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response.rb
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response.rb
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module AmazonAssociate
# Response object returned after a REST call to Amazon service.
class Response
attr_accessor :request_url, :unsigned_url
# XML input is in string format
def initialize(xml, request_url)
@doc = Hpricot(xml)
@items = nil
@item_page = nil
@total_results = nil
@total_pages = nil
self.request_url = request_url
end
# Return Hpricot object.
def doc
@doc
end
# Return true if request is valid.
def is_valid_request?
(@doc/"isvalid").inner_html == "True"
end
# Return true if response has an error.
def has_error?
!(error.nil? || error.empty?)
end
# Return error message.
def error
Element.get(@doc, "error/message")
end
# Return an array of AmazonAssociate::Element item objects.
def items
unless @items
@items = (@doc/"item").collect {|item| Element.new(item)}
end
@items
end
# Return the first item (AmazonAssociate::Element)
def first_item
items.first
end
# Return current page no if :item_page option is when initiating the request.
def item_page
unless @item_page
@item_page = (@doc/"itemsearchrequest/itempage").inner_html.to_i
end
@item_page
end
# Return total results.
def total_results
unless @total_results
@total_results = (@doc/"totalresults").inner_html.to_i
end
@total_results
end
# Return total pages.
def total_pages
unless @total_pages
@total_pages = (@doc/"totalpages").inner_html.to_i
end
@total_pages
end
end
end