97 lines
2.3 KiB
PHP
97 lines
2.3 KiB
PHP
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<?php
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/**
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* @file
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* @ingroup FileBackend
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*/
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/**
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* Class to handle file backend registration
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*
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* @ingroup FileBackend
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*/
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class FileBackendGroup {
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protected static $instance = null;
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/** @var Array of (name => ('class' =>, 'config' =>, 'instance' =>)) */
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protected $backends = array();
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protected function __construct() {}
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protected function __clone() {}
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public static function singleton() {
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if ( self::$instance == null ) {
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self::$instance = new self();
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}
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return self::$instance;
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}
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/**
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* Destroy the singleton instance, so that a new one will be created next
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* time singleton() is called.
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*/
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public static function destroySingleton() {
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self::$instance = null;
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}
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/**
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* Register an array of file backend configurations
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*
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* @param $configs Array
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* @return void
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* @throws MWException
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*/
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public function register( array $configs ) {
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foreach ( $configs as $config ) {
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if ( !isset( $config['name'] ) ) {
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throw new MWException( "Cannot register a backend with no name." );
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}
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$name = $config['name'];
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if ( !isset( $config['class'] ) ) {
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throw new MWException( "Cannot register backend `{$name}` with no class." );
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}
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$class = $config['class'];
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unset( $config['class'] ); // backend won't need this
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$this->backends[$name] = array(
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'class' => $class,
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'config' => $config,
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'instance' => null
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);
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}
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}
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/**
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* Get the backend object with a given name
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*
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* @param $name string
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* @return FileBackendBase
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* @throws MWException
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*/
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public function get( $name ) {
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if ( !isset( $this->backends[$name] ) ) {
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throw new MWException( "No backend defined with the name `$name`." );
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}
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// Lazy-load the actual backend instance
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if ( !isset( $this->backends[$name]['instance'] ) ) {
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$class = $this->backends[$name]['class'];
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$config = $this->backends[$name]['config'];
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$this->backends[$name]['instance'] = new $class( $config );
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}
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return $this->backends[$name]['instance'];
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}
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/**
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* Get an appropriate backend object from a storage path
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*
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* @param $storagePath string
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* @return FileBackendBase|null Backend or null on failure
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*/
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public function backendFromPath( $storagePath ) {
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list( $backend, $c, $p ) = FileBackend::splitStoragePath( $storagePath );
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if ( $backend !== null && isset( $this->backends[$backend] ) ) {
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return $this->get( $backend );
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}
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return null;
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}
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}
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