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Contents
module Alf
module Engine
#
# Implement an in-memory sort, relying on `to_a.sort!`
#
# Example:
#
# rel = [
# {:name => "Smith"},
# {:name => "Jones"}
# ]
# Sort.new(rel, Ordering[[:name, :asc]]).to_a
# # => [
# # {:name => "Jones"}
# # {:name => "Smith"},
# # ]
#
class Sort::InMemory
include Sort
include Cog
# @return [Enumerable] The operand
attr_reader :operand
# @return [Ordering] The ordering info
attr_reader :ordering
# Creates an Autonum instance
def initialize(operand, ordering, expr = nil, compiler = nil)
super(expr, compiler)
@operand = operand
@ordering = ordering
end
# (see Cog#cog_orders)
def cog_orders
@cog_orders ||= [ ordering ]
end
# (see Cog#each)
def _each(&block)
operand.to_a.sort!(&ordering.sorter).each(&block)
end
def arguments
[ ordering ]
end
end # class Sort::InMemory
end # module Engine
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems