<commit_before><?php
	/**
	 * @package toolkit
	 */
	/**
	 * The abstract Extension class contains common methods that most
	 * extensions require to get started in the Symphony environment. They
	 * include the installation updating and uninstallation, as well as a
	 * delegate subscription hook so an extension can perform custom logic
	 * at various times during Symphony execution.
	 */
	Abstract Class Extension{

		/**
		 * Determines that a new navigation group is to created in the Symphony backend
		 * @var integer
		 */
		const NAV_GROUP = 1;

		/**
		 * Determines that a new item is to be added to an existing navigation
		 * group in the Symphony backend
		 * @var integer
		 */
		const NAV_CHILD = 0;

		/**
		 * An associative array of the providers exposed by this extension. The
		 * only valid key at the moment is `data-sources`, with a value of an
		 * array of classname's and human readable object names.
		 *
		 * @since Symphony 2.3
		 * @var array
		 */
		private static $provides = array();

		/**
		 * Default constructor for an Extension, at this time it does nothing
		 */
		public function __construct() {}

		/**
		 * Register all the providers that are exposed by this extension. At the
		 * moment the core only supports `data-sources` objects, but this is
		 * expected to change in the future
		 *
		 * @since Symphony 2.3
		 * @return boolean
		 *  This function will always return true (at the moment)
		 */
		public static function registerProviders() {
			return true;
		}

		/**
		 * Accessor function determines if this extension provides any objects
		 * of a given `$type`. If no `$type` is provided, this function will
		 * return all provider objects.
		 *
		 * @since Symphony 2.3
		 * @param string $type
		 *  The type of provider object to return, `data-sources` is the only
		 *  valid type at this time.
		 * @return array
		 *  If no providers are found, then an empty array is returned, otherwise
		 *  an associative array of classname => human name will be returned.
		 *  eg. `array('RemoteDatasource' => 'Remote Datasource')`
		 */
		public static function providerOf($type = null) {
			self::registerProviders();

			if(is_null($type)) return self::$provides;

			if(!isset(self::$provides[$type])) return array();

			return self::$provides[$type];<commit_msg>Default providerOf function (this can be improved when PHP5.2 is dropped)<commit_after><?php
	/**
	 * @package toolkit
	 */
	/**
	 * The abstract Extension class contains common methods that most
	 * extensions require to get started in the Symphony environment. They
	 * include the installation updating and uninstallation, as well as a
	 * delegate subscription hook so an extension can perform custom logic
	 * at various times during Symphony execution.
	 */
	Abstract Class Extension{

		/**
		 * Determines that a new navigation group is to created in the Symphony backend
		 * @var integer
		 */
		const NAV_GROUP = 1;

		/**
		 * Determines that a new item is to be added to an existing navigation
		 * group in the Symphony backend
		 * @var integer
		 */
		const NAV_CHILD = 0;

		/**
		 * An associative array of the providers exposed by this extension. The
		 * only valid key at the moment is `data-sources`, with a value of an
		 * array of classname's and human readable object names.
		 *
		 * @since Symphony 2.3
		 * @var array
		 */
		private static $provides = array();

		/**
		 * Default constructor for an Extension, at this time it does nothing
		 */
		public function __construct() {}

		/**
		 * Register all the providers that are exposed by this extension. At the
		 * moment the core only supports `data-sources` objects, but this is
		 * expected to change in the future
		 *
		 * @since Symphony 2.3
		 * @return boolean
		 *  This function will always return true (at the moment)
		 */
		public static function registerProviders() {
			return true;
		}

		/**
		 * Accessor function determines if this extension provides any objects
		 * of a given `$type`. If no `$type` is provided, this function will
		 * return all provider objects.
		 *
		 * @since Symphony 2.3
		 * @param string $type
		 *  The type of provider object to return, `data-sources` is the only
		 *  valid type at this time.
		 * @return array
		 *  If no providers are found, then an empty array is returned, otherwise
		 *  an associative array of classname => human name will be returned.
		 *  eg. `array('RemoteDatasource' => 'Remote Datasource')`
		 */
		public static function providerOf($type = null) {
			return array();
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