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doctrine2/lib/Doctrine/Common/ClassLoader.php

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<?php
namespace Doctrine\Common;
/**
* A class loader used to load class files on demand.
*
* Usage recommendation:
* 1) Use only 1 class loader instance.
* 2) Set the base paths to your class libraries (including Doctrine's) through
* $classLoader->setBasePath($prefix, $basePath);
* Example:
* $classLoader->setBasePath('Doctrine', '/usr/local/phplibs/doctrine/lib');
* Then, when trying to load the class Doctrine\ORM\EntityManager, for example
* the classloader will look for /usr/local/phplibs/doctrine/lib/Doctrine/ORM/EntityManager.php
*
* 3) DO NOT setCheckFileExists(true). Doing so is expensive in terms of performance.
* 4) Use an opcode-cache (i.e. APC) (STRONGLY RECOMMENDED).
*
* @since 2.0
* @author Roman S. Borschel <roman@code-factory.org>
*/
class ClassLoader
{
private
$_namespaceSeparator = '\\',
$_fileExtension = '.php',
$_checkFileExists = false,
$_basePaths = array();
/**
* Constructor registers the autoloader automatically
*/
public function __construct()
{
spl_autoload_register(array($this, 'loadClass'));
}
/**
* Set check file exists
*
* @param boolean $bool
* @return void
*/
public function setCheckFileExists($bool)
{
$this->_checkFileExists = $bool;
}
/**
* Set class file extension
*
* @param string $extension
* @return void
*/
public function setClassFileExtension($extension)
{
$this->_fileExtension = $extension;
}
/**
* Set namespace separator
*
* @param string $separator
* @return void
*/
public function setNamespaceSeparator($separator)
{
$this->_namespaceSeparator = $separator;
}
/**
* Sets a static base path for classes with a certain prefix that is prepended
* to the path derived from the class itself.
*
* @param string $classPrefix
* @param string $basePath
*/
public function setBasePath($classPrefix, $basePath)
{
$this->_basePaths[$classPrefix] = $basePath;
}
/**
* Loads the given class or interface.
*
* @param string $classname The name of the class to load.
* @return boolean TRUE if the class has been successfully loaded, FALSE otherwise.
*/
public function loadClass($className)
{
if (class_exists($className, false) || interface_exists($className, false)) {
return false;
}
$prefix = substr($className, 0, strpos($className, $this->_namespaceSeparator));
$class = '';
if (isset($this->_basePaths[$prefix])) {
$class .= $this->_basePaths[$prefix] . DIRECTORY_SEPARATOR;
}
$class .= str_replace($this->_namespaceSeparator, DIRECTORY_SEPARATOR, $className)
. $this->_fileExtension;
if ($this->_checkFileExists) {
if (!$fh = @fopen($class, 'r', true)) {
return false;
}
@fclose($fh);
}
require $class;
return true;
}
}