Viewing file:  ClassLoader.php (8.28 KB) -rw-r--r--
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<?php
namespace Doctrine\Common;
use function class_exists;
use function interface_exists;
use function is_array;
use function is_file;
use function reset;
use function spl_autoload_functions;
use function spl_autoload_register;
use function spl_autoload_unregister;
use function str_replace;
use function stream_resolve_include_path;
use function strpos;
use function trait_exists;
use function trigger_error;
use const DIRECTORY_SEPARATOR;
use const E_USER_DEPRECATED;
@trigger_error(ClassLoader::class . ' is deprecated.', E_USER_DEPRECATED);
/**
* A <tt>ClassLoader</tt> is an autoloader for class files that can be
* installed on the SPL autoload stack. It is a class loader that either loads only classes
* of a specific namespace or all namespaces and it is suitable for working together
* with other autoloaders in the SPL autoload stack.
*
* If no include path is configured through the constructor or {@link setIncludePath}, a ClassLoader
* relies on the PHP <code>include_path</code>.
*
* @deprecated The ClassLoader is deprecated and will be removed in version 4.0 of doctrine/common.
*/
class ClassLoader
{
/**
* PHP file extension.
*
* @var string
*/
protected $fileExtension = '.php';
/**
* Current namespace.
*
* @var string|null
*/
protected $namespace;
/**
* Current include path.
*
* @var string|null
*/
protected $includePath;
/**
* PHP namespace separator.
*
* @var string
*/
protected $namespaceSeparator = '\\';
/**
* Creates a new <tt>ClassLoader</tt> that loads classes of the
* specified namespace from the specified include path.
*
* If no include path is given, the ClassLoader relies on the PHP include_path.
* If neither a namespace nor an include path is given, the ClassLoader will
* be responsible for loading all classes, thereby relying on the PHP include_path.
*
* @param string|null $ns The namespace of the classes to load.
* @param string|null $includePath The base include path to use.
*/
public function __construct($ns = null, $includePath = null)
{
$this->namespace = $ns;
$this->includePath = $includePath;
}
/**
* Sets the namespace separator used by classes in the namespace of this ClassLoader.
*
* @param string $sep The separator to use.
*
* @return void
*/
public function setNamespaceSeparator($sep)
{
$this->namespaceSeparator = $sep;
}
/**
* Gets the namespace separator used by classes in the namespace of this ClassLoader.
*
* @return string
*/
public function getNamespaceSeparator()
{
return $this->namespaceSeparator;
}
/**
* Sets the base include path for all class files in the namespace of this ClassLoader.
*
* @param string|null $includePath
*
* @return void
*/
public function setIncludePath($includePath)
{
$this->includePath = $includePath;
}
/**
* Gets the base include path for all class files in the namespace of this ClassLoader.
*
* @return string|null
*/
public function getIncludePath()
{
return $this->includePath;
}
/**
* Sets the file extension of class files in the namespace of this ClassLoader.
*
* @param string $fileExtension
*
* @return void
*/
public function setFileExtension($fileExtension)
{
$this->fileExtension = $fileExtension;
}
/**
* Gets the file extension of class files in the namespace of this ClassLoader.
*
* @return string
*/
public function getFileExtension()
{
return $this->fileExtension;
}
/**
* Registers this ClassLoader on the SPL autoload stack.
*
* @return void
*/
public function register()
{
spl_autoload_register([$this, 'loadClass']);
}
/**
* Removes this ClassLoader from the SPL autoload stack.
*
* @return void
*/
public function unregister()
{
spl_autoload_unregister([$this, 'loadClass']);
}
/**
* Loads the given class or interface.
*
* @param string $className The name of the class to load.
* @psalm-param class-string $className
*
* @return bool TRUE if the class has been successfully loaded, FALSE otherwise.
*/
public function loadClass($className)
{
if (self::typeExists($className)) {
return true;
}
if (! $this->canLoadClass($className)) {
return false;
}
require($this->includePath !== null ? $this->includePath . DIRECTORY_SEPARATOR : '')
. str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $className)
. $this->fileExtension;
return self::typeExists($className);
}
/**
* Asks this ClassLoader whether it can potentially load the class (file) with
* the given name.
*
* @param string $className The fully-qualified name of the class.
* @psalm-param class-string $className
*
* @return bool TRUE if this ClassLoader can load the class, FALSE otherwise.
*/
public function canLoadClass($className)
{
if ($this->namespace !== null && strpos($className, $this->namespace . $this->namespaceSeparator) !== 0) {
return false;
}
$file = str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $className) . $this->fileExtension;
if ($this->includePath !== null) {
return is_file($this->includePath . DIRECTORY_SEPARATOR . $file);
}
return stream_resolve_include_path($file) !== false;
}
/**
* Checks whether a class with a given name exists. A class "exists" if it is either
* already defined in the current request or if there is an autoloader on the SPL
* autoload stack that is a) responsible for the class in question and b) is able to
* load a class file in which the class definition resides.
*
* If the class is not already defined, each autoloader in the SPL autoload stack
* is asked whether it is able to tell if the class exists. If the autoloader is
* a <tt>ClassLoader</tt>, {@link canLoadClass} is used, otherwise the autoload
* function of the autoloader is invoked and expected to return a value that
* evaluates to TRUE if the class (file) exists. As soon as one autoloader reports
* that the class exists, TRUE is returned.
*
* Note that, depending on what kinds of autoloaders are installed on the SPL
* autoload stack, the class (file) might already be loaded as a result of checking
* for its existence. This is not the case with a <tt>ClassLoader</tt>, who separates
* these responsibilities.
*
* @param string $className The fully-qualified name of the class.
* @psalm-param class-string $className
*
* @return bool TRUE if the class exists as per the definition given above, FALSE otherwise.
*/
public static function classExists($className)
{
return self::typeExists($className, true);
}
/**
* Gets the <tt>ClassLoader</tt> from the SPL autoload stack that is responsible
* for (and is able to load) the class with the given name.
*
* @param string $className The name of the class.
* @psalm-param class-string $className
*
* @return ClassLoader|null The <tt>ClassLoader</tt> for the class or NULL if no such <tt>ClassLoader</tt> exists.
*/
public static function getClassLoader($className)
{
foreach (spl_autoload_functions() as $loader) {
if (! is_array($loader)) {
continue;
}
$classLoader = reset($loader);
if ($classLoader instanceof ClassLoader && $classLoader->canLoadClass($className)) {
return $classLoader;
}
}
return null;
}
/**
* Checks whether a given type exists
*
* @param string $type
* @param bool $autoload
*
* @return bool
*/
private static function typeExists($type, $autoload = false)
{
return class_exists($type, $autoload)
|| interface_exists($type, $autoload)
|| trait_exists($type, $autoload);
}
}
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