class ActiveSupport::Callbacks::Filters::Before

def apply(callback_sequence)
  callback_sequence.before(self)
end

def call(env)
  target = env.target
  value  = env.value
  halted = env.halted
  if !halted && user_conditions.all? { |c| c.call(target, value) }
    result_lambda = -> { user_callback.call target, value }
    env.halted = halted_lambda.call(target, result_lambda)
    if env.halted
      target.send :halted_callback_hook, filter, name
    end
  end
  env
end

def initialize(user_callback, user_conditions, chain_config, filter, name)
  halted_lambda = chain_config[:terminator]
  @user_callback, @user_conditions, @halted_lambda, @filter, @name = user_callback, user_conditions, halted_lambda, filter, name
  freeze
end