Class: NcsNavigator::Mdes::Differences::Entry

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/ncs_navigator/mdes/differences/entry.rb

Overview

Captures the differences between two instances of one of the elements that makes up a specification. I.e., TransmissionTable, Variable, VariableType, or CodeListEntry.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#attribute_differences ⇒ Hash<Symbol, Object>

Return the differences for each attribute. Each key is the name of the attribute and each value is an object describing the difference. It might be a Value diff, a Collection diff, or another NcsNavigator::Mdes::Differences::Entry diff depending on the kind of attribute.



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# File 'lib/ncs_navigator/mdes/differences/entry.rb', line 42

def attribute_differences
  @attribute_differences ||= {}
end

Class Method Details

.compute(o1, o2, attribute_criteria, diff_options) ⇒ Entry? 



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# File 'lib/ncs_navigator/mdes/differences/entry.rb', line 17

def self.compute(o1, o2, attribute_criteria, diff_options)
  differences = attribute_criteria.each_with_object({}) do |(diff_attribute, criterion), diffs|
    o_attribute = (criterion.respond_to?(:attribute) && criterion.attribute) || diff_attribute
    d = criterion.apply(o1.send(o_attribute), o2.send(o_attribute), diff_options)
    diffs[diff_attribute] = d if d
  end

  if differences.empty?
    nil
  else
    Entry.new.tap { |e| e.attribute_differences = differences }
  end
end