<?php
/* 
 */

/**
 * This filter only accepts context events and extensions with the "Macro"
 * application and specific macro names.
 *
 * @author gbirke
 */
class Dialplan_Builder_MacroFilter extends Dialplan_Builder_Filter {

  protected $_allowedMacros = array();

  public function __construct($eventDispatcher = null, $allowedMacros = array()) {
    parent::__construct($eventDispatcher);
    $this->_allowedMacros = $allowedMacros;
    $this->_state = self::STATE_QUEUE;
  }
  
  protected function _filter($emitter, $notification) {
    switch($notification->type) {
      case 'priority':
        if($notification->priority == 'hint') {
          $this->_state = self::STATE_DROP;
        }
        break;
      case 'extension':
        $this->_state = self::STATE_QUEUE;
        $this->_currentApplication = '';
        break;
      case 'application':
        if($notification->application != 'Macro') {
          $this->_state = self::STATE_DROP;
        }
        break;
      case 'parameter':
        if($notification->position != 1)
          return;
        if(in_array($notification->parameter, $this->_allowedMacros)) {
          $this->_state = self::STATE_ACCEPT;
        }
        else {
          $this->_state = self::STATE_DROP;
        }
        break;
        case 'newline':
          if($this->_state != self::STATE_ACCEPT) {
            $this->_eventQueue = array();
          }
          $this->_state = self::STATE_ACCEPT;
          break;
        case 'endfile':
          $this->_state = self::STATE_ACCEPT;
          break;
    }

  }

  public function getNotificationTypes() {
    $types = array_merge(
            parent::getNotificationTypes(),
            array('priority', 'extension', 'application', 'parameter', 'fileend', 'newline')
            );
    return array_keys(array_flip($types));
  }

  public function getAllowedMacros() {
    return $this->_allowedMacros;
  }

  public function setAllowedMacros($allowedMacros) {
    $this->_allowedMacros = $allowedMacros;
    return $this;
  }


}
?>