<?php
namespace JPT\SocketFramework\Core;

/**
 * Simple class to capsule the classloader so more than one autoload function can be used.
 * 
 * @author JPT
 */
class ClassLoader {

	/**
	 * Contains class name prefix and path prefix for all class paths it shall handle
	 * 
	 * @var array
	 */
	protected $classNameMapping = array();
	
	/**
	 * Default constructor.
	 * Registers the main class path for the socket framework.
	 */
	public function __construct() {
		$this->classNameMapping = array(
			'JPT\SocketFramework' =>  'SocketFramework' . \DIRECTORY_SEPARATOR . 'Classes'
		);
	}
	
	/**
	 * Registers a new class path for the autoloader
	 * 
	 * @param string $classNamePrefix
 	 * @param string $pathPrefix
	 */
	public function addClassPathMapping($classNamePrefix, $pathPrefix) {
		$this->classNameMapping[$classNamePrefix] = $pathPrefix;	
	}
	
	/**
	 * Autoloader function.
	 * 
	 * @throws \Exception
	 * @param string $className
	 * @return void
	 */
	public function loadClass($className) {
		$matchingClassNamePrefix = FALSE;
		foreach($this->classNameMapping AS $classNamePrefix => $pathPrefix) {
			if(substr($className, 0, strlen($classNamePrefix)) !== $classNamePrefix) continue;
			$matchingClassNamePrefix = TRUE;
			$classNameSuffix = substr($className, strlen($classNamePrefix), strlen($className));
			$fileName = $this->classNameMapping[$classNamePrefix];
			$fileName .= \DIRECTORY_SEPARATOR . str_replace('\\', \DIRECTORY_SEPARATOR, $classNameSuffix) . ".php";	
			break;
		}
		if($matchingClassNamePrefix === FALSE) return;		
		if(file_exists($fileName) === TRUE) {
			require_once($fileName);
		} else {
			throw new \Exception("Could not load class: '" . $className . "' - File does not exist: '" . $fileName . "'!", 1289659295);
		}
	}
	
	/**
	 * Simple function that registers loadClass as an autoloader.
	 * 
	 * @return void
	 * @throws Exception in case spl_autoload_register fails.
	 */
	public function initialize() {
		spl_autoload_register(array($this, 'loadClass'), TRUE, TRUE);
	}
	
}

?>