Class: Metamorphosis::UnitValue

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/metamorphosis/unit_value.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(unit_symbol, value, exponent = 1.0) ⇒ UnitValue

Returns a new instance of UnitValue.



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# File 'lib/metamorphosis/unit_value.rb', line 7

def initialize(unit_symbol, value, exponent = 1.0)
  @unit_symbol = unit_symbol.to_sym
  @value = value
  @exponent = exponent.to_f
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/metamorphosis/unit_value.rb', line 48

def method_missing method_name, *args, &block
  self.to(method_name) ||
    super( method_name, *args, &block )
end

Instance Attribute Details

#exponent ⇒ Object (readonly)

Returns the value of attribute exponent.



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# File 'lib/metamorphosis/unit_value.rb', line 5

def exponent
  @exponent
end

#unit_symbol ⇒ Object (readonly)

Returns the value of attribute unit_symbol.



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# File 'lib/metamorphosis/unit_value.rb', line 5

def unit_symbol
  @unit_symbol
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/metamorphosis/unit_value.rb', line 5

def value
  @value
end

Instance Method Details

#<=>(other_unit) ⇒ Object 



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# File 'lib/metamorphosis/unit_value.rb', line 25

def <=>(other_unit)
  unless other_unit.is_a?(UnitValue) || other_unit.is_a?(Numeric)
    raise ArgumentError,
          "Unable to compare #{self.to_s} with #{other_unit.class}"
  end

  # Assume numeric values are of the same unit type
  return self.to_f <=> other_unit if other_unit.is_a?(Numeric)

  # Convert the unit if they're not the same unit already
  unless @unit_symbol == other_unit.unit_symbol
    other_unit = other_unit.to(@unit_symbol)
  end

  self.to_f <=> other_unit.to_f
end

#to(unit_symbol = nil) ⇒ Object Also known as: as 



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# File 'lib/metamorphosis/unit_value.rb', line 42

def to(unit_symbol = nil)
  return self unless unit_symbol
  Metamorphosis.engine.convert_to(unit_symbol, self)
end

#to_f ⇒ Object 



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# File 'lib/metamorphosis/unit_value.rb', line 17

def to_f
  @exponent * @value
end

#to_i ⇒ Object 



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# File 'lib/metamorphosis/unit_value.rb', line 21

def to_i
  to_f.to_i
end

#to_s ⇒ Object 



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# File 'lib/metamorphosis/unit_value.rb', line 13

def to_s
  "#{self.to_f} #{unit_symbol}"
end