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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
class SimpleDB
# Holds the data for a SimpleDB item. While {Item} only proxies
# requests to return data, this class actually stores data
# returned by a query. For example, you can use this to get the
# list of items whose titles are palindromes using only a single
# request to SimpleDB (not counting pagination):
#
# items.enum_for(:select).
# select { |data| data.title == data.title.to_s.reverse }.
# map { |data| data.item }
#
# The {ItemCollection#select} call yields instances of ItemData,
# and the `map` call in the example above gets the list of
# corresponding {Item} instances.
class ItemData
# @api private
def initialize(opts = {})
@name = opts[:name]
@attributes = opts[:attributes]
@domain = opts[:domain]
if obj = opts[:response_object]
@name ||= obj[:name]
if obj[:attributes]
@attributes ||= begin
attributes = {}
obj[:attributes].each do |attr|
attributes[attr[:name]] ||= []
attributes[attr[:name]] << attr[:value]
end
attributes
end
end
end
end
# @return [String] The item name.
attr_reader :name
# @return [Hash] A hash of attribute names to arrays of values.
attr_reader :attributes
# @return [Domain] The domain from which the item data was retrieved.
attr_reader :domain
# Returns the {Item} corresponding to this ItemData; you can
# use this to perform further operations on the item, or to
# fetch its most recent data.
# @return [Item] The item this data belongs to.
def item
domain.items[name]
end
end
end
end
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