<?php

class mfValuecache {
  public static $instance;
  public $cache = [];
  
  private function __construct() { }
	
	public static function singleton() {
		if(!isset(self::$instance)) {
			$c=__CLASS__;
			self::$instance=new $c();
		}
		return self::$instance;
	}
  
  public function get($key) {
    if(array_key_exists($key, $this->cache)) {
      return $this->cache[$key];
    }
    return null;
  }
  
  public function set($key, $value) {
    $this->cache[$key] = $value;
    return true;
  }
  
  public function getCache() {
    return $this->cache;
  }

  public function delete($key) {
      unset($this->cache[$key]);
      return true;
  }

  public function purge($beginning = "", $casesensitive = true) {
      if(!$beginning) {
          $this->cache = [];
          return true;
      }

      foreach($this->cache as $key => $value) {
          if(!$casesensitive) {
              if(strpos(strtolower($key), strtolower($beginning)) === 0) {
                  unset($this->cache[$key]);
              }
          }
          if(strpos($key, $beginning) === 0) {
              unset($this->cache[$key]);
          }
      }

      return true;
  }

  public function getMfObject($objectname, $id) {
    $object = $this->get("mfObjectmodel-$objectname-".$id);
    if(!$object) {
      $object = new $objectname($id);
      $a = new ADBNetzgebiet(1);
      if((method_exists($object, "isLoaded") && !$object->isLoaded()) || !$object->id) {
        $this->set("mfObjectmodel-$objectname-".$id, $object);
      }
    }
    
    return $object;
  }
}