Class: Locomotive::RelationalAlgebra::BinOp

Inherits:
Unary show all
Defined in:
lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb

Direct Known Subclasses

And, Or

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 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(op, res, items) ⇒ BinOp

Returns a new instance of BinOp.



11
12
13
14
15
16
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 11

def initialize(op, res, items)
  self.res,
  self.item1,
  self.item2 = res, items[0], items[1]
  super(op)
end

Dynamic Method Handling

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

Instance Attribute Details

#item1 ⇒ Object

Returns the value of attribute item1.



6
7
8
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 6

def item1
  @item1
end

#item2 ⇒ Object

Returns the value of attribute item2.



6
7
8
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 6

def item2
  @item2
end

#res ⇒ Object

Returns the value of attribute res.



6
7
8
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 6

def res
  @res
end

Instance Method Details

#child=(op) ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 18

def child=(op)
  unless op.schema.attributes?([item1])
    raise CorruptedSchema,
          "Schema #{op.schema.attributes} does not " \
          "contain all attributes of #{item1}."
  end
  unless op.schema.attributes?([item2])
    raise CorruptedSchema,
          "Schema #{op.schema.attributes} does not " \
          "contain all attributes of #{item2}."
  end
    
  self.schema = op.schema +
           Schema.new({ res => [RBool.instance] })
    
  super(op)
end

#clone ⇒ Object 



48
49
50
51
52
53
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 48

def clone
  self.class.new(child.clone,
                 res.clone,
                 item1.clone,
                 item2.clone)
end

#set(var, plan) ⇒ Object 



55
56
57
58
59
60
61
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 55

def set(var, plan)
  self.class.new(
    child.set(var,plan),
    res.clone,
    item1.clone,
    item2.clone)
end

#xml_content ⇒ Object 



36
37
38
39
40
41
42
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 36

def xml_content
  content do
    [column(:name => res.to_xml, :new => true),
     column(:name => item1.to_xml, :new => false, :position => 1),
     column(:name => item2.to_xml, :new => false, :position => 2)].join
  end
end

#xml_kind ⇒ Object 



44
45
46
 
# File 'lib/locomotive/relational_algebra/operators/boolean/basic_boolean.rb', line 44

def xml_kind
  self.class.to_s.split('::').last.downcase.to_sym
end