private $resource;
private $exists;
+ private static $autoloadLevel = 0;
+ private static $autoloadedClass;
+ private static $existsCache = array();
+
/**
- * @param string $resource The fully-qualified class name
+ * @param string $resource The fully-qualified class name
+ * @param bool|null $exists Boolean when the existency check has already been done
*/
- public function __construct($resource)
+ public function __construct($resource, $exists = null)
{
$this->resource = $resource;
- $this->exists = class_exists($resource);
+ if (null !== $exists) {
+ $this->exists = (bool) $exists;
+ }
}
/**
/**
* {@inheritdoc}
+ *
+ * @throws \ReflectionException when a parent class/interface/trait is not found
*/
public function isFresh($timestamp)
{
- return class_exists($this->resource) === $this->exists;
+ $loaded = class_exists($this->resource, false) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
+
+ if (null !== $exists = &self::$existsCache[(int) (0 >= $timestamp)][$this->resource]) {
+ $exists = $exists || $loaded;
+ } elseif (!$exists = $loaded) {
+ if (!self::$autoloadLevel++) {
+ spl_autoload_register(__CLASS__.'::throwOnRequiredClass');
+ }
+ $autoloadedClass = self::$autoloadedClass;
+ self::$autoloadedClass = $this->resource;
+
+ try {
+ $exists = class_exists($this->resource) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
+ } catch (\ReflectionException $e) {
+ if (0 >= $timestamp) {
+ unset(self::$existsCache[1][$this->resource]);
+ throw $e;
+ }
+ } finally {
+ self::$autoloadedClass = $autoloadedClass;
+ if (!--self::$autoloadLevel) {
+ spl_autoload_unregister(__CLASS__.'::throwOnRequiredClass');
+ }
+ }
+ }
+
+ if (null === $this->exists) {
+ $this->exists = $exists;
+ }
+
+ return $this->exists xor !$exists;
}
/**
*/
public function serialize()
{
+ if (null === $this->exists) {
+ $this->isFresh(0);
+ }
+
return serialize(array($this->resource, $this->exists));
}
{
list($this->resource, $this->exists) = unserialize($serialized);
}
+
+ /**
+ * @throws \ReflectionException When $class is not found and is required
+ */
+ private static function throwOnRequiredClass($class)
+ {
+ if (self::$autoloadedClass === $class) {
+ return;
+ }
+ $e = new \ReflectionException("Class $class not found");
+ $trace = $e->getTrace();
+ $autoloadFrame = array(
+ 'function' => 'spl_autoload_call',
+ 'args' => array($class),
+ );
+ $i = 1 + array_search($autoloadFrame, $trace, true);
+
+ if (isset($trace[$i]['function']) && !isset($trace[$i]['class'])) {
+ switch ($trace[$i]['function']) {
+ case 'get_class_methods':
+ case 'get_class_vars':
+ case 'get_parent_class':
+ case 'is_a':
+ case 'is_subclass_of':
+ case 'class_exists':
+ case 'class_implements':
+ case 'class_parents':
+ case 'trait_exists':
+ case 'defined':
+ case 'interface_exists':
+ case 'method_exists':
+ case 'property_exists':
+ case 'is_callable':
+ return;
+ }
+
+ $props = array(
+ 'file' => $trace[$i]['file'],
+ 'line' => $trace[$i]['line'],
+ 'trace' => array_slice($trace, 1 + $i),
+ );
+
+ foreach ($props as $p => $v) {
+ $r = new \ReflectionProperty('Exception', $p);
+ $r->setAccessible(true);
+ $r->setValue($e, $v);
+ }
+ }
+
+ throw $e;
+ }
}