PHP Helpers: Factory Foundation Classes

• Version: v1.0.4
• Date: June 05 2019
• Release notes
• GitHub repository

Provides foundation factory classes and factory design pattern functionality

Installation

This library is installed via Composer. To install, use composer require pointybeard/helpers-foundation-factory or add "pointybeard/helpers-foundation-factory": "~1.0.0" to your composer.json file.

And run composer to update your dependencies:

$ curl -s http://getcomposer.org/installer | php
$ php composer.phar update

Requirements

There are no particuar requirements for this library other than PHP 7.2 or greater.

To include all the PHP Helpers packages on your project, use composer require pointybeard/helpers

Usage

Include this library in your PHP files with use pointybeard\Helpers\Foundation\Factory and extend the Factory\AbstractFactory class like so:

<?php

declare(strict_types=1);

namespace MyApp;

include __DIR__.'/vendor/autoload.php';

use pointybeard\Helpers\Foundation\Factory;

interface VehicleInterface
{
    public function name(): string;
    public function __toString(): string;
}

abstract class AbstractVehicle implements VehicleInterface
{
    public function name(): string
    {
        return (new \ReflectionClass(static::class))->getShortName();
    }
}

abstract class AbstractCar extends AbstractVehicle
{
    public function __toString(): string
    {
        return "Hi! I'm a {$this->name()}.";
    }
}

abstract class AbstractTruck extends AbstractVehicle
{
    public function __toString(): string
    {
        return "Hi! I'm a truck called {$this->name()}.";
    }
}

// Basic car
class Volvo extends AbstractCar
{
}

// Basic truck
class Mack extends AbstractTruck
{
}

// This adds a constructor which expects a model and vin number. They need
// to be passed in when CarFactory::build() is called
class Peugeot extends AbstractCar
{
    private $model;
    private $vin;

    public function __construct(string $model, string $vin)
    {
        $this->model = $model;
        $this->vin = $vin;
    }

    public function __get(string $name)
    {
        return $this->$name;
    }

    public function __toString(): string
    {
        return parent::__toString()." I am a model {$this->model} with vehicle identification number {$this->vin}";
    }
}

// a Cabbage is not a type of vehicle
class Cabbage
{
}

// Create a factory called MyApp\CarFactory
Factory\create(
    __NAMESPACE__.'\\CarFactory',
    __NAMESPACE__.'\\%s',
    __NAMESPACE__.'\\AbstractCar'
);

// Create a factory called MyApp\TruckFactory
Factory\create(
    __NAMESPACE__.'\\TruckFactory',
    __NAMESPACE__.'\\%s',
    __NAMESPACE__.'\\AbstractTruck'
);

// Create custom factory class
class PeugeotFactory extends Factory\AbstractFactory
{
    public function getTemplateNamespace(): string
    {
        return __NAMESPACE__.'\\%s';
    }

    public function getExpectedClassType(): ?string
    {
        return __NAMESPACE__.'\\Peugeot';
    }
}

$car = CarFactory::build('Volvo');
var_dump((string) $car);
// string(16) "Hi! I'm a Volvo."

$car = PeugeotFactory::build('Peugeot', '206', 'VF32HRHYF43242177');
var_dump((string) $car);
// string(88) "Hi! I'm a Peugeot. I am a model 206 with vehicle identification number VF32HRHYF43242177"

$truck = TruckFactory::build('Mack');
var_dump((string) $truck);
// string(28) "Hi! I'm a truck called Mack."

try {
    $car = PeugeotFactory::build('Volvo', 'XC60', 'YV1DZ8256C227123');
} catch (Factory\Exceptions\UnableToInstanciateConcreteClassException $ex) {
    echo 'Error: Cannot build a Volvo in the Peugeot factory!'.PHP_EOL;
}
// Error: Cannot build a Volvo in the Peugeot factory!

try {
    CarFactory::build('Suzuki');
} catch (Factory\Exceptions\UnableToInstanciateConcreteClassException $ex) {
    echo 'Error: Unable to build a Suzuki. Returned: '.$ex->getMessage().PHP_EOL;
}
// Error: Unable to build a Suzuki. Returned: Class \MyApp\Suzuki does not exist

try {
    CarFactory::build('Cabbage');
} catch (Factory\Exceptions\UnableToInstanciateConcreteClassException $ex) {
    echo 'Error: Unable to build a Cabbage. Returned: '.$ex->getMessage().PHP_EOL;
}
// Error: Unable to build a Cabbage. Returned: Class \MyApp\Cabbage is not
// of expected type \MyApp\AbstractCar

Support

If you believe you have found a bug, please report it using the GitHub issue tracker, or better yet, fork the library and submit a pull request.

Contributing

We encourage you to contribute to this project. Please check out the Contributing documentation for guidelines about how to get involved.

License

"PHP Helpers: Factory Foundation Classes" is released under the MIT License.