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Versions: 5
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Contents
module Alf
module Engine
#
# Clips input tuples keeping (all but) specific attributes only.
#
# Example:
#
# operand = [
# {:name => "Jones", :city => "London"},
# {:name => "Smith", :city => "Paris"}
# ]
#
# Clip.new(operand, AttrList[:name], false).to_a
# # => [
# # {:name => "Jones"},
# # {:name => "Smith"}
# # ]
#
# Clip.new(operand, AttrList[:name], true).to_a
# # => [
# # {:city => "London"},
# # {:city => "Paris"}
# # ]
#
class Clip < Cog
# @return [Enumerable] The operand
attr_reader :operand
# @return [AttrList] List of attributes for clipping
attr_reader :attributes
# @return [Boolean] Clip *all but* attributes?
attr_reader :allbut
# Creates an Clip instance
def initialize(operand, attributes, allbut)
@operand = operand
@attributes = attributes
@allbut = allbut
end
# (see Cog#each)
def each
@operand.each do |tuple|
yield @attributes.project_tuple(tuple, @allbut)
end
end
end # class Clip
end # module Engine
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems