mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-01 15:28:02 +02:00
(merged from branches/gsoc) git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@42153 467b73ca-7a2a-4603-9d3b-597d59a354a9
131 lines
4.0 KiB
PHP
Executable File
131 lines
4.0 KiB
PHP
Executable File
<?php
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/**
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* Provides introspection information about the class tree.
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* It's a cached wrapper around the built-in class functions. Sapphire uses class introspection heavily
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* and without the caching it creates an unfortunate performance hit.
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*/
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class ClassInfo {
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/**
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* Returns true if the manifest has actually been built.
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*/
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static function ready() {
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global $_ALL_CLASSES;
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return $_ALL_CLASSES && isset($_ALL_CLASSES['hastable']) && $_ALL_CLASSES['hastable'];
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}
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static function allClasses() {
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global $_ALL_CLASSES;
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return $_ALL_CLASSES['exists'];
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}
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static function exists($class) {
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global $_ALL_CLASSES;
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return isset($_ALL_CLASSES['exists'][$class]) ? $_ALL_CLASSES['exists'][$class] : null;
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}
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static function hasTable($class) {
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global $_ALL_CLASSES;
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return isset($_ALL_CLASSES['hastable'][$class]) ? $_ALL_CLASSES['hastable'][$class] : null;
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}
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/**
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* Returns the manifest of all classes which are present in the database.
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*/
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static function getValidSubClasses(){
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// Get the enum of all page types from the SiteTree table
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$classnameinfo = DB::query("DESCRIBE SiteTree ClassName")->first();
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preg_match_all("/'[^,]+'/", $classnameinfo["Type"], $matches);
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foreach($matches[0] as $value) {
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$classes[] = trim($value, "'");
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}
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return $classes;
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}
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/**
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* Return the database tables linked to this class.
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* Gets an array of the current class, it subclasses and its ancestors. It then filters that list
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* to those with DB tables
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*/
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static function dataClassesFor($class) {
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global $_ALL_CLASSES;
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if(!$_ALL_CLASSES['parents'][$class]) user_error("ClassInfo::dataClassesFor() no parents for $class", E_USER_WARNING);
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foreach($_ALL_CLASSES['parents'][$class] as $subclass) {
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if(isset($_ALL_CLASSES['hastable'][$subclass])){
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$dataClasses[] = $subclass;
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}
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}
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if(isset($_ALL_CLASSES['hastable'][$class])) $dataClasses[] = $class;
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if(isset($_ALL_CLASSES['children'][$class]))
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foreach($_ALL_CLASSES['children'][$class] as $subclass)
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{
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if(isset($_ALL_CLASSES['hastable'][$subclass]))
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{
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$dataClasses[] = $subclass;
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}
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}
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return $dataClasses;
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}
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/**
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* Return the root data class for that class.
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* This root table has a lot of special use in the DataObject system.
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*/
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static function baseDataClass($class) {
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global $_ALL_CLASSES;
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reset($_ALL_CLASSES['parents'][$class]);
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while($val = next($_ALL_CLASSES['parents'][$class])) {
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if($val == 'DataObject') break;
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}
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$baseDataClass = next($_ALL_CLASSES['parents'][$class]);
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return $baseDataClass ? $baseDataClass : $class;
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}
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static function subclassesFor($class){
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global $_ALL_CLASSES;
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$subclasses = isset($_ALL_CLASSES['children'][$class]) ? $_ALL_CLASSES['children'][$class] : null;
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if(isset($subclasses)) array_unshift($subclasses, $class);
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else $subclasses[$class] = $class;
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return $subclasses;
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}
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static function ancestry($class, $onlyWithTables = false) {
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global $_ALL_CLASSES;
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if(!is_string($class)) $class = $class->class;
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$items = $_ALL_CLASSES['parents'][$class];
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$items[$class] = $class;
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if($onlyWithTables) foreach($items as $item) {
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if(!$_ALL_CLASSES['hastable'][$item]) unset($items[$item]);
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}
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return $items;
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}
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/**
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* Return all the class names implementing the given interface.
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* Note: this method is slow; if that becomes a problem you may need to reimplement this to cache results in
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* the manifest.
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* @return array A self-keyed array of class names
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*/
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protected static $implementors_of = array();
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static function implementorsOf($interfaceName) {
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if(array_key_exists($interfaceName, self::$implementors_of)) return self::$implementors_of[$interfaceName];
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$matchingClasses = array();
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$classes = self::allClasses();
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foreach($classes as $potentialClass) {
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if(class_exists($potentialClass)) {
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$refl = new ReflectionClass($potentialClass);
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if($refl->implementsInterface($interfaceName)) {
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$matchingClasses[$potentialClass] = $potentialClass;
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}
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}
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}
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self::$implementors_of[$interfaceName] = $matchingClasses;
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return $matchingClasses;
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}
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}
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?>
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