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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
module Record
# @api private
class CountValidator < Validator
ACCEPTED_OPTIONS = [
:exactly, :within, :minimum, :maximum,
:too_many, :too_few, :wrong_number,
:on, :if, :unless,
]
def setup record_class
ensure_at_least_one(:within, :exactly, :minimum, :maximum)
ensure_exclusive(:within, :exactly, [:minimum, :maximum])
ensure_type(Range, :within)
ensure_type(Integer, :exactly, :minimum, :maximum)
ensure_type(String, :too_many, :too_few, :wrong_number)
end
def validate_attribute record, attribute_name, value
count = case value
when nil then 0
when String then 1
when Enumerable then value.count
else 1
end
if exact = options[:exactly]
unless count == exact
record.errors.add(attribute_name, wrong_number(exact, count))
end
end
if within = options[:within]
if count < within.first
record.errors.add(attribute_name, too_few(within.first, count))
end
if count > within.last
record.errors.add(attribute_name, too_many(within.last, count))
end
end
if min = options[:minimum]
if count < min
record.errors.add(attribute_name, too_few(min, count))
end
end
if max = options[:maximum]
if count > max
record.errors.add(attribute_name, too_many(max, count))
end
end
end
# @api private
protected
def wrong_number exactly, got
msg = options[:wrong_number] ||
"has the wrong number of values (should have %{exactly})"
interpolate(msg, :exactly => exactly, :count => got)
end
# @api private
protected
def too_few min, got
msg = options[:too_few] || "has too few values (minimum is %{minimum})"
interpolate(msg, :minimum => min, :count => got)
end
# @api private
protected
def too_many max, got
msg = options[:too_many] || "has too many values (maximum is %{maximum})"
interpolate(msg, :maximum => max, :count => got)
end
protected
def interpolate message_with_placeholders, values
msg = message_with_placeholders.dup
values.each_pair do |key,value|
msg.gsub!(/%\{#{key}\}/, value.to_s)
end
msg
end
end
end
end
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