Class: Locomotive::RelationalAlgebra::SortList

Inherits:
Object
  • Object
show all
Includes:
XML
Defined in:
lib/locomotive/relational_algebra/operators/ranking/rank_lists.rb

Instance Method Summary collapse

Methods included from XML

included, #quote

Constructor Details

#initialize(hash) ⇒ SortList

Returns a new instance of SortList.



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# File 'lib/locomotive/relational_algebra/operators/ranking/rank_lists.rb', line 19

def initialize(hash)
  self.sort_list = hash
end

Instance Method Details

#attributes ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/ranking/rank_lists.rb', line 23

def attributes
  sort_list.keys
end

#clone ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/ranking/rank_lists.rb', line 38

def clone
   SortList.new( sort_list.clone )
end

#to_xml ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/ranking/rank_lists.rb', line 27

def to_xml
  pos = -1
  sort_list.collect do |attr, dir|
    column :name => attr.to_xml,
           :function => :sort,
           :position => pos += 1,
           :direction => dir.to_xml,
           :new => false
  end.join
end