zkrati/class-factory

Simple library to manage class instances. It handles dependencies and supports lazy instantiating.

0.1 2016-08-11 08:37 UTC

MIT

• Boomerank

README

Simple library to manage class instances. It handles dependencies and supports lazy instantiating.

• create instances of given classes for you
• ensures that there is only single instance of one class
• handles dependencies of the class

Version

0.1

Basic usage

// create ClassFactory
$factory = new Zkrati\ClassManagement\ClassFactory();

// add class to ClassFactory, where first argument is a class name and second argument is an array of dependencies
$factory->addClass("Example\ClassName", array("First\Dependency", "Second\One");

// get instance of the class
$factory->getInstance("Example\ClassName");

simple right? You don´t need to bother with instantiating dependencies what so ever. ClassFactory handles that for you. Even dependencies can have it´s own dependencies. No problem for ClassFactory!

If you make a complex project it would be uncomfortable adding classes one by one.

// create array like this one. Manualy in the code or parse from config file.
array(3) {
  ["Url\UrlTools"]=>
  array(1) {
    [0]=>
    string(22) "Nette\Database\Context"
  }
  ["Nette\Database\Context"]=>
  array(2) {
    [0]=>
    string(25) "Nette\Database\Connection"
    [1]=>
    string(24) "Nette\Database\Structure"
  }
  ["Nette\Database\Structure"]=>
  array(2) {
    [0]=>
    string(25) "Nette\Database\Connection"
    [1]=>
    string(34) "Nette\Caching\Storages\FileStorage"
  }
}

// give this group of classes to ClassFactory
$factory->addMultiple(array_of_classes);

If you need to create your own instance of some class for some reason, you can pass the created instance

$myClass = new Example\ClassName();

// add created instance to ClassFactory
$factory->addInstance($myClass);

// and than you cen get it
$factory->getInstance("Example\ClassName");

Exceptions

If you want ClassFactory to give you an instance of a a class you didn´t tell ClassFactory about, it will throw UnknownClassnameException. So it is a good idea to catch it.

try{
    // get instance of unknown class
    $factory->getInstance("Unknown\ClassName");
} catch(UnknownClassnameException $e) {
    $e->getMessage();
}

License

MIT