Class: Brujula::Mergers::MapObjectMerger

Inherits:
Object
  • Object
show all
Defined in:
lib/brujula/mergers/map_object_merger.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(instance:, superinstance:) ⇒ MapObjectMerger

Returns a new instance of MapObjectMerger.



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# File 'lib/brujula/mergers/map_object_merger.rb', line 6

def initialize(instance:, superinstance:)
  @superinstance = superinstance
  @instance      = instance
end

Instance Attribute Details

#instance ⇒ Object (readonly)

Returns the value of attribute instance.



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# File 'lib/brujula/mergers/map_object_merger.rb', line 4

def instance
  @instance
end

#superinstance ⇒ Object (readonly)

Returns the value of attribute superinstance.



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# File 'lib/brujula/mergers/map_object_merger.rb', line 4

def superinstance
  @superinstance
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/brujula/mergers/map_object_merger.rb', line 11

def call
  return superinstance.dup if instance.nil?

  instance.dup.tap do |extended_instance|
    each_inheritable_items do |inherit_item|
      extended_instance.merge(inherit_item.name, inherit_item)
    end
  end
end

#each_inheritable_items ⇒ Object 



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# File 'lib/brujula/mergers/map_object_merger.rb', line 21

def each_inheritable_items
  superinstance.each do |inherit_item|

    merge_item = case item_reference(inherit_item.name)
    when :optional_to_optional
      instance.fetch(inherit_item.name)
    when :optional
      instance.fetch(inherit_item.name.gsub(/\?$/, ''))
    when :direct
      instance.key?(inherit_item.name) ?
        instance.fetch(inherit_item.name) : nil
    else
      next
    end

    yield merger(merge_item, inherit_item)
  end
end

#instance_has_item?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brujula/mergers/map_object_merger.rb', line 65

def instance_has_item?(key)
  item_names.include?(key.gsub(/\?$/, ''))
end

#instance_has_optional_item?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brujula/mergers/map_object_merger.rb', line 69

def instance_has_optional_item?(key)
  item_names.include?(key)
end

#item_names ⇒ Object 



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# File 'lib/brujula/mergers/map_object_merger.rb', line 73

def item_names
  @item_names ||= instance.to_a.map(&:name)
end

#item_reference(key) ⇒ Object 



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# File 'lib/brujula/mergers/map_object_merger.rb', line 44

def item_reference(key)
  case
  when optional_key?(key) && instance_has_optional_item?(key)
    :optional_to_optional
  when optional_key?(key) && instance_has_item?(key)
    :optional
  when !optional_key?(key)
    :direct
  end
end

#merge_item?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brujula/mergers/map_object_merger.rb', line 55

def merge_item?(key)
  return true unless optional_key?(key)

  instance_has_item?(key) || instance_has_optional_item?(key)
end

#merger(merge_item, inherit_item) ⇒ Object 



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# File 'lib/brujula/mergers/map_object_merger.rb', line 40

def merger(merge_item, inherit_item)
  Merger.new(instance: merge_item, superinstance: inherit_item).call
end

#optional_key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brujula/mergers/map_object_merger.rb', line 61

def optional_key?(key)
  key.to_s.end_with?('?')
end