function fromString(string $title): self
{
return new self(value: $title);
}
}
Content
<?php
use Qubus\Exception\Data\TypeException;
use Qubus\ValueObjects\StringLiteral\StringLiteral;
final class Content extends StringLiteral
{
/**
* @throws TypeException
*/
public static function fromString(string $content): self
{
return new self(value: $content);
}
}
StringLiteral has other methods to be aware of:
<?php
/**
* Returns a String object given a PHP native string as parameter.
*
* @param string $value
* @return StringLiteral|ValueObject
*/
public static function fromNative(): ValueObject;
/**
* Returns the value of the string.
*/
public function toNative(): string;
/**
* Tells whether two strings are equal by comparing their values
*
* @param ValueObject $string
*/
public function equals(ValueObject $stringLiteral): bool;
/**
* Tells whether the String is empty
*/
public function isEmpty(): bool;
Both Title and Content inherit the above methods.
