mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-27 13:06:04 +02:00
108 lines
2.5 KiB
PHP
108 lines
2.5 KiB
PHP
<?php
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/**
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* A class that handles loading classes and interfaces from a class manifest
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* instance.
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*
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* @package framework
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* @subpackage manifest
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*/
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class SS_ClassLoader {
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/**
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* @var SS_ClassLoader
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*/
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private static $instance;
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/**
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* @var array Map of 'instance' (SS_ClassManifest) and other options.
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*/
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protected $manifests = array();
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/**
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* @return SS_ClassLoader
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*/
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public static function instance() {
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return self::$instance ? self::$instance : self::$instance = new self();
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}
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/**
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* Returns the currently active class manifest instance that is used for
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* loading classes.
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*
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* @return SS_ClassManifest
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*/
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public function getManifest() {
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return $this->manifests[count($this->manifests) - 1]['instance'];
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}
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/**
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* Returns true if this class loader has a manifest.
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*/
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public function hasManifest() {
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return (bool)$this->manifests;
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}
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/**
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* Pushes a class manifest instance onto the top of the stack.
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*
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* @param SS_ClassManifest $manifest
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* @param Boolean Marks the manifest as exclusive. If set to FALSE, will
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* look for classes in earlier manifests as well.
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*/
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public function pushManifest(SS_ClassManifest $manifest, $exclusive = true) {
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$this->manifests[] = array('exclusive' => $exclusive, 'instance' => $manifest);
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}
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/**
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* @return SS_ClassManifest
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*/
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public function popManifest() {
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$manifest = array_pop($this->manifests);
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return $manifest['instance'];
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}
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public function registerAutoloader() {
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spl_autoload_register(array($this, 'loadClass'));
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}
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/**
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* Loads a class or interface if it is present in the currently active
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* manifest.
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*
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* @param string $class
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* @return String
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*/
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public function loadClass($class) {
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if ($path = $this->getItemPath($class)) {
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require_once $path;
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}
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return $path;
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}
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/**
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* Returns the path for a class or interface in the currently active manifest,
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* or any previous ones if later manifests aren't set to "exclusive".
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*
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* @return String
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*/
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public function getItemPath($class) {
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foreach(array_reverse($this->manifests) as $manifest) {
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$manifestInst = $manifest['instance'];
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if ($path = $manifestInst->getItemPath($class)) return $path;
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if($manifest['exclusive']) break;
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}
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return false;
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}
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/**
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* Returns true if a class or interface name exists in the manifest.
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*
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* @param string $class
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* @return bool
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*/
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public function classExists($class) {
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return class_exists($class, false) || interface_exists($class, false) || $this->getItemPath($class);
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}
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}
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