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# frozen_string_literal: true
require 'jmespath'
module Aws
# @api private
class Pager
# @option options [required, Hash<JMESPath,JMESPath>] :tokens
# @option options [String<JMESPath>] :limit_key
# @option options [String<JMESPath>] :more_results
def initialize(options)
@tokens = options.fetch(:tokens)
@limit_key = options.fetch(:limit_key, nil)
@more_results = options.fetch(:more_results, nil)
end
# @return [Symbol, nil]
attr_reader :limit_key
# @param [Seahorse::Client::Response] response
# @return [Hash]
def next_tokens(response)
@tokens.each.with_object({}) do |(source, target), next_tokens|
value = JMESPath.search(source, response.data)
next_tokens[target.to_sym] = value unless empty_value?(value)
end
end
# @api private
def prev_tokens(response)
@tokens.each.with_object({}) do |(_, target), tokens|
value = JMESPath.search(target, response.context.params)
tokens[target.to_sym] = value unless empty_value?(value)
end
end
# @param [Seahorse::Client::Response] response
# @return [Boolean]
def truncated?(response)
if @more_results
JMESPath.search(@more_results, response.data)
else
next_t = next_tokens(response)
prev_t = prev_tokens(response)
!(next_t.empty? || next_t == prev_t)
end
end
private
def empty_value?(value)
value.nil? || value == '' || value == [] || value == {}
end
class NullPager
# @return [nil]
attr_reader :limit_key
def next_tokens
{}
end
def prev_tokens
{}
end
def truncated?(response)
false
end
end
end
end
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