BusinessResult implementation in PHP

BusinessResult.php

<?php


class BusinessResult
{
    public const SUCCESS = "success";

    public const FAIL = "fail";

    private string $result;

    public ?string $message;

    /**
     * @var mixed|null
     */
    private $value;

    /**
     * BusinessResult constructor.
     * @param string $result
     * @param string|null $message
     * @param $value
     */
    private function __construct(string $result, ?string $message, $value)
    {
        $this->value = $value;
        $this->message = $message;
        $this->result = $result;
    }

    public function getValue()
    {
        return $this->value;
    }

    public static function success($value): BusinessResult
    {
        return new BusinessResult(self::SUCCESS, null, $value);
    }

    public static function fail(string $message): BusinessResult
    {
        return new BusinessResult(self::FAIL, $message, null);
    }

    public function isSuccess(): bool
    {
        return $this->result === self::SUCCESS;
    }

    public function isFail(): bool
    {
        return $this->result === self::FAIL;
    }

    public function onSuccess(callable $func): BusinessResult
    {
        if ($this->isSuccess()) {
            $result = $func($this->value);

            return $result instanceof self
                ? $result : self::success($result);
        }

        return $this;
    }

    public function onSuccessAction(callable $action): BusinessResult
    {
        if ($this->isSuccess()) {
            $action($this->value);
        }

        return $this;
    }

    public function onFailure(callable $func): BusinessResult
    {
        if ($this->isFail()) {
            $result = $func($this->message);

            return $result instanceof self
                ? $result
                : self::fail($result);
        }

        return $this;
    }

    public function onFailureAction(callable $action): BusinessResult
    {
        if ($this->isFail()) {
            $action($this->message);
        }

        return $this;
    }

    public function onEither(callable $func)
    {
        return $func($this);
    }
}