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.

<?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);
    }
}

<?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.

If you have any questions or issues, please feel free to post to the Documentation Forum.

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