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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category  Zend
  * @package   Zend_Uri
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  * @version   $Id$
  */
 
 /**
  * Abstract class for all Zend_Uri handlers
  *
  * @category  Zend
  * @package   Zend_Uri
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Uri
 {
     /**
      * Scheme of this URI (http, ftp, etc.)
      *
      * @var string
      */
     protected $_scheme = '';
 
     /**
      * Global configuration array
      *
      * @var array
      */
     static protected $_config = array(
         'allow_unwise' => false
     );
 
     /**
      * Return a string representation of this URI.
      *
      * @see    getUri()
      * @return string
      */
     public function __toString()
     {
         try {
             return $this->getUri();
         } catch (Exception $e) {
             trigger_error($e->getMessage(), E_USER_WARNING);
             return '';
         }
     }
 
     /**
      * Convenience function, checks that a $uri string is well-formed
      * by validating it but not returning an object.  Returns TRUE if
      * $uri is a well-formed URI, or FALSE otherwise.
      *
      * @param  string $uri The URI to check
      * @return boolean
      */
     public static function check($uri)
     {
         try {
             $uri = self::factory($uri);
         } catch (Exception $e) {
             return false;
         }
 
         return $uri->valid();
     }
 
     /**
      * Create a new Zend_Uri object for a URI.  If building a new URI, then $uri should contain
      * only the scheme (http, ftp, etc).  Otherwise, supply $uri with the complete URI.
      *
      * @param  string $uri       The URI form which a Zend_Uri instance is created
      * @param  string $className The name of the class to use in order to manipulate URI
      * @throws Zend_Uri_Exception When an empty string was supplied for the scheme
      * @throws Zend_Uri_Exception When an illegal scheme is supplied
      * @throws Zend_Uri_Exception When the scheme is not supported
      * @throws Zend_Uri_Exception When $className doesn't exist or doesn't implements Zend_Uri
      * @return Zend_Uri
      * @link   http://www.faqs.org/rfcs/rfc2396.html
      */
     public static function factory($uri = 'http', $className = null)
     {
         // Separate the scheme from the scheme-specific parts
         $uri            = explode(':', $uri, 2);
         $scheme         = strtolower($uri[0]);
         $schemeSpecific = isset($uri[1]) === true ? $uri[1] : '';
 
         if (strlen($scheme) === 0) {
             // require_once 'Zend/Uri/Exception.php';
             throw new Zend_Uri_Exception('An empty string was supplied for the scheme');
         }
 
         // Security check: $scheme is used to load a class file, so only alphanumerics are allowed.
         if (ctype_alnum($scheme) === false) {
             // require_once 'Zend/Uri/Exception.php';
             throw new Zend_Uri_Exception('Illegal scheme supplied, only alphanumeric characters are permitted');
         }
 
         if ($className === null) {
             /**
              * Create a new Zend_Uri object for the $uri. If a subclass of Zend_Uri exists for the
              * scheme, return an instance of that class. Otherwise, a Zend_Uri_Exception is thrown.
              */
             switch ($scheme) {
                 case 'http':
                     // Break intentionally omitted
                 case 'https':
                     $className = 'Zend_Uri_Http';
                     break;
 
                 case 'mailto':
                     // TODO
                 default:
                     // require_once 'Zend/Uri/Exception.php';
                     throw new Zend_Uri_Exception("Scheme \"$scheme\" is not supported");
                     break;
             }
         }
 
         // require_once 'Zend/Loader.php';
         try {
             Zend_Loader::loadClass($className);
         } catch (Exception $e) {
             // require_once 'Zend/Uri/Exception.php';
             throw new Zend_Uri_Exception("\"$className\" not found");
         }
 
         $schemeHandler = new $className($scheme, $schemeSpecific);
 
         if (! $schemeHandler instanceof Zend_Uri) {
             // require_once 'Zend/Uri/Exception.php';
             throw new Zend_Uri_Exception("\"$className\" is not an instance of Zend_Uri");
         }
 
         return $schemeHandler;
     }
 
     /**
      * Get the URI's scheme
      *
      * @return string|false Scheme or false if no scheme is set.
      */
     public function getScheme()
     {
         if (empty($this->_scheme) === false) {
             return $this->_scheme;
         } else {
             return false;
         }
     }
 
     /**
      * Set global configuration options
      *
      * @param Zend_Config|array $config
      */
     static public function setConfig($config)
     {
         if ($config instanceof Zend_Config) {
             $config = $config->toArray();
         } elseif (!is_array($config)) {
             throw new Zend_Uri_Exception("Config must be an array or an instance of Zend_Config.");
         }
 
         foreach ($config as $k => $v) {
             self::$_config[$k] = $v;
         }
     }
 
     /**
      * Zend_Uri and its subclasses cannot be instantiated directly.
      * Use Zend_Uri::factory() to return a new Zend_Uri object.
      *
      * @param string $scheme         The scheme of the URI
      * @param string $schemeSpecific The scheme-specific part of the URI
      */
     abstract protected function __construct($scheme, $schemeSpecific = '');
 
     /**
      * Return a string representation of this URI.
      *
      * @return string
      */
     abstract public function getUri();
 
     /**
      * Returns TRUE if this URI is valid, or FALSE otherwise.
      *
      * @return boolean
      */
     abstract public function valid();
 }