Class: Differential::Calculator::Item

Inherits:
Object
  • Object
show all
Includes:
HasTotals, Side
Defined in:
lib/differential/calculator/item.rb

Overview

Consider this as being line-level and is the lowest point of calculation. Ultimately a Report object will turn all added Record objects into Item objects (placed in Group objects.)

Constant Summary

Constants included from Side

Side::A, Side::B

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from HasTotals

#totals

Constructor Details

#initialize(id) ⇒ Item

Returns a new instance of Item.

Raises:

  • (ArgumentError) 


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# File 'lib/differential/calculator/item.rb', line 21

def initialize(id)
  raise ArgumentError, 'id is required' unless id

  @id         = id
  @a_records  = []
  @b_records  = []
end

Instance Attribute Details

#a_records ⇒ Object (readonly)

Returns the value of attribute a_records.



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# File 'lib/differential/calculator/item.rb', line 19

def a_records
  @a_records
end

#b_records ⇒ Object (readonly)

Returns the value of attribute b_records.



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# File 'lib/differential/calculator/item.rb', line 19

def b_records
  @b_records
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/differential/calculator/item.rb', line 19

def id
  @id
end

Instance Method Details

#add(record, side) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/differential/calculator/item.rb', line 29

def add(record, side)
  raise ArgumentError, 'record is required' unless record
  raise ArgumentError, 'side is required'   unless side
  raise ArgumentError, "mismatch: #{record.id} != #{id}" if id != record.id

  totals.add(record.value, side)

  (record, side)

  self
end