Class: Alf::Engine::Rank::Cesure

Inherits:
Object
  • Object
show all
Includes:
Cesure, Alf::Engine::Rank
Defined in:
lib/alf/engine/rank/cesure.rb

Constant Summary

Constants included from Cog

Cog::EMPTY_CHILDREN, Cog::EMPTY_OPTIONS

Instance Attribute Summary collapse

Attributes included from Compiler::Cog

#compiler, #expr

Instance Method Summary collapse

Methods included from Cesure

#each

Methods included from Cog

#children, #each, #options, #to_s

Methods included from Compiler::Cog

#cog_orders, #orderedby?, #relation_type, #to_ascii_tree, #to_cog, #to_relation

Constructor Details

#initialize(operand, by, as, expr = nil, compiler = nil) ⇒ Cesure

Creates an Rank::Cesure instance



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# File 'lib/alf/engine/rank/cesure.rb', line 17

def initialize(operand, by, as, expr = nil, compiler = nil)
  super(expr, compiler)
  @operand = operand
  @by = by.to_attr_list
  @as = as
end

Instance Attribute Details

#as ⇒ AttrName (readonly)

Returns Name of the introduced attribute.

Returns:

  • (AttrName) —

    Name of the introduced attribute



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# File 'lib/alf/engine/rank/cesure.rb', line 14

def as
  @as
end

#by ⇒ AttrList (readonly)

Returns List of attributes that form the operand ordering.

Returns:

  • (AttrList) —

    List of attributes that form the operand ordering



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# File 'lib/alf/engine/rank/cesure.rb', line 11

def by
  @by
end

#operand ⇒ Enumerable (readonly)

Returns The operand.

Returns:

  • (Enumerable) —

    The operand



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# File 'lib/alf/engine/rank/cesure.rb', line 8

def operand
  @operand
end

Instance Method Details

#arguments ⇒ Object 



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# File 'lib/alf/engine/rank/cesure.rb', line 24

def arguments
  [ by, as ]
end