silverstripe-fulltextsearch/code/search/SearchIntrospection.php

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<?php
/**
* Some additional introspection tools that are used often by the fulltext search code
*/
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class SearchIntrospection
{
protected static $ancestry = array();
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/**
* Check if class is subclass of (a) the class in $of, or (b) any of the classes in the array $of
* @static
* @param $class
* @param $of
* @return bool
*/
public static function is_subclass_of($class, $of)
{
$ancestry = isset(self::$ancestry[$class]) ? self::$ancestry[$class] : (self::$ancestry[$class] = ClassInfo::ancestry($class));
return is_array($of) ? (bool)array_intersect($of, $ancestry) : array_key_exists($of, $ancestry);
}
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protected static $hierarchy = array();
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/**
* Get all the classes involved in a DataObject hierarchy - both super and optionally subclasses
*
* @static
* @param String $class - The class to query
* @param bool $includeSubclasses - True to return subclasses as well as super classes
* @param bool $dataOnly - True to only return classes that have tables
* @return Array - Integer keys, String values as classes sorted by depth (most super first)
*/
public static function hierarchy($class, $includeSubclasses = true, $dataOnly = false)
{
$key = "$class!" . ($includeSubclasses ? 'sc' : 'an') . '!' . ($dataOnly ? 'do' : 'al');
if (!isset(self::$hierarchy[$key])) {
$classes = array_values(ClassInfo::ancestry($class));
if ($includeSubclasses) {
$classes = array_unique(array_merge($classes, array_values(ClassInfo::subclassesFor($class))));
}
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$idx = array_search('DataObject', $classes);
if ($idx !== false) {
array_splice($classes, 0, $idx+1);
}
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if ($dataOnly) {
foreach ($classes as $i => $class) {
if (!DataObject::has_own_table($class)) {
unset($classes[$i]);
}
}
}
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self::$hierarchy[$key] = $classes;
}
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return self::$hierarchy[$key];
}
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/**
* Add classes to list, keeping only the parent when parent & child are both in list after add
*/
public static function add_unique_by_ancestor(&$list, $class)
{
// If class already has parent in list, just ignore
if (self::is_subclass_of($class, $list)) {
return;
}
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// Strip out any subclasses of $class already in the list
$children = ClassInfo::subclassesFor($class);
$list = array_diff($list, $children);
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// Then add the class in
$list[] = $class;
}
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/**
* Does this class, it's parent (or optionally one of it's children) have the passed extension attached?
*/
public static function has_extension($class, $extension, $includeSubclasses = true)
{
foreach (self::hierarchy($class, $includeSubclasses) as $relatedclass) {
if ($relatedclass::has_extension($extension)) {
return true;
}
}
return false;
}
}