text: //
  //   ______     _   _                 _          _____ _____  _  __
  //  |  ____|   | | (_)               | |        / ____|  __ \| |/ /
  //  | |__   ___| |_ _ _ __ ___   ___ | |_ ___  | (___ | |  | | ' /
  //  |  __| / __| __| | '_ ` _ \ / _ \| __/ _ \  \___ \| |  | |  <
  //  | |____\__ \ |_| | | | | | | (_) | ||  __/  ____) | |__| | . \
  //  |______|___/\__|_|_| |_| |_|\___/ \__\___| |_____/|_____/|_|\_\
  //
  //
  //  Version: 3.3.1
  //  Copyright (c) 2015 Estimote. All rights reserved.
  
  #import <Foundation/Foundation.h>
  #import "ESTTrigger.h"
  
  /**
   * The `ESTRule` class defines single rule of `<ESTTrigger>` object. Each rule has state value that indicates if it was fulfilled or not.
   */
  @interface ESTRule : NSObject
  
  /**
   *  Current state of the rule.
   */
  @property (nonatomic, assign) BOOL state;
  
  /**
   *  Method that is invoked by trigger manager object to update state of the rule.
   *  
   *  When creating custom rule, this method should be implemented to update state property of this class, 
   *  based on developer defined conditions.
   */
  - (void)update;
  
  @end
  