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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.
require 'bigdecimal'
require 'set'
require 'base64'
module AWS
class DynamoDB
# @api private
module Types
def value_from_response(hash, options = {})
(type, value) = hash.to_a.first
case type
when "S", :s
value
when "SS", :ss
Set[*value]
when "N", :n
cast_number(value, options)
when "NS", :ns
Set[*value.map {|v| cast_number(v, options) }]
when "B", :b
cast_binary(value)
when "BS", :bs
Set[*value.map{|v| cast_binary(v) }]
end
end
def values_from_response_hash(hash, options = {})
hash.inject({}) do |h, (key, value_hash)|
h.update(key => value_from_response(value_hash))
end
end
def format_attribute_value(value, context = nil)
indicator = type_indicator(value, context)
value =
case
when value == :empty_number_set then []
when indicator == :n then value.to_s
when indicator == :ns then value.map(&:to_s)
else value
end
{ indicator => value }
end
protected
def cast_number number, options = {}
cfg = self.respond_to?(:config) ? self.config :
(options[:config] || AWS.config)
cfg.dynamo_db_big_decimals ? BigDecimal.new(number.to_s) : number.to_f
end
def cast_binary data
DynamoDB::Binary.new(data)
end
def type_indicator(value, context)
case
when value.kind_of?(DynamoDB::Binary) then :b
when value.respond_to?(:to_str) then :s
when value.kind_of?(Numeric) then :n
when value.respond_to?(:each)
indicator = nil
value.each do |v|
member_indicator = type_indicator(v, context)
raise_error("nested collections", context) if
member_indicator.to_s.size > 1
raise_error("mixed types", context) if
indicator and member_indicator != indicator
indicator = member_indicator
end
indicator ||= :s
:"#{indicator}s"
when value == :empty_number_set
:ns
else
raise_error("unsupported attribute type #{value.class}", context)
end
end
def raise_error(msg, context)
msg = "#{msg} in #{context}" if context
raise ArgumentError, msg
end
end
end
end
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