Design Pattern: State and Combination Locks

cleared_state.rb

class ClearedState
  attr_reader :lock, :state_name
  
  def initialize(lock)
    @lock = lock
    @state_name = 'Cleared State'
  end
  
  def dial_to(number)
    if number == 7
      lock.state = lock.entered_pin_one_state
    else
      lock.state = lock.entered_wrong_pin_state
    end
  end
  
  def clear
    puts "The lock is cleared. Clear does nothing."
  end
  
  def pull_to_open
    puts 'The lock is still locked'
    puts "  currently in #{state_name}"
  end
  
  def push_to_lock
    puts 'The lock is already locked'
    puts "  currently in #{state_name}"
  end
end