Class: Amor::Constraint

Inherits:
Object
  • Object
show all
Defined in:
lib/amor/constraint.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lhs, relation, rhs) ⇒ Constraint

Returns a new instance of Constraint.



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# File 'lib/amor/constraint.rb', line 6

def initialize(lhs, relation, rhs)
  @lhs = Expression.new(lhs)
  @rhs = Expression.new(rhs)
  @relation = relation
end

Instance Attribute Details

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/amor/constraint.rb', line 4

def index
  @index
end

#lhs ⇒ Object (readonly)

Returns the value of attribute lhs.



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# File 'lib/amor/constraint.rb', line 3

def lhs
  @lhs
end

#relation ⇒ Object (readonly)

Returns the value of attribute relation.



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# File 'lib/amor/constraint.rb', line 3

def relation
  @relation
end

#rhs ⇒ Object (readonly)

Returns the value of attribute rhs.



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# File 'lib/amor/constraint.rb', line 3

def rhs
  @rhs
end

Instance Method Details

#lp_name ⇒ Object 



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# File 'lib/amor/constraint.rb', line 26

def lp_name
  "c#{index+1}"
end

#lp_string ⇒ Object 



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# File 'lib/amor/constraint.rb', line 12

def lp_string
  temp_lhs = (@lhs - @rhs).simplified
  relation_string = case @relation
    when :greater_equal
      ">="
    when :lesser_equal
      "<="
    else
      "="
    end

  "#{lp_name}: #{temp_lhs.remove_constants.lp_string} #{relation_string} #{-temp_lhs.constant_factor}"
end

#to_s ⇒ Object 



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# File 'lib/amor/constraint.rb', line 30

def to_s
  relation_string = case @relation
    when :greater_equal
      ">="
    when :lesser_equal
      "<="
    else
      "=="
    end
  "#{@lhs} #{relation_string} #{@rhs}"
end