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<?php |
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namespace Charcoal\Factory; |
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// Dependencies from `PHP` |
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use \InvalidArgumentException; |
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// Local namespace dependencies |
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use \Charcoal\Factory\AbstractFactory; |
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/** |
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* The map Factory resolves the **class name** from an associative array with the **type** key. |
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* |
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*/ |
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class MapFactory extends AbstractFactory |
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{ |
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/** |
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* The class map array holds available types, in `[$type => $className]` format. |
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* @var array $map |
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*/ |
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private $map = []; |
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public function __construct($data=null) |
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{ |
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parent::__construct($data); |
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if ($data['map']) { |
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$this->setMap($data['map']); |
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} |
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} |
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/** |
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* Add a class name to the available types _map_. |
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* |
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* @param string $type The type (class ident). |
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* @param string $className The FQN of the class. |
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* @throws InvalidArgumentException If the $type parameter is not a striing or the $className class does not exist. |
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* @return FactoryInterface Chainable |
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*/ |
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public function addClass($type, $className) |
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{ |
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if (!is_string($type)) { |
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throw new InvalidArgumentException( |
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'Type (class key) must be a string' |
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); |
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} |
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if (!class_exists($className)) { |
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throw new InvalidArgumentException( |
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sprintf('Class "%s" is not a valid class name.', $className) |
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); |
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} |
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$this->map[$type] = $className; |
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return $this; |
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} |
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/** |
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* Add multiple types, in a an array of `type` => `className`. |
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* |
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* @param array $map The map (key=>classname) to use. |
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* @return FactoryInterface Chainable |
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*/ |
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public function setMap(array $map) |
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{ |
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// Resets (overwrites) map. |
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$this->map = []; |
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foreach ($map as $type => $className) { |
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$this->addClass($type, $className); |
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} |
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return $this; |
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} |
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/** |
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* Get the map of all types in `[$type => $class]` format. |
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* |
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* @return array |
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*/ |
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public function map() |
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{ |
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return $this->map; |
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} |
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/** |
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* The "Map Factory" implements `AbstractFactory`'s `resolve()` abstract method |
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* by fetching the class ident from the `map` member array. |
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* |
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* If the object's `type` is not defined in the class map, an exception will be thrown. |
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* |
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* @param string $type The "type" of object to resolve (the object ident). |
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* @throws InvalidArgumentException If the type parameter is not a string. |
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* @return string The resolved class name (FQN). |
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*/ |
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public function resolve($type) |
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{ |
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if (!is_string($type)) { |
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throw new InvalidArgumentException( |
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'Can not resolve class ident: type must be a string' |
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); |
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} |
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$map = $this->map(); |
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if (!isset($map[$type])) { |
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throw new InvalidArgumentException( |
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'Invalid type (not defined in class map)' |
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); |
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} |
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return $map[$type]; |
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} |
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/** |
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* The "Map Factory" implements `AbstractFactory`'s `is_resolvable()` abstract method |
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* by ensuring the class ident is defined in the class map and is a validd class. |
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* |
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* @param string $type The "type" of object to resolve (the object ident). |
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* @throws InvalidArgumentException If the type parameter is not a string. |
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* @return boolean |
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*/ |
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public function isResolvable($type) |
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{ |
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if (!is_string($type)) { |
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throw new InvalidArgumentException( |
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'Can not check resolvable: type must be a string' |
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); |
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} |
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$map = $this->map(); |
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if (!isset($map[$type])) { |
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return false; |
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} |
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$className = $map[$type]; |
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return !!class_exists($className); |
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} |
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} |
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locomotivemtl /
charcoal-factory
