Charcoal object creation (Factory, AbstractFactory, Builder, Class Resolver)

0.4.2 2017-10-13 12:38 UTC

This package is auto-updated.

Last update: 2024-05-05 17:54:10 UTC


Factories create (or build) dynamic PHP objects. 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.

Build Status

Table of contents

  • How to install
    • Dependencies
  • Factories
    • Usage
    • The resolver
    • Class map / aliases
    • Ensuring a type of object
    • Setting a default type of object
    • Constructor arguments
    • Executing an object callback
  • Development
    • Development dependencies
    • Continus integration
    • Coding style
    • Authors
    • Changelog
  • License

How to install

The preferred (and only supported) way of installing charcoal-factory is with composer:

★ composer require locomotivemtl/charcoal-factory


  • PHP 5.5+
    • Older versions of PHP are deprecated, therefore not supported for charcoal-factory.

👉 Development dependencies, which are optional when using charcoal-factory, are described in the Development section of this README file.



Factories have only one purpose: to create / instanciate new PHP objects. 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' => [

    // Object callback
    'callback' => function (&obj) {

// Create a "\My\Custom\Baz" object with the given arguments + callbck

// Create a "\My\Foo" object (using the map of aliases)

// Create a "\My\Custom\FooBar" object with the default resolver

Constructor options (class dependencies) are:

Name Type Default Description
base_class string '' Optional. A base class (or interface) to ensure a type of object.
default_class string '' Optional. A default class, as fallback when the requested object is not resolvable.
arguments array [] Optional. Constructor arguments that will be passed along to created instances.
callback Callable null Optional. A callback function that will be called upon object creation.
resolver Callable null[1] Optional. A class resolver. If none is provided, a default will be used.
resolver_options array null Optional. Resolver options (prefix, suffix, capitals and replacements). This is ignored / unused if resolver is provided.

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

The resolver

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 map / aliases

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

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.

Setting a default type of object

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.

Constructor arguments

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']

Executing an object callback

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);

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->logger->debug('Objet instanciated from factory.');


To install the development environment:

★ composer install --prefer-source

To run the scripts (phplint, phpcs and phpunit):

★ composer test

Development dependencies

  • phpunit/phpunit
  • squizlabs/php_codesniffer
  • satooshi/php-coveralls

Continuous Integration

Service Badge Description
Travis Build Status Runs code sniff check and unit tests. Auto-generates API documentation.
Scrutinizer Scrutinizer Code Quality Code quality checker. Also validates API documentation quality.
Coveralls Coverage Status Unit Tests code coverage.
Sensiolabs SensioLabsInsight Another code quality checker, focused on PHP.

Coding Style

All Charcoal modules follow the same coding style and charcoal-factory is no exception. For PHP:

Coding style validation / enforcement can be performed with composer phpcs. An auto-fixer is also available with composer phpcbf.



Charcoal is licensed under the MIT license. See LICENSE for details.



  • Split resolved classname "cache" by factory class.


Released 2016-03-22

  • Keep resolved classname in memory. Can greatly speed things up if instancing many objects.


Released 2016-01-28

  • Add the setArguments() method to factories.
  • Add the setCallback() method to factories.
  • Execute the callback when using the default class too.


Released 2016-01-26

Minor (but BC-breaking) changes to Charcoal-Factory

  • Full PSR1 compliancy (All methods are now camel-case).
  • Add a callback argument to the create() method.
  • create() and get() are now final in the base abstract factory class.
  • Internal code, docs and tool improvements.


Released 2015-11-25

  • Initial release