class.ilContext.php

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<?php

/* Copyright (c) 1998-2010 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilContext
{               
        protected static $class_name; // [string]
        protected static $type; // [int]        
        
        const CONTEXT_WEB = 1;
        const CONTEXT_CRON = 2;
        const CONTEXT_RSS = 3;
        const CONTEXT_ICAL = 4;
        const CONTEXT_SOAP = 5;
        const CONTEXT_WEBDAV = 6;
        const CONTEXT_RSS_AUTH = 7;
        const CONTEXT_WEB_ACCESS_CHECK = 8;
        const CONTEXT_SESSION_REMINDER = 9;
        const CONTEXT_SOAP_WITHOUT_CLIENT = 10;
        const CONTEXT_UNITTEST = 11;
        const CONTEXT_REST = 12;
        
        public static function init($a_type)
        {
                $class_name = self::getClassForType($a_type);
                if($class_name)
                {
                        include_once "Services/Context/classes/class.".$class_name.".php";
                        self::$class_name = $class_name;
                        self::$type = $a_type;
                        return true;
                }
                return false;
        }
        
        protected function getClassForType($a_type)
        {
                switch($a_type)
                {
                        case self::CONTEXT_WEB:
                                return "ilContextWeb";
                                
                        case self::CONTEXT_CRON:
                                return "ilContextCron";
                                
                        case self::CONTEXT_RSS:
                                return "ilContextRss";
                                
                        case self::CONTEXT_ICAL:
                                return "ilContextIcal";
                                
                        case self::CONTEXT_SOAP:
                                return "ilContextSoap";
                        
                        case self::CONTEXT_WEBDAV:
                                return "ilContextWebdav";       
                                
                        case self::CONTEXT_RSS_AUTH:
                                return "ilContextRssAuth";      
                                
                        case self::CONTEXT_WEB_ACCESS_CHECK:
                                return "ilContextWebAccessCheck";       
                        
                        case self::CONTEXT_SESSION_REMINDER:
                                return "ilContextSessionReminder";      
                                
                        case self::CONTEXT_SOAP_WITHOUT_CLIENT:
                                return "ilContextSoapWithoutClient";
                                
                        case self::CONTEXT_UNITTEST:
                                return "ilContextUnitTest";
                                
                        case self::CONTEXT_REST:
                                return 'ilContextRest';
                }
        }
        
        protected static function callContext($a_method)
        {
                if(!self::$class_name)
                {
                        self::init(self::CONTEXT_WEB);
                }               
                return call_user_func(array(self::$class_name, $a_method));
        }
        
        public static function supportsRedirects()
        {
                global $ilCtrl;
                
                // asynchronous calls must never be redirected
                if($ilCtrl && $ilCtrl->isAsynch())
                {
                        return false;
                }
                
                return (bool)self::callContext("supportsRedirects");
        }
        
        public static function hasUser()
        {
                return (bool)self::callContext("hasUser");              
        }
        
        public static function usesHTTP()
        {
                return (bool)self::callContext("usesHTTP");     
        }
        
        public static function hasHTML()
        {
                return (bool)self::callContext("hasHTML");      
        }
        
        public static function usesTemplate()
        {
                return (bool)self::callContext("usesTemplate"); 
        }
        
        public static function initClient()
        {
                return (bool)self::callContext("initClient");   
        }
        
        public static function doAuthentication()
        {
                return (bool)self::callContext("doAuthentication");     
        }
        
        public static function getType()
        {
                return self::$type;
        }
}

?>