Class: Locomotive::RelationalAlgebra::Unary

Inherits:

Operator

• Object
• RelAlgAstNode
• Operator
• Locomotive::RelationalAlgebra::Unary

Defined in:

lib/locomotive/relational_algebra/operators/basic_operators.rb

Overview

An unary Operator has exactly one child

Direct Known Subclasses

Aggr, Attach, BinOp, Cast, Comparison, Distinct, Function, Not, Numbering, Project, Select

Instance Attribute Summary

Attributes inherited from Operator

#schema

Attributes included from AstHelpers::AstNode

#kind, #left_child, #owner, #right_child, #value

Instance Method Summary

• #initialize(op) ⇒ Unary constructor

  A new instance of Unary.

Methods inherited from Operator

#bound, #free, #to_xml, #xml_content, #xml_kind, #xml_schema

Methods included from XML

included, #quote, #to_xml

Methods included from AstHelpers::Annotations

#method_missing, #respond_to?

Methods included from AstHelpers::AstNode

#has_left_child?, #has_right_child?, #is_leaf?, #traverse, #traverse_strategy=

Constructor Details

#initialize(op) ⇒ Unary

Returns a new instance of Unary.

Raises:

• (AbstractClassError)

# File 'lib/locomotive/relational_algebra/operators/basic_operators.rb', line 105

def initialize(op)
  raise AbstractClassError,
        "#{self.class} is an abstract class" if self.class == Unary
  super()
  self.child = op
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Locomotive::AstHelpers::Annotations