Class: DeltaCore::Comparator

Inherits:
Object
  • Object
show all
Defined in:
lib/delta_core/comparator.rb

Constant Summary collapse

BUILT_IN_STRATEGIES = 
{
  quantity: Strategies::Quantity,
  replace: Strategies::Replace,
  merge: Strategies::Merge
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(snapshot_state, current_state, config) ⇒ Comparator

Returns a new instance of Comparator.



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# File 'lib/delta_core/comparator.rb', line 15

def initialize(snapshot_state, current_state, config)
  @snapshot_state = snapshot_state
  @current_state  = current_state
  @config         = config
end

Class Method Details

.compare(snapshot_state, current_state, config) ⇒ Object 



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# File 'lib/delta_core/comparator.rb', line 11

def self.compare(snapshot_state, current_state, config)
  new(snapshot_state, current_state, config).compare
end

Instance Method Details

#compare ⇒ Object 



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# File 'lib/delta_core/comparator.rb', line 21

def compare
  @config.mappings.reduce(DeltaResult.new) do |result, mapping|
    snap_coll = Array(@snapshot_state[mapping.name])
    curr_coll = Array(@current_state[mapping.name])

    strategy = resolve_strategy(mapping.strategy)
    raw      = strategy.call(snap_coll, curr_coll, mapping)
    partial  = DeltaResult.new(**raw)
    nested   = compare_nested(snap_coll, curr_coll, mapping)

    result.merge(partial).merge(nested)
  end
end