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<?php
namespace PhpCollection;
use PhpCollection\ObjectBasicsHandler\IdentityHandler;
/**
* Registry for handlers that provide ObjectBasics functionality for classes.
*
* You want to register a handler if you cannot implement the ObjectBasics interface, for example
* because a class is provided by a third-party package, or built into PHP.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
abstract class ObjectBasicsHandlerRegistry
{
private static $handlers = array(
'DateTime' => 'PhpCollection\\ObjectBasicsHandler\\DateTimeHandler',
);
private static $defaultObjectHandler;
private static $aliases = array();
/**
* Defines an alias.
*
* $aliasClass must be a sub-type (extend or implement) $handlingClass; otherwise you will run into trouble.
*
* Aliases can only be one level deep,
*
* i.e. aliasClass -> handlingClass is supported,
* but aliasClass -> anotherAliasClass -> handlingClass is not.
*
* @param string $handlingClass The class that should be aliased, i.e. MyDateTime
* @param string $aliasClass The class that should be used instead, i.e. DateTime
*/
public static function addAliasFor($handlingClass, $aliasClass)
{
self::$aliases[$handlingClass] = $aliasClass;
}
public static function addHandlerFor($handlingClass, $handlerInstanceOrClassName)
{
if ( ! $handlerInstanceOrClassName instanceof ObjectBasicsHandler && ! is_string($handlerInstanceOrClassName)) {
throw new \LogicException('$handler must be an instance of ObjectBasicsHandler, or a string referring to the handlers class.');
}
self::$handlers[$handlingClass] = $handlerInstanceOrClassName;
}
public static function getHandler($className)
{
if (isset(self::$aliases[$className])) {
$className = self::$aliases[$className];
}
if ( ! isset(self::$handlers[$className])) {
if (self::$defaultObjectHandler === null) {
self::$defaultObjectHandler = new IdentityHandler();
}
return self::$defaultObjectHandler;
}
if (self::$handlers[$className] instanceof ObjectBasicsHandler) {
return self::$handlers[$className];
}
if (is_string(self::$handlers[$className])) {
$handlerClass = self::$handlers[$className];
return self::$handlers[$className] = new $handlerClass();
}
throw new \LogicException(sprintf(
'Unknown handler type ("%s") for class "%s" - should never be reached.',
gettype(self::$handlers[$className]),
$className
));
}
private final function __construct() { }
}