Class: Locomotive::RelationalAlgebra::Error

Inherits:
Binary show all
Defined in:
lib/locomotive/relational_algebra/operators/error/error.rb

Instance Attribute Summary collapse

Attributes inherited from Operator

#schema

Attributes included from AstHelpers::AstNode

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

Instance Method Summary collapse

Methods inherited from Binary

#left_and_right

Methods inherited from Operator

#bound, #free, #to_xml, #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(op1, op2, item) ⇒ Error

Returns a new instance of Error.



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 9

def initialize(op1, op2, item)
  self.item = item
  super(op1, op2)
end

Dynamic Method Handling

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

Instance Attribute Details

#item ⇒ Object

Returns the value of attribute item.



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 6

def item
  @item
end

Instance Method Details

#clone ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 35

def clone
  Error.new(
    left.clone, right.clone,
    item.clone)
end

#left_and_right=(op1, op2) ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 14

def left_and_right=(op1, op2)
  unless op.schema.attributes?([item])
    raise CorruptedSchema,
          "Schema #{op.schema.attributes} does not " \
          "contain all attributes of #{item}."
  end

  # set the schema to its right child
  self.schema = op2.schema
end

#set(var, plan) ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 41

def set(var, plan)
  Error.new(
    left.set(var,plan),
    right.set(var.plan),
    item.clone)
end

#xml_content ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 29

def xml_content
  content do
    column :name => item.to_xml, :new => false
  end
end

#xml_kind ⇒ Object 



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# File 'lib/locomotive/relational_algebra/operators/error/error.rb', line 25

def xml_kind
  :error
end