The Factory package provides abstract object factories to create objects.

composer require charcoal/factory

Factories can resolve a type to a FQN and create instance of this class with an optional given set of arguments, while ensuring a default base class.

Factory options should be set directly from the constructor:

$factory = new Charcoal\Factory\GenericFactory([
    // Ensure the created object is a Charcoal Model
    'base_class' => '\Charcoal\Model\ModelInterface',

    // An associative array of class map (aliases)
    'map' => [
        'foo' => '\My\Foo',
        'bar' => '\My\Bar',
    ],

    // Constructor arguments
    'arguments' => [
        $dep1,
        $dep2,
    ],

    // Object callback
    'callback' => function ($obj) {
        $obj->do('foo');
    },
]);

// Create a "\My\Custom\Baz" object with the given arguments + callbck
$factory->create('\My\Custom\Baz');

// Create a "\My\Foo" object (using the map of aliases)
$factory->create('foo');

// Create a "\My\Custom\FooBar" object with the default resolver
$factory->create('my/custom/foo-bar');

Constructor options (class dependencies) are:

Notes:

• ^[1] If no resolver is provided, a default \Charcoal\Factory\GenericResolver will be used.

The type (class identifier) sent to the create() method can be parsed / resolved with a custom Callable resolver.

If no resolver is passed to the constructor, a default \Charcoal\Factory\GenericResolver is used. This default resolver transforms, for example, my/custom/foo-bar into \My\Custom\FooBar.

Class aliases can be added by setting them in the Factory constructor:

$factory = new GenericFactory([
    'map' => [
        'foo' => '\My\Foo',
        'bar' => '\My\Bar',
    ],
]);

// Create a `\My\Foo` instance
$obj = $factory->create('foo');

Ensuring a type of object can be done by setting the base_class property.

The recommended way of setting the base class is by setting it in the constructor:

$factory = new GenericFactory([
    'base_class' => '\My\Foo\BaseClassInterface',
]);

👉 Note that Interfaces can also be used as a factory's base class.

It is possible to set a default type of object (default class) by setting the default_class property.

The recommended way of setting the default class is by setting it in the constructor:

$factory = new GenericFactory([
    'default_class' => '\My\Foo\DefaultClassInterface',
]);

⚠️ Setting a default class name changes the standard Factory behavior. When an invalid class name is used, instead of throwing an Exception, an object of the default class type will always be returned.

It is possible to set "automatic" constructor arguments that will be passed to every created object.

The recommended way of setting constructor arguments is by passing an array of arguments to the constructor:

$factory = new GenericFactory([
    'arguments' => [
        [
            'logger' => $container['logger'],
        ],
        $secondArgument,
    ],
]);

It is possible to execute an object callback upon object instanciation. A callback is any Callable that takes the newly created object by reference as its function parameter.

// $obj is the newly created object
function callback($obj): void;

The recommended way of adding an object callback is by passing a Callable to the constructor:

$factory = new GenericFactory([
    'arguments' => [[
        'logger' => $container['logger']
    ]],
    'callback' => function ($obj) {
        $obj->foo('bar');
        $obj->logger->debug('Objet instanciated from factory.');
    }
]);

• Contributing
• Report issues and send pull requests in the main Charcoal repository